. Bulletin - United States National Museum. Science. 160 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. Much time and labor was expended in an attempt to demonstrate the dorsal languets, and it is believed that they were distinctly seen in several cases. The difficulty in distinguishing them is apparently due to their being long and slender and not greatly different in thickness from the interstigmatic vessels. Apparently they arise as usual from the transverse vessels of the left side, but quite near the median dorsal vessel. Branchial sac with four rows of long narrow sigmata, apparently about
. Bulletin - United States National Museum. Science. 160 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. Much time and labor was expended in an attempt to demonstrate the dorsal languets, and it is believed that they were distinctly seen in several cases. The difficulty in distinguishing them is apparently due to their being long and slender and not greatly different in thickness from the interstigmatic vessels. Apparently they arise as usual from the transverse vessels of the left side, but quite near the median dorsal vessel. Branchial sac with four rows of long narrow sigmata, apparently about 12 or 14 in a row on each side. Esophagus long; stomach oval, somewhat larger at the cardiac end. Intestinal loop rather large, bent to one side, and more or less twisted. It has several valvelike constrictions. Testes beside the intestinal loop; two in number, of oval form, connected with the origin of the common sperm duct (which is not spirally coiled) by very short branch ducts. Ovary situated along the initial part of the common sperm duct. Eggs mostly in a single series; the largest and most advanced in the posterior part. Localities of the specimens above mentioned:. Fig. 109.—Leptocli- num macdonaldi (Herdman). Zooid. X 42. No. 78. Station D5145 (near Jolo Light, Feb. 15, 1908, 23 fathoms, coral sand and shells), (Cat. No. 5957, ) No. 162. Station D5148 (off Sirun Island, Sulu Ar- chipelago, Feb. 16, 1908, 17 fathoms, coral sand). Leptoclinum macdonaldi was described by Herdman (1886) from a specimen obtained by the Challenger expedition at Bahia, Brazil, in shallow water, and what appears to be the same species has also been found at Bermuda (Van Name, 1902). Gottschaldt (1898) re- cords a colony from Ternate agreeing with Herdman's species. The widely separated localities are, of course, against the probability of their identity and naturally lead to the suspicion that with more abundant and better material specific differences might be discovered. A number
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