POLYCLADS OF THE EAST COAST — PEARSE 81 



slightly frilled, in anterior half of body; enteron anastomosed in 

 posterior half; uteri united posteriorly; male and female genital 

 apertures separate, at about the posterior end of the middle body 

 fifth. 



Type. — Conjuguterus parvus, new species. 



CONJUGUTERUS PARVUS, new species 



FiGtntE 29 



Body at least six times as long as wide. The type, examined alive 

 on March 11, 1935, was 5.2 mm long and 0.8 mm wide when extended 

 and crawling; preserved, it measures 1.93 by 0.94 mm; two other 

 preserved specimens measure 2.9 by 1.0 mm and 3.3 by 1.1 mm. A 

 specimen that laid 150 eggs in a dish in the laboratory on January 

 30, 1936, measures 1.5 by 0.6 mm preserved. A large specimen col- 

 lected on March 24, 1936, measured 10.3 by 1.9 mm when alive and 

 extended. In the preserved type, structures along the median line 

 measure the following distances from the anterior end : Eyes 0.24-0.38 

 mm; brain, 0.27-0.38 mm; pharynx, 0.39-0.82 mm; mouth, 0.58 mm; 

 uteri, 0.55-1.23 mm; vasa deferentia, 0.54-1.06 mm; male genital 

 aperture, 1.1 mm; female genital aperture, 1.3 mm. The eyes are 

 arranged in four pairs of groups lateral to the brain, which consists 

 of two elliptical lobes. The mouth, one-third of the body length 

 from the anterior end, is about in the center of the pharynx. There 

 are about 12 pairs of bifid enteric caeca lateral to the pharynx and 

 iiteri; behind the transverse connecting loop of the uterus there are 

 about 12 more pairs; about five caeca extend forward dorsal to the 

 eyes and brain. Behind the uterus the enteron consists, besides the 

 marginal caeca, of a median and two lateral trunks, which are con- 

 nected by about six transverse canals. 



The male genital system is directed backward. The small penis 

 is armed with a curved stylet. A pyriform seminal vesicle connects 

 with it as its base and also with a slightly smaller pyriform prostate 

 gland. The vasa deferentia unite anterior to the seminal vesicle; 

 they extend forward on either side of the pharynx to form a V. The 

 pyriform vagina is surrounded by the follicles of shell gland. The 

 uteri lie lateral and dorsal to the vasa deferentia. They are swollen 

 and somewhat twisted in gravid individuals; a transverse loop con- 

 nects them posterior to the vagina ; they taper anteriorly and may be 

 traced forward to about the middle of the pharynx. The body is un- 

 pigmented on the ventral side but the dorsum has small gray-brown 

 specks; the enteron and other organs are visible through the integu- 

 ment ; hence most specimens appear to be a delicate light brown. 



