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THE NATURAL HISTORY SURVEY. 225 
Orthurethra. 
Ureter passing directly forward from the kidney toward 
the anterior of the lung. (Pilsbry.) 
FAMILY PUPIDA. 
Shell: Usually small, multispiral, generally elongated; 
aperture frequently contracted by internal teeth. 
Ammal: Tentacles small or wanting; foot very short, ob- 
tuse or pointed behind; jaw smooth or finely striated, fre- 
quently strengthened by the addition of a superior, arched 
plate, giving it the appearance of a double jaw; dentition re- 
sembling Hex, central and lateral teeth of same form and 
size (generally), tricuspid; marginals quadrate, low, wide, den- 
ticulated. 
Genus STROBILOPS Pilsbry. 
Strobtlops PILSBRY, Proc. Phil. Acad., p. 408, 1892. 
Strobtla MorRsE, Journ. Portl. Soc., Vol. I, p. 26, figs. 64-67, pl. ii, fig. 12, 
a, b; pl. viii, fig. 68, 1864. (Non Szrodzla Sars, 1888; Strobzlus 
Anton, 1859.) 
Shell: Strongly striated, depressed-conic, umbilicated; 
aperture lunate; peristome reflected; parietal wall armed with 
several lamelle which are provided with sharp, spiny projec- 
tions at regular intervals. 
Animal: Similar to that of Pyramidula. 
Faw: Long and narrow, arched, ribbed. 
Radula: With numerous teeth similar to those of Puja. 
Distribution: North America and some of the West Indies. 
87. Strobilops labyrinthica Say, pl. xxx, fig. 14. 
flelix labyrinthica Say, Journ. Phil. Acad., Vol. I, p. 124, 1817. 
Strobila morset DALL, Proc. U.S. Nat. Mus., p. 263, 1885. (Variety.) 
Strobila strebeli PFEIFFER, Malak. Blatt., Vol. VIII, pl. i, Figs. 5-8. 
Variety.) 
Shell; Small, depressed-conic, umbilicated; surface cov- 
ered with numerous heavy, oblique ribs, which are much finer 
on the base than on the upper surface; the apex is smooth; 
color brownish horn; whorls six, rounded, regularly increasing 
in size, the last somewhat globose; sutures well impressed; 
spire globose-conic or depressed; aperture lunate, a trifle ob- 
lique; on the parietal wall there are three revolving ribs, two 
of which nearly or quite reach the aperture while the third 
lies between these and is more deeply seated; these ribs are 
