88 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



before the last internal longitudinal vessel is reached). The follow- 

 ing is their arrangement on the right side : 



dorsal 4 (11) 3 (10) 4 (13) 3 (G) 4 ventral. 



The stigmata are mostly quite long and narrow. 



Stomach short and broad, with 20 or more distinct longitudinal 

 folds. The intestine forms a narrow strong bent loop bending and 

 extending forward after leaving the stomach, then doubling back 

 so as to pass along close to the border of the stomach and turning 

 abruptly forward to form the rectum, which is long and has a deeply 

 lobed aperture. 



Two gonads on the left and three on the right side. They have 

 the form of stout, somewhat crooked tubes and are placed with their 

 dorsal ends (where the orifice is situated) pointing toward the base 

 of the atrial tube. They are well distended with eggs, which occupy 

 the unattached side of the gonad (that next to the branchial sac), 

 the testes, which are small and of simple or somewhat lobed form, 

 being crowded to the part next to the mantle. The individual sperm 

 ducts extend around on to the free side of the ovary and unite there 

 in the usual manner to form the common sperm duct, which opens 

 with a two-lipped orifice on a papilla beside the neck of the ovary. 



Collected at two localities: 



No. S8. Station D5147(off Sirun Island, Sulu Archipelago, 21 fathoms, coral 

 sand and shells, February 16, 1008). One large individual with a 

 very small and immature one attached to its base. (Cat. No. 5030, 

 U.S.N.M.) 



No. 80. Station D5163 (off Observation Island, Tawi Tawi Group, Sulu 

 Archipelago. February 24, 100S, 28 fathoms, coral sand). A 

 fairly large (22 mm. long) specimen, apparently adult, but with- 

 out gonads (Cat. No. 5920 U.S.N.M.). 



There can hardly be a doubt of the identity of these specimens 

 with those from Ceylon (greatest depth 20 fathoms) referred by 

 Herdman (190G) to Heller's species. The Philippine specimen on 

 which the description here given is based has fewer gonads on the 

 right side ; the usual number of gonads, according to Herdman, being 

 1 or 2 on the left and 4 to 6 on the right side. Heller's (1878) type 

 was also from Ceylon. This species is doubtfully distinct from 

 Styela plicata Lesueur, 1823, a large species widely distributed in 

 the warmer parts of the world. See Traustedt, 1883. 



STYELA TINAKTAE, new species. 

 Plate 32, fig. 40. 



Body rather elongate and somewhat curved, considerably flattened 

 from side to side, and attached in an oblique position by the left 

 posterior part. Apertures slightly prominent, small, both 4-lobed; 



