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, U.S.N.M.) 



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 of ascidians common to the West Indies and Malay region 

 are, however, already known, and in this case the resemblance be- 

 tween specimens from Bermuda and those from the Philippines is 

 certainly very close. 



LEPTOCLINUM CALIFICIFORME Slniter, 1909. 

 Plate 31, fig. 35. 

 1909. Leptoclmum calificiforme Sluiteb Sf&o^u-Exped., vol. 56b, p. 82, pi. 

 4, fig. 10. (Called L. caliciforme on p. 112.) 



Colony flattened, slightly depressed in the central portion, and of 

 irregular outline; the margins slightly elevated. Largest specimen 

 about 22 mm. in greatest diameter and hardlv over 2 mm. thick on an 



