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204 THE CHICAGO ACADEMY OF SCIENCES. 
simple, or armed with folds or denticles; color horn, with vari- 
ous zigzag, reddish flames. 
Animal: With a well-developed caudal mucus gland and 
supra-pedal furrows. Genitalia lacking accessory appendages. 
Jaw ribbed or striated. Central tooth quadrate, with side 
cusps and distinct cutting points; lateral teeth similar; mar- 
ginal teeth low, wide, crowded, with one or more cusps, “the 
outer cusp never elevated on middle cusp.’”’* 
Subfamily Endodontine. 
“Jaw soldered into one piece.’ (Pilsbry.) 
Genus PYRAMIDULA Fitzinger, 1833. 
Pyramidula FITZINGER, Syst. Verzeich, 1833. 
Discus FITZINGER, Syst. Verzeich, 1833, 
Patula HELD, Isis, 1837. 
Anguispira MORSE, Journ. Port. Soc., Vol. I, p. 11, fig. 15, 1864, ‘ 
“Shell: Openly umbilicated, varying in contour from flat- 
tened and disk-like to conoidal. Generally opaque, often rib- 
striate. Unicolored, spirally banded or flammulate. Whorls 
subcylindrical or keeled, the apex generally smooth. Aperture 
rounded-lunate; lip simple and thin.” 
“Animal: Having the sole undivided; lateral margin of the 
foot with a distinct border bounded by a groove, the grooves meet- 
ing above the tail. No caudal mucus pore. Eye-peduncles 
long and slender. Genital system lacking accessory organs; 
vas deferens and retractor muscle inserted near or at the apex 
of the penis; duct of the spermatheca very long; hermaphro- 
dite duct very long, but shortened by its extreme convolution. 
Jaw arcuate, its component lamine generally compactly sol- 
dered, and indicated only by fine striz which diverge slightly 
from the middle. Radula (1) having only the mesocones de- 
veloped upon central or inner lateral teeth, or (2) having the 
centrals tricuspid, laterals bicuspid lacking the ectocones, mar- 
ginal teeth similar but with short basal-plates; this being the 
usual form. In some species the marginal teeth are multicus- 
pid by the splitting of their ectocones.” (Pilsbry.)T 
KEY TO SPECIES OF PYRAMIDULA AND HELICODISCUS. »° 
A. Shell large. ° 
a. Subglobose, periphery rounded, striz very fine, last 
whorls with two spiral, reddish bands............... solitaria 
*Pilsbry, The Nautilus, Vol. IX, p. 110. 
+Guide to Study of Helices, pp. 42, 48, 49. 
