270 Occasional Papers Bernice P. Bishop Museum 
8 10 
Ha 2627 
Oia fi 
Ficure 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; Jn, 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 1% 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 
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