eo 
THE NATURAL HISTORY SURVEY, 193 
dirty white, blackish or bluish on head, tentacles and eye- 
peduncles; pedal grooves and mucus pore as in /igera. 
Jaw: Similar to that of Agera. 
Radula formula: §9+45+1+15+% (45—1—45); charac- 
ters of the teeth not differing essentially from those of Ligera. 
Genitalia: Differing from “gera in having a second acces- 
sory pyriform gland to the dart sac. (Binney.) 
Distribution: Western Pennsylvania to Georgia, west to 
Arkansas and eastern Texas. (Pilsbry.) 
Geological distribution: Pleistocene; Loess. 
Habitat: Same as that of digera. . 
Remarks: Distinguished from dgera by its smaller size, 
more depressed spire and transverse aperture. This is nota 
common species and seems to be confined to the southern 
region, as no specimens have thus far been collected in any 
other part of the territory. | 
FAMILY LIMACID. 
“Shell rudimentary, a calcareous plate, not spiral, concealed 
under the mantle,and covering the respiratory cavity. Foot 
with or without mucus pore; jaw oxygnathous, arcuated, with- 
out ribs, with a rostriform projection on the inferior margin; 
lingual plate with a tricuspidate central tooth, the middle cusp 
long and narrow, laterals bi- or tricuspidate, marginals narrow, 
sharp, uni- or bicuspidate.” (Tryon.)* 
Genus LIMAX Linné, 1758. 
“Animal attached its whole length to the foot, subcylin- 
drical, tapering behind, bluntly truncate anteriorly; tentacles 
simple; mantle small, anterior, enclosing a shelly plate; no 
caudal mucus pore; a distinct locomotive disk; external anal 
and respiratory orifices at the right posterior margin of the 
mantle; orifice of combined generative organs behind and be- 
low the right peduncle.” 
“Shell-plate testaceous, thin, flat, longer than wide, with 
concentric striz of increase, internal.”’ 
“Jaw smooth with median projection. Lingual membrane 
long and narrow; central teeth tricuspid, laterals bicuspid, mar- 
ginals aculeate, often bifid. Considerable variation is found in 
the dentition of the genus; the centrals and laterals are some- 
times unicuspid.” (Tryon.)* 
~~ #*Struct. and Syst. Conch., Vol. III, p. 78. 
