456 PROCEEDINGS OF THE NATIONAL MUSEUM vor,. 89 



eosinophilous (fig. 25, a) . After receiving vasa deferentia, narrowed 

 distal end of prostate discharges into penis lumen. Penis papilla 

 short, stout, posterior side very different from anterior. Posterior 

 wall contains masses of structureless, apparently cuticular material, 

 appearing black in whole specimen, and also much glandular mate- 

 rial as coarse eosinophilous granules. Penis papilla appears to be 

 protruded in specimen (fig. 25, a) so that there is no definite male 

 antrum or male pore. Female pore some distance posterior to penis 

 (figs. 24, c ; 25, a) , opens into long vagina with high epithelium and 

 circular and longitudinal muscle layers; this proceeds forward to 

 point above penis papilla, then makes a sharp backward bend and 

 parallels its former course as a narrower tube, the stalk of Lang's 

 vesicle. This stalk after proceeding posteriorly beyond the female 

 genital pore opens into the large, elongate Lang's vesicle. The uteri 

 enter the vagina shortly behind the bend (fig. 25, a). Numerous 

 shell glands accompany the vagina near the entrance of the uteri 

 and occur along the stalk of Lang's vesicle. 



Distribution. — Long Island Sound northward, uncommon, found 

 in shallow and deeper waters, to 1,100 feet, among rocks and shells. 

 Found by Stimpson in the Bay of Fundy at 24 and 180 feet; found 

 by Verrill at several points from Rhode Island to Maine in 24 to 270 

 feet. The four specimens available to me have the following labels : 

 Slide No. 15621, Massachusetts Bay, ISpeedwell^ July 26, 1878; slide 

 No. 14337, Bay of Fundy, 1872; vial. Station 2486, Albatross, off 

 Nova Scotia, lat. 44° N., long. 57° W., July 5, 1885, 1,140 feet; vial, 

 Station 292, Speedwell, mouth of Cape Cod Bay, Race Point Light, 

 August 11, 1879, 174 feet. 



Habits. — Active, restless, can swim by active undulations, ac- 

 cording to Stimpson; Verrill makes no statements about the animal's 

 swimming. 



Neotype. — Slide No. 15621 is made a neotype; anterior half as 

 whole mount on original slide; posterior half as serial sections. 



Remarks. — Slide No. 15621 is labeled Trigonoporus folium, and 

 this identification was made by Verrill himself. Comparison of this 

 specimen with Verrill's description of T. folium leaves no doubt of 

 the identity. There is little doubt in my mind that T. folium and T. 

 dendriticus are conspecific. Verrill's description and figures show no 

 definite differences, and one of the specimens in a vial mentioned 

 above came from almost the identical locality where Verrill collected 

 his specimens! of "T". dendriticus}''' It remains therefore to consider 

 whether Leptoplana ellipsoides Girard and Trigonoporus folium Ver- 

 rill are conspecific. As already noted, slide No. 14337 from the Bay 

 of Fundy, hence the locality from which the original specimen of L. 



