170 PROCEEDINGS OF THE ACADEMY OF [Sept., 



about opposite the mouth. Proximally, the uteri converge immedi- 

 ately behind the male reproductive opening and enter the short, 

 stout egg canal (PI. XVI, fig. 30) that in turn communicates with a 

 short yet spacious accessory sac situated in several instances anterior 

 to the external opening. Posteriorly, the egg canal expands into 

 the antrum femininum which communicates exteriorly by means 

 of a pore very close to that of the male reproductive system. In a 

 few individuals, young and old, there is a common reproductive 

 opening. 



Although this is a small species, the ova are the largest that have 

 been observed by us. In one case measurements showed the diameter 

 of an ovum to be one-seventh the width of the body, or more accur- 

 ately stated, its diameter was 0.61 mm. About opposite the seminal 

 vesicle, and within the loops of the vasa deferentia, there are to be 

 seen a pair of small gland-like bodies (PI. XVI, figs. 30, 85) whose 

 connections have not been traced. 



Leptoplana californica Plehn. 



Broad oval. Length 12 mm., breadth 9 mm., broader in front 

 than behind. Colorless in alcohol. Pharyngeal pocket central, 

 in length equal to one-half that of the animal, with seven pairs of 

 average-sized lateral diverticula, containing the sharply folded 

 pharynx. Tentacle eye clusters small, elliptical, diverging anteriorly ; 

 cerebral groups longer and narrower, converging anteriorly, with a 

 single large eye terminating each in front. Common sex opening 

 near posterior end of body, leading on one hand into an ample bursa 

 copulatrix and posteriorly into a large accessory chamber; uteri, 

 surrounding the pharynx, lead to a well-developed antrum femininum ; 

 penis with a long, sharp and flexible stylet; a granular gland and 

 seminal vesicle on direct line to union of vasa deferentia. 



Type locality, Monterey Bay, Calif., at a depth of 30-40 meters. 

 Two specimens in our collection agree with the foregoing description. 



Leptoplana inquieta sp. nov. 



Four species represent this species captured about the low-tide 

 limit among the rocks, and in one case among the rhizoids of Macro- 

 cystis in Monterey Bay. It is a small, restless species, crawling 

 rapidly when disturbed, but never swimming. Dorsally the color 

 is cleai-, translucent white, dotted more or less uniformly with small 

 dark red pigment spots. Ventrally it is unpigmented, and the- 

 pharynx and vasa deferentia show faintly through the body wall. 



The largest specimen is broadly oval in form (PI. XIII, fig. 8) 



