96 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



33 (30), Anterior end of body wide, tapering to a point poster- 



iorly ; very active, often swimming genus Stylochoplana, 34 



34 (36). Color bright red, with light margins on which are pale 



yellow spots ; size, 38 by 6 mm ; Massachusetts. 



Stylochoplana oculifera (Girard, 1854) 



35 (35). Unpigmented with a delicate greenish tint; size 8 by 3 



mm ; Florida, North Carolina. 



Stylochoplana floridana, new species 



36 (23). Uteri not united anterior to pharynx 38^ 



37 (38). Body when extended six times as long as wide; mouth 



and pharynx in anterior half of body ; Florida, North 

 Carolina, Prince Edward Island, 

 family Stylochocestidae, Conjuguterus parvais, new genus and species. 



38 (37). Body round-oval; with prostate gland separate from vesic- 



ular duct; genital pores not close to posterior end; 



mouth and pharynx central family Planoceridae 



Body 29 by 10 mm ; color olive-green, with median dorsal 

 stripes; South Carolina to Massachusetts. 



Planocera nebulosa Girard, 1854 



39 (22) With or without marginal eyes'; body ribbonliko, delicate; 



pharynx and male genitalia near posterior end and 



the latter directed forward section Emprosthommata 



No nuchal tentacles ; eyes in genus Cestoplana do not 

 occur on margin, but in the present new genus Oculo- 

 plana they completely surround the body ; Florida, 

 North Carolina, 

 family Cestoplanidae, Oculoplana whartonl, new genus and species 



40 (1). With a sucker behind the genital pores; often with mar- 



ginal tentacles ; pharynx frilled, folded, or tubular. 



suborder Cotylea, 41 



41 (44). Usually large, often brightly colored, oval, rough or 



smooth; with foldlike marginal tentacles; mouth in 

 middle of front half of body; pharynx folded; enteron 

 reticulate ; sucker in middle of body ; vasa deferentia 

 and uteri branched; eyes in double cerebral groups and 

 anterior and posterior to tentacles family Pseudoceiidae, 42 



42 (43). Dorsum covered with long fingerlike papillae; Florida. 



Thysanozoon brocchi (Risso, 1818) 



43 (42). Dorsum not covered with long papillae ; Florida. 



Pseudoceros maculosus, new species 



44 (41). Marginal tentacles if present not foldlike, but .slender 



and conical or absent ; pharynx tubular 45 



45 (50). Body oval or elliptical in shape family Euryleptidae, 46 



46 (47). Without anterior tentacles; enteric caeca few and little 



branched ; P'lorida Acerotisa pellucida, new species 



47 (46). With 2 slender anterior marginal tentacles 48 



48 (49). Median stem of enteron with anus at posterior end; body 



18 by 8 mm ; brown, with median purplish band ; 

 Florida, North Carolina. 



Oligoclado floridanus, new genus and species 



^ The presence of ej'es around the entire body in the genus Oculoplana makes a revision 

 of Bresslau's Emprosthommata necessary. 



