1880.] ' NATURAL SCIENCES OF PHILADELPHIA. Ill 



of the intestine rather wide, its curve reaching to the bulbus pharyn- 

 geus. The liver about 5.0 mm. long by a breadth of 3.5 and a height 

 of 3.25 mm. ; the form conical, the posterior end rounded, the anterior 

 much broader, flattened and adjoining another flattening on the infe- 

 rior part of the right side of the organ ; the color was yellowish. 



The sanguineous gland of quadrangular form, of a diameter of about 

 1.5 mm., whitish. 



The hermaphroditic gland with its yellowish-white lobes covering 

 nearly the whole surface of the liver : in the lobes large oJgene cells. 

 The anterior genital mass of the length of about 4.0 mm. by a height 

 of 3.0 and a breadth of 1.5 mm. The ampulla of the hermaphroditic 

 dact resting on the inferior margin of the genital mass, whitish, 

 straight, of the length of 3.0 mm by a diameter of about 0.5 mm. 

 At the anterior end of the ampulla a flattened body (prostate) that 

 freely projects before the anterior margin of the rest of the genital 

 mass ; it was of about the same length as the ampulla, but nearly twice 

 as broad ; the cavity of the organ rather large and the walls rather 

 thin. The prostate slopes gradually into the thin but strong spermato- 

 duct, which is about 6.0 mm. long and terminates in the penis, which 

 was short, conical (fig. 8«, 9), about 0.75 mm. long, and terminated 

 in a somewhat flexible, yellowish glans (fig. 8, 9, 14), of the length of 

 about 0.37 mm. by a diameter at the base of about 0.09, and at the 

 point of 0.037 mm.; through the largest part of its length it was 

 covered with (in all about twelve) series of small chitinized crests, 

 which did not surpass the height of about 0.0025 mm. (fig. 14 i; the 

 armature only continued through a short part of the interior of the 

 spermatoduct. The spermatotheca spherical ; the spermatocysta pyri- 

 form, filled with sperma. The cordate mucous gland whitish and 

 yellowish-white (fig. 8b). 



This species approaches to the Pol. Lessonn, but seems even dif- 

 ferent in color from that and the other Atlantic forms, and also differs 

 in the slight development of the frontal veil and of the lateral crests of 

 the back, as well as in the number of the external plates of tongue, 

 and' in the nature of the armature of the penis. 



* The armature of the penis of Polyc. quadrilineata (hitherto the only 

 species in which an armature has been described) as figured by Friele and 

 Hansen (1. c. Tab. II, fig. 3) is very different from that of the Pacific spe- 

 cies, and that difference has been confirmed by my examination of typical 

 specimens. 



