198 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



MATERIAL EXAMINED 



Japan : Honshu Island; off Suno Saki N. 89° K., 8.75 mi.; Albatross sta. 3745, 

 One specimen 45 mm. in length (USNM 11771). — Kyushu Island; Nagasaki; 

 E. S. Morse, coll. One swcimen 25 mm. in length (USNM 11701). 



Description. — Two specimens from Japanese waters were examined, 

 one 25 mm., the other 45 mm. in length. JMantle body of smaller speci- 

 men quite mutilated; however dorsal ridge connecting both apertures, 

 characteristic for present species, is preserved perfectly. It is 19 mm. 

 long, furnished with many irregularly formed protuberances. In 

 larger specimen dorsal ridge made rather obsolete by finger-shaped 

 protuberances on test surface, also by contraction of animal. Test 

 cartilaginous, yellowish white, attains 4 mm. thickness in some places. 

 Inner surface of mantle and surface of aliment aiy organs and gonads 

 covered with minute finger-shaped protuberances, larger on inner sur- 

 face of mantle than on surface of other organs. Also many compli- 

 catedly horn-shaped spinules embedded in inner surface layer of man- 

 tle, gonads, intestine, ciliated groove, tentacles and most abundantly 

 in larger vessels of branchial sac. They are glistening brownish gold ; 

 vary considerably in size, medium-sized, usually 250-300/u, in length. 

 Six folds on each side of branchial sac; inner longitudinal vessels 

 arranged (D= dorsal, V= ventral) : 



Left D 4 (23) 2 (26) 3 (2G) 4 (23) 3 (21) 4 (15) 5 V 



Right D 5 (24) 2 (27) 3 (2S) 4 (23) 4 (21) 4 (20) 7 V 



Transverse vessels arranged : thick thin medium thin thick, every in- 

 terval being intervened by parastigmatic vessels. Very delicate sec- 

 ondary parastigmatic vessels may be found in some places. About 

 10 elongated stigmata in each mesh. Right gonad consists of 20 genital 

 capsules, in left only 6 capsules in the 45 mm. long specimen. 



10.3. Pyura lepidoderma Tokioka 



FiGUKE 87 



Pynra lepidoderma Tokioka, lJ>49a, p. 10, pi. 5, figs. 1-3.— Tokioka. 19531). p. 19, 

 fig. 12.— Tokioka, 1953c, p. 28, pi. 1, fig. 2.— Tokioka, 1954b, p. 91. fig. 5.— 

 Tokioka, 1959a, p. 231. 



MATERIAL EXAMINED 



Japan: Honshu Island; off Ose Zaki, S. 81" W., 4.2 mi.; Albatross sta. 3713. 

 One specimen 12 mm. long (USNM 11731 ) . 



Description. — A single specimen 12 mm. long dredged from 65 

 fathoms in Japanese waters was examined. Branchial and atrial aper- 

 tures each surrounded by four small plates. Six folds on each side 

 of the branchial sac. Right gonad consists of 15 genital capsules, the 

 left gonad 16 capsules. Anal margin plain. 



