1912.1 NATURAL SCIENCES OF PHILADELPHIA. 467 



The pharyngeal sheath (PL XII, fig. 1) is of nearly half the body 

 length and is provided with broad, irregularly lobed branches. 

 Owing to the compression of the animal during its fixation, the main 

 intestine cannot be clearly differentiated from the pharynx, but it 

 apparently exists as an elongated organ extending the full length of 

 the pharynx posteriorly and at least as far as the brain anteriorly. 

 Approximately sixteen pairs of lateral branches have been distin- 

 guished which appear to finally anastomose, though of this we cannot 

 be positive. 



The brain is situated one-third of the distance from the mouth to 

 the anterior end of the body, but neither it nor the nerves originating 

 from it present any noteworthy features. 



The testes are placed in the ventral half of the body, and although 

 no anastomosing system of sperm canals could be distinguished, the 

 position of the male reproductive glands suggests that one probably 

 exists. The vasa deferentia (PL XII, fig. 1) present the form of a 

 heart-shaped loop, since they are continuous across the mid line 

 immediately behind the female aperture, from whence they extend 

 anteriorly and laterally to arch inward ventral to the uteri opposite 

 a point not far behind the mouth. They then bend backward and 

 inward and, fusing, unite with the seminal vesicle (PL XIII, fig. 12), 

 surrounded by an ellipsoid muscle sheath, situated immediately 

 behind the posterior end of the pharynx. Emerging from this organ, 

 the canal immediately pierces the spherical granular gland and 

 enters the base of the penis. This last-named organ is unusually 

 thick at its base in proportion to its length, and in the type specimen 

 the opening to the exterior is opposite to its base. 



The ovaries are dorsal and are connected with the uterus by an 

 anastomosing system of capillaries. The uteri entirely surround 

 the pharj-nx since they are continuous across the mid line anteriorly. 

 Posterior to the penis, these canals swing inward and unite to form 

 the single, median egg canal (PL XIII, fig. 12) that on one hand 

 expands to form the spacious antrum femininum and in the other 

 direction communicates with the accessory gland, a long, roomy sac 

 extending well behind the female reproductive pore. 



Leptoplana saxicola sp. nov. 



This small flatworm is represented by numerous individuals taken 

 at a point a few miles south of the entrance to Monterey Bay. It 

 occurs usually in masses of algae (Cladophora) in tide pools of such 

 elevation that the water is renewed only during rough weather. 

 Dorsally the ground color varies from yellowish to grayish-brown. 



