POLYCLADS OF THE EAST COAST — PEARSE 75 



The genital pores are close together and near the posterior margin 

 of the body, less than one-thirtieth of the length of the body from the 

 posterior end. On each side of the body is a concentric area where 

 numerous small testes occur. The coiled vasa deferentia pass poste- 

 riorly on either side of the pharynx. They unite to form a large, 

 slightly coiled, pyriform seminal vesicle, which leads to the strong 

 conical penis, adjacent to the genital pore. The prostate gland lies 

 above the anterior half of the duct on the penis and opens independ- 

 ently. The uteri when empty lie lateral to the vasa deferentia but 

 when distended overlap them. They open into a globular vesicle, 

 which is posterior to the genital pore. Into it open the shell glands. 

 The ovate lobules of the ovaries lie in two crescentic areas lateral to 

 the pharynx, about 170 on each side. 



Color reddish brown or, less often, gray; the dorsum finely macu- 

 late. A light band, about 0.8 mm wide in a worm 22 mm long, ex- 

 tends down the median line from the anterior tenth to the posterior 

 fifth of the body. This is bordered for about 1.0 mm by a darker 

 region where pigment flecks are thicker. The ventrum is brownish 

 white, somewhat darker toward the margins; the pharynx and parts 

 of the genitalia show as white bodies. 



ry;?e.— U.S.N.M. no. 20188, from St. Vincent Bar, Apalachicola 

 Bay, Fla. ; collected December 27, 1935, by George W. Wharton. 



Remarks. — Specimens of this species have been taken from living 

 oysters by Dr. H. F. Prytherch at Shell Point, Swanquarter, Pamlico 

 Sound, N. C. ; J. F. Bass, Bulls Bay, Charlotte County, Fla. ; Albert 

 Collier, Seabrook, Tex.; Prof. Clyde T. Reed, Matagorda Bay, Tex.; 

 and by A. S. Pearse in Apalachicola Bay and in the region of Crooked 

 Island Sound, St. Joe Bay, Tampa, Eau Gallic, Englewood, and Crys- 

 tal River, Fla. In the National Museum collection are specimens 

 from Plumpoint and Island Creek, Talbot County, Md. 



This species is readily distinguished from Eustylochus ellipticus 

 (Girard) by the position of the brain and the cerebral eyes behind or 

 between the tentacles and by the absence of a reticulate color pattern. 



Section Schematommata 

 Family LEPTOPLANIDAE 



Genus NOTOPLANA Laidlaw 



NOTOPLANA ATOMATA (O. F. Muller) 



Polyscelis variabilis Gibakd, 1850, p. 251. 



This species has been reported from Maine by Miss Hyman (1938) 

 and was collected by the writer on the coast of Newfoundland dur- 

 ing the summer of 1938. 



85371—38 2 



