138 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Stigmata apparently in three rows (possibly four) ; probably 18 or 

 20 in a row on each side. 



Stomach rounded, smooth-walled. Intestinal loop twisted so as 

 to bring the stomach to the posterior side. 



Many of the zooids contain large embryos in the ventral region 

 of the thorax and anterior part of the abdomen and large eggs 

 farther back in the ventral region. The ovary itself, containing a 

 small group of eggs of different sizes, is situated beside the in- 

 testinal loop, where the testes are also situated; the latter are few in 

 number, pear-shaped, and placed radially in a group. The sperm 

 duct arises from the center of the group of testes and passes to the 

 intestine, extending along it into the thorax. An oviduct was not 

 demonstrated. 



Localities for this species : 



No. 63. Station D5163 (off Observation Island, Tawi Tawi Group, Sulu 

 Archipelago, Feb. 24, 190S, 2S fathoms, coral sand). One colony. 



No. 62. Station D5168 (off Observation Island, Feb. 25, 1908, SO fathoms, 

 coral sand). Several colonies (Cat. No. 5960, U.S.N.M.). 



Sluiter (1909) described the species from a reef at Haingsisi. 

 Genus CYSTODITES von Drasche, 1883. 



CYSTODITES PHILIPPINENSIS Herdman, 1886. 



Plate 28, fig. 15. 



1886. Cystodytes philippinensis Herdman, Rep. Voy. Challenger, vol. 14, 

 Tunicata, p. 140, pi. 20, figs. 1 and 2. 



1S91. Cystodytes philippinensis Herdman, Journ. Linn. Soc. London. Zool., 

 vol. 23, p. 615. 



1S93-1907. Cystodites philippinensis Seeliger, Bronn's Tier-reich, vol. 3, 

 suppl., pi. 14, fig. 14. 



1906. Cystodites philippinensis Herdman, Rep. Ceylon Pearl Oyster Fish- 

 eries, pt. 5, p. 334. 



1909. Cystodites philippinensis Si/uiter, Sifroj/a-Exped., vol. 56&, pp. 28, 30. 

 28. 30. 



1909. Cystodites philippinensis Caullery, Bull. Sci. France Belgique, vol. 

 42. p. 45. 



1909. Cystodites philippinensis Hartmeyer. Bronn's Tier-reich, vol. 3, 

 suppl., p. 1434. 



Colon}'- flat and rather thin, generally quite uniform in thickness, 

 with the zcoids evenly but not very thickly distributed, each zooid 

 when contracted being surrounded by a calcareous capsule. This 

 capsule is very dense and firm and is formed of overlapping shield- 

 shaped calcareous spicules which mostly measure from 0.20 to 0.38 

 mm. in diameter. These capsules show more or less plainly through 

 the semitransparent test; the latter is of a light brown color, due 

 in part to diffused color and in part to brown pigment cells dis- 

 tributed chiefly in the upper layers. There are also deposits of ir- 



