> 
THE NATURAL HISTORY SURVEY. 1 85 
Subfamily Zonitine. 
GrEnus OMPHALINA Rafinesque. 
Omphalina Rafinesque, Enum., etc., p. 3, 1831. 
Mesomphix (in part) BECK, Index Moll., p. 7, 1838. 
“Shell rather large and solid but thin, umbilicated, smooth 
below, lacking teeth or folds within; the lip simple and sharp.” 
“Foot double grooved above its margin, the grooves meet- 
ing above the tail in a mucus pore; sole tripartite; dorsal sur- 
face from head to mantle entirely lacking longitudinal grooves.” 
“Genital system lacking dart sac and other accessory 
gland. In O. fuliginosa the penis (P.), is a rather short stout 
Genitalia of OMPHALINA FULIGINOSA Griffith. (After Pilsbry, Proc. 
Phil. Acad. Sci., 184, pl.i, Fig. 5.) P, penis; agl, albumen gland; ovd, 
oviduct; rp, retractor muscle of penis; sp, spermatheca; spd, duct of 
same; vag, vagina; vd, vas deferens. 
sac, with the retractor muscle (rp.) inserted at its apex, and 
attached distally to the floor of the lung. Internally the distal 
half of the cavity of the penis is densely, finely and rather 
sharply granulated; the opening of the vas deferens is near the 
apex of the cavity, and is not provided with a papilla. The 
lower portion of the vas deferens (vd.) is enormously swollen; 
and for a short distance from its insertion it is firmly bound to 
the penis itself.” ; 
“The vagina (vag.) is curiously swollen near the base. The 
