POLYCLADS OF THE ATLaVNTIC COAST^ HYMAN 487 



Genus OLIGOCLADO Pearse, 1938 



Hymania Peabsb and Littler, 193S. 



Defimtion. — Eiiryleptidae with a uterine duct on each side lateral 

 to the uteri, running from the uterine gland to a median uterine 

 pore directly behind the blind end of the main gut; vasa deferentia 

 confluent behind the uterine pore ; otherwise as in Eurylepta. 



OLIGOCLADO FLORIDANUS Pearse, 1938 



Figure 31, c 



OliffOcJado flot'idanus Peaese, 1938, p. 88, fig. 32. — Pearse and Littler, 1938, p. 



241, pi. 20, fig. 8. 

 Hymania prytherchi Pearse and Littler, 1938, p. 239, pi. 21, figs. 10-13. 



MateAaH. — Number of whole mounts, some labeled OligocJado 

 ■floridanus, others Hymania pr^thercM., one set of serial sections 

 labeled Hymanm prytherchi, five living specimens sent from Beau- 

 fort by Dr. Pearse. 



Foi^i. — Oblong, ends rounded, or anterior end somewhat trun- 

 cate, very changeable, maximum length when crawling 29 mm., 

 width 12 mm.; tentacles long, slender, pointed, very mobile (for 

 general appearance see Pearse and Littler, 1938, pi. 21, figs. 10, 11). 



Eyen. — Cerebral eyes in paired elongated clusters; eyes on basal 

 half of anterior faces of tentacles and also in a pair of clusters on 

 anterior margin between tentacle bases (Pearse, 1938, fig. 32B; Pearse 

 and Littler, 1938, figs. 11, 12, pi. 21). 



Color. — Nearly white with a pinkish tinge and median deeper pink 

 band. The colors ascribed by Pearse to this species in his descii]i- 

 tions of Oligoclado -flondanus and Hymania prytherchi undoubtedly 

 resulted from ingested ascidians. The five living specimens that he 

 sent me and that had had no food for a few days had lost these colors 

 and were almost white. It is even probable that with further star- 

 vation the remaining pinkish tints would also disappear. 



Digestive system. — Pharynx tubular, mouth at anterior end of 

 pharynx behind brain. Pearse's description of gut erroneous; there 

 is no anus; Pearse and Littler's description of gut of ^''Hymania 

 prytherchP is correct. The main gut has three to several branches on 

 each side, which may form anastomoses, especially in posterior body 

 hair ; it ends blindly just in front of the uterine pore. 



Rep7'oductive system. — Description by Pearse contains several 

 errors; that by Pearse and Littler of '■''Hymania prytherchi'''' is sub- 

 stantially correct. The course of the male ducts is correctly figured 

 by Pearse and Littler (fig. 11, pi. 21), but the description is confused. 

 The vasa deferentia are confluent in the posterior part of the body 

 behind the uterine pore; they then course forward as coiled canals on 



