270 



Occasional Paf^crs Bcrnicc P. Bishop Museum 



Figure 4. Vitrina tenella Gould : a, animal, much contracted, showing 

 position of dorsal and shell-lobes ; b, genitalia, ventral aspect ; c, lower 

 genitalia drawn to a larger scale, dorsal aspect (x, the enlargement at the 

 base of the spermatheca) ; d, lung; e, teeth (X 380). 



a. Ant. LDL, anterior left dorsal lobe; LSL, left shell-lobe; Post. 

 LDL, posterior left dorsal lobe ; RDL, right dorsal lobe ; RSL, right shell- 

 lobe, b. Alb, albumen gland; HD, hermaphrodite gland; Ov, oviduct; 

 P, penis ; Prost, prostate gland ; Sp, spermatheca ; VD, vas deferens. 

 c. Ov, oviduct ; P, penis ; PR, penial retractor ; Sp, spermatheca ; VD, vas 

 deferens ; x, enlargement at base of spermatheca. d, H , heart ; In, intes- 

 tine ; K, kidney ; Ur, ureter. 



The pulmonary vein could not be made out in the specimen. The 

 kidney is saccate in outline; the basal portion is shown opened (fig. 4, d). 

 The ureter accompanies the right side of the kidney, passing over to the 

 intestine near the base of the kidney; it enlarges rather abruptly just before 

 reaching the intestine and continues forward as a broad duct. 



The genitalia are extremely simple. The albumen gland is very large, 

 roughly triangular in outline. The oviduct is tightly twisted. The sperma- 

 theca is rather large, its duct medium in length and broad, enlarging at its 

 base and uniting with the oviduct close to the cloaca (fig. 4, c at x). The 

 penis is simple cylindrical, about l^ mm. in length. The vas deferens is 

 closely united to and accompanies the penis, entering close to the distal 

 end of the latter organ. The penis retractor is very short and united to 

 the penis and vas deferens just below their union. 



The teeth are typical of the genus, the formula being 1-8-32 ; the cen- 

 tral with a rather long cutting point and two minute ectocones ; the laterals 



[10] 



