POLYCLADS OF THE EAST COAST — PEARSE 95 



15 (16). Color yellowish gray, with brown spots at margin; tenta- 



cles small obtuse ; pharynx with 5 pairs of lateral 

 branches; Massachusetts, [? South Carolina]. 



Stylochus frontalis Verrill, 1893 



16 (15). Color pink or gray; tentacles acute; pharynx with more 



than 5 pairs of lateral branches 17 



17 (18). Body large, 53 by 27 mm ; color pink with small oval flecks 



on a creamy background ; Apalachicola Bay, Fla. 



Stylochus floridanus, new species 



18 (17). Body usually of medium size, 48 by 28 mm; color gray; 



east and west coasts of Florida — Stylochus inimicus Falombi, 1931 



19 (20). Body slender, 20 by 6 mm; brain and cerebral eyes in 



front of nuchal tentacles ; color yellowish brown or 

 reddish, pattern reticulate ; New England. 



Eustylochus ellipticus (Girard, 1850) 



20 (19), Body little more than twice as long as wide when ex- 



tended, 24 by 11 mm ; brain and cerebral eyes behind 

 and between nuchal tentacles ; color reddish or some- 

 times gray, pattern not reticulate ; Maryland to Texas. 



Eustylochus meridianalis, new species 



21 (2), Without marginal eyes, or with body ribbonlike and eyes 



around whole margin ; body more or less delicate 22 



22 (39). No marginal eyes, and eyes that are present far from 



front ; male genitalia directed posteriorly ; body not 



ribbonlike section Schematommata, 23 



23 (36). Body somewhat elongated; without or with nuchal ten- 



tacles ; prostate gland separate when present ; penis 

 with or without stylet ; uteri united anterior to pharynx. 



family Leptoplanidae, 26 



24 (29). No tentacles; body elongated, elliptical in outline; margin 



more or less folded genus Leptoplana, 25 



25 (26). With about 12 pairs of lateral pharyngeal lobes; color 



light brown with darker median streak ; length 12-16 

 mm by 4-6 mm ; Massachusetts, Baflin Bay, North Caro- 

 lina, Florida Leptoplana angusta Verrill, 1893 



26 (25). With 6 or fewer paired pharyngeal lobes 27 



27 (28). Mouth anterior to middle of pharynx; color pale brown, 



with darker flecks; size 18 by 10 mm; Cape Cod, 13.5 



to 31 fathoms Leptoplana virilis Verrill, 1893 



28 (27). Mouth about in middle of pharynx; color variable, yellow- 



ish brown, salmon, greenish ; Massachusetts, Maine, 

 Newfoundland; to 42 fathoms. 



genus Notoplaua, N. atomata (O. F. Miiller, 1776) 



29 (24). With nuchal tentacles 30 



30 (33). Body elliptical with rather pointed ends ; in gastropods. 



genus Hoploplana, 31 



31 (32). Lateral pouches of pharynx with smooth basal trunks; 



cerebral eyes usually arranged in an irregular circle ; 

 size 3.0 by 2.1 mm ; in Thais; Florida. 



Hoploplana thaisana, new si)ecies 



32 (31). Lateral pouches of pharynx saccate to base; cerebral eyes 



usually arranged in shape of a horseshoe with a pos- 

 terolateral opening ; size 6 by 4 mm ; in Busycon; Massa- 

 chusetts Hoploplana inquilina (Wheeler, 1894) 



