POLYCLADS OF THE EAST COAST PEARSE 83 



Section Emprosthommata 



Family CESTOPLANIDAE 



OCULOPLANA, new genus 



Similar to Cestoplana^ but with marginal eyes completely around 

 the body. The brain is far back, at least a fifth of the length of the 

 body from the anterior end. A branch of the gut extends forward 

 in the median line dorsal to and between the lateral lobes of the brain 

 to the anterior margin of the body. 



OCULOPLANA WHARTONI, new species 

 FlGTJBE 30 



Body long and slender; in living specimens at least eight times as 

 long as wide when crawling (8 by 1 mm), often longer when ex- 

 tended. In three well-preserved specimens the body is five times as 

 long as wide (11 by 2.1; 8.9 by 1.7; 8.3 by 2 mm, type). The body is 

 blunt and rounded at both ends; the sides are parallel, and the mar- 

 gins are so thin and mobile that they curl readily. At the posterior 

 end there is a weak, poorly defined adhesive organ. 



The enteron extends throughout the body. From the median stem 

 about 95 branched lateral twigs and a dozen short blind pouches ex- 

 tend on each side. The median stem extends forward and branches 

 along the anterior margin. The mouth is situated at the anterior 

 end of the posterior fifth of the body. The pharynx at rest is about 

 0.75 mm long and 0.35 mm wide; two-thirds of it lies behind the 

 mouili. 



Ti ie brain is in the anterior end of the second fifth of the body. Its 

 total width is about 0.35 mm ; the two lateral lobes are 0.1 mm apart. 

 The single female genital aperture is about one-ninth of the length of 

 the body from the posterior end, and the male aperture is about 0.1 

 mm anterior to it and close to the pharynx. The vasa deferentia and 

 the uteri are to be seen extending forward through a third of the 

 length of the body. Both lie nearly parallel to the median line ; the 

 former lie lateral to the latter and are more or less twisted. The 

 penis is unarmed. A pyriform prostate gland is distinct from the 

 siminal vesicle. About 50 small testes lie on either side of the body 

 through about the middle fifth. 



Living animals are pale yellowish white, without pigment ; the yel- 

 lowish enteron shows clearly through the integument; some individ- 

 uals have a delicate pinkish tint. 



Type.—V.^.'^M. no. 20195, from St. Vincent Bar, Apalachicola 

 Bay, Fla. ; collected August 16, 1935, by George W. Wharton. 



