1912.] NATURAL SCIENCES OF PHILADELPHIA. 479 



geal pocket, which in the present instance contains a long and slender 

 proboscis, protruded a short distance beyond the mouth opening. 

 Posteriorly the pharynx leads into the capacious main gut which 

 gives rise to five pairs of lateral intestinal branches together with an 

 anterior terminal one. At the outset all of these branches are 

 comparatively large and of fairly even caliber, but they soon become 

 transformed into a branching, non-anastomosing system of rather 

 narrow twigs. The sucker underlies the gut between the fourth 

 and fifth pairs of lateral branches. Beyond the last pair the gut 

 extends posteriorly to a point close to the posterior end of the body. 



The brain is situated directly over the mouth, but as the nerves 

 arising from it are seen with much difficulty, no serious attempt has 

 been made to determine their distribution. 



The testes are rather uniformly distributed ventrally, but the 

 capillaries leading from them are invisible in the present specimen. 

 The vasa deferentia (PI. XII, fig. 5) arise at the end of the first body 

 third, midway between the gut and the margin of the body, and 

 converge anteriorly as simple though much swollen and convoluted 

 ducts. Opposite the middle of the pharyngeal pocket they pass 

 inward toward the mid line to fuse mesally at the point where the 

 oval seminal vesicle is located. From this last-named organ a short 

 ejaculatory duct extends anteriorly to the penis situated immediately 

 behind the mouth. The male reproductive pore could not be deter- 

 mined with absolute certainty. Certain features suggest that it 

 opens into the mouth, and on the other hand there are faint indica- 

 tions that it is situated immediately behind the mouth, yet inde- 

 pendent of it. A granular gland was not distinguished. 



The ovaries are dorsal. The uteri (PI. XVII, fig. 38), originating 

 at the level of the sucker, are so greatly inflated by multitudes of 

 eggs that they exceed the main gut in caliber. Between the second 

 and third pairs of gut branches the uteri fuse and send forward a 

 short, slender duct, the vagina, which communicates with the exterior 

 close to the posterior end of the pharyngeal pocket. 



Contrary to the rule, no uterus glands could be detected where, 

 according to Lang, one pair should exist. 



ANCILIPLANA gen. nov. 



Body broadly elliptical. Tentacles large, without eyes; cerebral 

 eyes in two distinct groups. Pharynx small; main gut slender 

 with 8 pairs of branches, highly anastomosed. Vasa deferentia 

 and uteri anastomosed. No uterus glands. 



