454 PROCEEDINGS OF THE NATIONAL MUSEUM vor.. 89 



Genus DISCOCELIDES Bergendal, 1893 



Definition. — Plehniidae with large prostatic vesicle in which the 

 glandular portion exceeds the muscular portion; vasa deferentia en- 

 tering separately the neck of the prostatic vesicle; Lang's vesicle large, 

 elongate. 



DISCOCELIDES ELLIPSOIDES (Girard, 1854)) new combination 



Figures 24, c; 25, a 



Leptoplana elUpsoides Gibard, 1854, p. 27, pi. 2, fig. 16 (not L. elUpsoides VsatBiLL, 



1893). 

 Leptoplana folium Vbxbhj^ 1873, pp. 487, 632. 

 Trigonoporus folium Verrill, 1893, p. 487, pi. 41, fig. 5, 6; pi. 42, fig. 5; pi. 44, 



figs. 4-7. 

 Trigonoporus dendriticus Verrux, 1893, p. 491, pi. 41, fig. 4 ; pi. 42, fig. 4 ; pi. 43, 



fig. 5. 



Material. — One whole mount, U. S. F, C. No. 15621, labeled Trigo- 

 noporus foliumi; one whole mount, U. S. F. C. No. 14337, labeled 

 Leptoplana elUpsoides; two unidentified vials, each with one speci- 

 men, in collection of U. S. National Museum; serial sections of 

 posterior half of first specimen ; anterior half remounted on original 

 slide. 



Form. — Elliptical, anterior end pointed, posterior more rounded 

 (fig. 24, c) ; thick, firm ; tentacles absent ; maximum length, 20-25 

 mm., breadth 10-15 mm.; margins thin, flexible, undulated. 



Eyes. — Marginal band limited to about anterior third; tentacular 

 eyes in rounded clustere; cerebral eyes in loose elongated groups, 

 which follow anteriorly the course of a pair of large nerve trunks 

 (fig. 24, c) ; scattered frontal eyes may occur between cerebral groups 

 and marginal band. 



Color. — Flesh, yellowish, or yellowish brown with dendritic brown 

 markings; reddish or pink tint on brain and main nerve trunks; 

 white areas over pharynx and copulatory apparatus. 



Digestive tract. — Pharynx central, small, short, with about five 

 lobes on each side; mouth at about center of pharynx; intestine ex- 

 tremely dendritic, the branches anastomosed into a network with 

 I'oundish meshes. 



Reproductive system. — Male copulatory apparatus large, conspic- 

 uous, immediately behind the pharynx. Vasa deferentia forming 

 "accessory seminal vesicles," i. e., expjmded tubes with a thin mus- 

 cular wall (fig. 24, c). These coil along the prostatic vesicle, enter- 

 ing the neck of this separately, one on each side. Prostatic vesicle 

 large, bulbous, free, its anterior part with a thick wall of circular 

 muscle fibers, which thins toward the neck of the prostate; the greater 

 part of the prostate composed of scalloped glandular interior, 



