A. E. Verrill — Marine Flanarians of N'ew England. 471 



at Eastport, Me., nor elsewhere in the Bay of Fundy, Therefore 

 the specimen received from Capt. Coffin marked as from the New- 

 foundland Banks may be regarded as doubtful, as to locality. 



I have referred this species to the Planocera elliptica of Girard 

 with much hesitation, for Dr. Girard did not publish anj^ description 

 of his species b}^ which it could be identified. He did not even 

 mention the arrangement of the ocelli in either of his papers, but 

 said, incidentally, that he understood the genus Planocera as in- 

 cluding StyloeJnis. Hence it may be inferred that his species had 

 ocelli in the tentacles, but not necessarily marginal ocelli. My prin- 

 cipal reason for uniting S. littoralis with his species is because 

 it has proved, in my experience, to be the common shore species in 

 the region of Massachusetts Bay, where Girard obtained his speci- 

 mens. Nor have I found in that district any other species which 

 could be referred to his species with any degree of probability what- 

 ever. As Dr. Girard published an important paper on the embry- 

 ology of his species, it is very desirable to retain his specific name, 

 if it can be located with any considerable degree of certaint3^ 



Planocera Blainv., 1828 (emeBd.) 



Ptawocera Stimpson, Prodromus, p. 5, 1857 (emend.) 

 Lang, Polycladen, p. •134, 1884 (emend.) 



Body oval or elliptical and rather flat in extension, thickened and 

 convex when contracted. Tentacles slender, tapered, reti-actile, situ- 

 ated at some distance from the anterior end of the body. A cluster 

 of ocelli is generally situated in the base of each tentacle ; usually 

 others form clusters between and behind the tentacles ; marginal 

 ocelli wanting in the typical species, sometimes numerous. Genital 

 pores sepai'ate, but near together, situated a short distance from the 

 posterior end of the body ; female duct is short U-shaped, usually 

 with a copulatory i^ouch and accessory vesicle (spermatheca) ; the 

 vagina opens backward ; the spermatheca is above or behind the 

 vagina. 



I have modified the generic characters so as to include species 

 which, like the following, have marginal ocelli, but otherwise agree 

 nearly with the typical species. For this group I propose, however, 

 to establish a new subgenus : 



Subgenus, Planoceropsls, uov. 



Tentacles, cerebral ocelli, pharynx, and stomach as in typical 

 Planocera; marginal ocelli present. Reproductive organs mostly 



