PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 219 



presei\ed specimens. Generally gonad curves strongly as is shown 

 in original description, although not curved so much on left side of the 

 13 mm. long specimen from Wake Island (tig. dSh). Ovary dark 

 reddish. 



Trunk of larva ellipsoidal in shape, o30/i, in length. Tail first laid 

 along ventral side of trunk, turns to left at right angles, then proceeds 

 along left side of trunk to reach near dorsal edge slightly in front 

 of sensory organ situated slightly posterior to the middle of body. 

 Three attachment processes small, together form a small, low triangu- 

 lar prominence (fig. 9Sk). Larval test wholly sprinkled with small 

 dotted flecks. 



Remarks. — The Saipan and Palau specimens are provided with typ- 

 ical curved gonads and fewer brancliial plications (6), while the speci- 

 mens from Wake Island have more (6 to 8) branchial plications and 

 show some resemblance to Microcosmos exasperatus in the appear- 

 ance of the lobated gonad. Thus, it is not impossible that the present 

 species is continuous with the small-sized specimens of M. exasperatus 

 known from some ocean islands, and it W'Ould represent an extremity 

 of wide variation, opposite the specimens from the coast of Amoy, 

 which are considered to represent the other extremity of the variation. 



112. Halocynthia roretzi (von Drasehe) 



(Styela?) Cynthia Roretzii von Drasehe, 1884, p. 376, pi. 5, figs. 4-8; pi. 6, fig. 1. 

 Halocynthia roretzi Tokioka, 1953a, p. 282, fig. 20 ; pi. 71, figs. 1-4 ; pi. 72, figs. 

 1-11. (Synonymy.) 



MATERIAL EXAMINED 



Japan: Hokkaido Island; Otaru. K. Katakura, collector; Albatross Exped. 

 One specimen (USNM 11784). 



Description. — A single specimen, 150 mm. long, is in the collection. 

 Protuberances on body surface are all stout. 



113. Halocynthia aurantium (Pallas) 



Ascidia aurantium Pallas, 1787, p. 240, pi. 7, fig. 38. 



Halocynthia aurantium Van Name, 1945, p. 362, pi. 31, fig. I. (Synonymy.) — 

 Tokioka, 19.51a, p. 17, fig. 13. 



MATERIAL EXAMINED 

 Japan: Hokkaido Island; Otaru. E. S. Morse, coll. Two specimens (USNM 

 11689). 



Remarks. — The two specimens examined were collected at Otaru 

 of Hokkaido Island, Japan, and presented to the U.S. National Mu- 

 seum from the Tokyo University in an exchange of specimens. They 

 are respectively 17 mm, and 30 mm. long, excluding a tuft of rooty pro- 

 tuberances about 15 mm. in length. The preservative alcohol is a 

 deep orange, indicating that the animals were evidently orange red 

 when alive. 



206-191— '67— ^15 



