70 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Digestive tract forming a small, short, but proportionately broad 

 loop. Stomach elongated, of small diameter; a part of its wall is 

 thrown into somewhat irregular glandular folds of a greenish color. 

 Rectum long; margin of anus thin, not distinctly lobed. 



Kidney small, sausage-shaped, and considerably curved with the 

 concavity dorsal; attached to the. mantle on the posterior ventral 

 part of the right side. 



A gonad is present on each side, that on the left side within the 

 intestinal loop, that on the right just dorsal to the kidney. Gonads 

 each consisting of an elongate ovary which is curved in a spiral 

 of more than a complete turn, bordered and overlapped along its 

 outer margin by the numerous small testes, the latter often cleft into 

 two or three lobes. The free end of the ovary is not produced into 

 an oviduct. The sperm ducts extend from the testes toward the 

 center of the spiral formed by the ovary; they lie upon the free 

 surface of the latter. The individual ducts end near the center of the 

 gonad, often after uniting with the ducts of several adjacent testes. 

 The structure of the gonad evidently resembles that described as 

 characteristic of the genus Gamaster Pizon, 1896, but in that genus 

 the branchial folds and the left gonad are wanting. 



This is a deep-water form collected only at the two following 

 stations: 



No. 54. 1 Station D5536 (between Negros and Siquijor, N. lat 9° 15' 45"; 



E. long. 123° 22', 279 fathoms, green mud, August 19, 1909). 



Two specimens. (Cat. No. 5921, U.S.N.M.) 

 No. 60. Station D5608 (Gulf of Tomini, Celebes, S. lat. 0° 08' ; B. long. 



121° 19'; 1,089 fathoms, gray mud, November 16, 1909). Three 



specimens. (Cat. No. 5920, U.S.N.M.) 



The writer feels no hesitation in identifying these specimens with 

 Sluiter's species, described from latitude 5° 26' 36" S. ; longitude 

 132° 32' 30" E., 397 meters. Molgula pellucida MacDonald (1859<?, 

 p. 369, -pi. 64, div. Ill, figs. 1-4) from Shark Bay, Australia, agrees 

 with the present species in many characters external and internal, 

 but, judging from his figures, the ovaries have a stout, flask-shaped 

 outline instead of the tubular spirally curved form of the present 

 species. Molgula japonica Hartmeyer, 1906, from Japan also agrees 

 with the present species in many characters, including the position of 

 the left gonad, but the gonads are described as long and club-shaped, 

 and the intestine forms a long open loop. 



Family TETHYIDAE Huntsman, 1912. 



[CYNTHIIDAE, HALOCYNTHIIDAE, 9. PYURIDAE Authors.] 



Not Tethyidae Hartmeyer, 1908 and 1909 (=Styelidae of this 

 paper). 



1 Number of the specimen or lot. 



