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BE ace a a oa > a Th ate : @ em e 5: » , = wage 43 = ‘a 7 os: M eo irae < ; eey = oo hy) 5 7 - * he ° eens Sle SMITHSON AA, A UY ZU0Y LIBRARIES OM ld a [From the San Francisco ‘‘ Mining and Scientific Press,’ August 9, 1873.] Description of a New Species of Alcyonoid Polyp. BY ROBERT E. C. STEARNS. At a meeting of the California Academy of Sciences, held on the third day of February, 1873, a paper was read by me, entitled “ Remarks on a New Alcyo- noid Polyp, from Burrard’s Inlet;” * in which I gave a resumé of the discus- sions, notices, ete., in this country and in England, arising from the examination by several naturalists, of certain “switch’-like forms, which had been received by different parties from the Gulf of Georgia (more particularly from Burrard’s Inlet, in said gulf); several specimens of said “ switches” being in the Museuin of the California Academy. . These “ switches,” or rods, were referred by Dr. Gray, of the British Museum, to his genus “ Osteocella,” and by Mr. Sclater’s correspondent stated to belong to “a sort of fish ;” but by the majority of scientific gentlemen who had seen these “switches” they were regarded as belonging to a species of Alcyonoid Polyp. I expressed the belief that they belonged to a species of Umbellularia. Ata meeting of the California Academy, held on the evening of August 4, 1873, Dr. James Blake presented a specimen of the polyp of which these so- called switches are the axes, which had been sent to him from the Gulf of Georgia by his friend, Capt. Doane. This specimen was one of six or seven sent at the same time, all of which were in a tolerable state of preservation, though, as might have been anticipated, the more delicate tissues of the polyps are somewhat decomposed, and some of the specimens are in some places lacer- ated. They all are, however, sufficiently perfect to determine the true position, and show that the “switches” are, as was supposed, the supporting stalks or axes of an Alcyonoid Polyp “ related or pertaining to the group Pennatulide.” On the day after the meeting of the Academy (August 5), through the court- esy of Dr. Blake, I was invited to inspect the other specimens, and from said examination have written the following description : Genus Pavonarta, Cuvier. Pavonaria Blakei; n. s. Polyp-mass or polypidom, of a flesh or pink color, linear, elongate, attenuate ; polypiferous portion about three fourths of the entire length, rounded oval to ovate elliptic in cross section, and from three fourths to one inch in greatest di- * Vide Proceed. Cal. Acad. Sciences, Vol. V., Part I., pp. 7-12. 2 ameter, flatly tapering toward the tip, as well as decreasing in the opposite direction to where the polypiferous rows terminate or become obsolete. From this latter point to the beginning of the base or root, a portion of the polypi- dom, equal to about one sixth of its entire length, is quite slender, being only about twice the diameter of the naked axis, and the surface quite smooth ; said portion, as well as the base, is round (in cross section) ; the basal part is from one ninth to one eleventh of the entire length, and about one inch in diameter, with the surface longitudinally wrinkled or contracted, presenting a ridged or fibrous appearance. Style or axis long, slender, white, hard, bony, somewhat polished, about three sixteenths (3-16) of an inch in diameter in the thickest part, tapering gradually toward the tip, and attenuated, with surface somewhat roughened toward the basal extremity. Inclosed in the polyp-mass or polypidom, the axis is central from the base to where the polyp-rows begin, when it soon becomes marginal or lateral, forming a prominent rounded edge (free from polyps) on one side of the polypiferous portion of the whole. From near the sides of the axial edge the polyp-rows start, and run obliquely upward to the opposite side, where they nearly or quite meet, presenting, when that side is observed from above, a con- centric chevron or A-like arrangement. The more conspicuous polyp-rows show from nine to fourteen polyps, with occasional intermediate rows of three or more polyps. The length of the most perfect of Dr. Blake’s specimens was sixty-six (66) inches ; of which, commencing at the tip, a length of forty-eight and a quarter (4814) inches was occupied by the polyp-rows, which numbered two hundred and forty-five (245), or twice that number when both sides or arms of the chev- ron or A are considered. The number of polyps in each row was, in this speci- men, from eight (8) to eleven (11), with occasional intermediate shorter rows of from three (3) to seven (7). Hstimating ten to the row, this specimen exhibited about five thousand polyps, all of which, as well as the polyps in the other speci- mens, were filled with diminutive ova, of an orange color. In the next section of this specimen, the length between the last polyp-row and ihe swell of the base or root, is eleven and one quarter (1114) inches ; thence to the termination of the base, six (6) inches. The average dimensions of thirty-six (36) of the axes in the Museum of the California Academy is five feet six and one third inches in length, and the diam- eter or the largest, nine thirty-seconds of an inch; diameter of smallest speci- men, one sixteenth of an inch. In connection with the above description, some allowance should be made for the contraction and injury of the tissues by the alcohol in which the specimens were placed after they reached this city. Additional specimens of the above species, from the same locality, have been received from J 8. Lawson, Esq., U.S. Coast Survey, by George Davidson, Ksq., President of the Academy. 9 9) Appenpa.—Of the specimens received from Mr. Lawson, some individuals are younger than either of Dr. Blake’s. In these the polyp-rows are farther apart, and there are not so many polyps in the row ; neither do the ends of the rows approximate so closely on the side opposite the axial edge ; the polyps being not nearly so many in the same length, or presenting (as do some of Dr. Blake's specimens) so crowded an.appearance. In cross-section through the polypiferous portions, the younger individuals are less ovate or acutely oval than in the older specimens. 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