POLYCLADS OF THE EAST COAST — PEARSE 89 



dian band and a cream-colored margin. The brown color appeared 

 to be due largely to the enteron. The ventrum was light brown, with 

 a light band through the middle two-thirds of the body, probably due 

 to the genitalia. 



The specimen preserved, stained, and mounted is 12.8 mm long and 

 8.0 mm wide. Organs in the median line are the following distances 

 from the anterior end : Brain, 1.5 mm ; pharynx, 1.75-4.4 mm ; mouth, 

 2.0 mm; male genital opening, 4.2 mm; female genital opening, 5.2 

 mm ; ventral sucker, 6.7 mm ; median enteric stem, 5.5-9.9 mm ; anus, 

 9.8 mm. The tentacles are 1.3 mm long, slender, and tapering. About 

 80 eyes are at and between their bases ; about 50 eyes occupy the prox- 

 imal half of each tentacle ; about 70 cerebral eyes are arranged in the 

 form of a horseshoe, with the opening posterior. 



The tubular pharynx lies immediately behind the brain. From it 

 the median enteric stem extends to the anus. Three pairs of lateral, 

 branched caeca leave the stem in its anterior half and extend to all 

 margins of the body. On each side of the anus two tubes extend for- 

 ward to the anterior ends of the uteri and there connect with the 

 anterior ends of what appear to be two lateral glandular organs, which 

 measure about 1.3 by 0.4 nma. 



The male genital system opens on the ventral side of the body at 

 the anterior margin of the posterior ninth of the pharynx. A coni- 

 cal antrum leads to a slender penis, which bears a spine and is en- 

 closed in a sheath. Connected with the penis are two organs : A small 

 spherical prostate gland and an elongated, pyriform seminal vesicle. 

 The vasa deferentia extend forward on either side of the pharynx for 

 a short distance and then coil backward and fuse behind the anus. 

 They extend posteriorly beyond their point of fusion to form a small 

 loop and a blind appendage. Numerous small testes are distributed 

 all round the body, except for a band (0.75 mm wide) about the mar- 

 gin and in the median space occupied by enteric and genital organs. 

 The slightly larger ovaries have about the same distribution. The 

 cylindrical uteri extend longitudinally on each side of the median 

 enteric stem ; length, 3.7 mm ; width, 0.3 mm. The ventral sucker is 

 between their middles. There appear to be three pairs of globular 

 uterine glands on their anterior halves. Two ducts lead from their 

 anterior ends to the shell gland and the ventral genital pore. 



r^/pe.— U.S.N.M. no. 20192, from Crooked Island Sound, Farm- 

 dale, Fla. ; collected November 21, 1935, by A. S. Pearse. 



During the summer of 1938 several specimens of this species were 

 found at Beaufort, N. C. 



