49 MICHIGAN SURVEY, 1905. 



Limax campestris, Binney, Proc. B. S. N. H., 1841, 52. 



, W. G. Binney, Man. Am. Land Shells, 237, fig. 257, (1885). 



, Walker, Rev. Moll. Fauna Mich., 16, (1894). 



Common and of general distribution. 



Family ENDODONTID^. 



Shell with opaque, brown coloring or flammules, usually rib-striate, the 

 hp thin, unexpanded and sharp. Marginal teeth with wide, short and squar- 

 ish basal plates, with one or several cusps, the outer cusp never elevated on 

 middle cusp. 



KEY TO SUBFAMILIES OF ENDODONTIDM. 



I. Jaw arcuate, its component laminse compactly soldered together 



Endodontince. 



II. Jaw arcuate, composed of numerous, separate, rhomboidal, more or 

 less overlapping plates connected by membrane only Punctince. 



Subfamily ENDODONTIN/E Pilsbry. 



Jaw formed of overlapping laminse partially soldered together, or solid 

 and vertically striated. 



KEY TO GENERA OF ENDODONTINCE. 



I. Shell broadly umbilicate, spire conoidly depressed or flattened, lack- 

 ing internal teeth on outer wall of the body whorl Pyramidula. 



II. Shell discoidal, body whorl with internal teeth on outer wall ar- 

 ranged in pairs Helicodiscus. 



Genus PYRAMIDULA Fitzinger. 



Shell openly umbilicated, varying 

 in contour from flattened to conoidal. 

 Generally opaque, often rib-striate. 

 Unicolored, spirally banded or flam- 

 mulate. Whorls subcylindrical or 

 keeled, the apex generally smooth. 

 Aperture rounded-lunate; lip simple 

 and thin. 



Animal having the sole undivided; 

 Fig. 76. Animal of P. soiitaria. (Binney.) lateral margin of the foot with a dis- 

 tinct border bounded by a groove, the grooves meeting above the tail, no 

 caudal mucus pore; eye-peduncles long and slender. 



Jaw arcuate, its component laminse generally compactly soldered 

 Fig. 77. and indicated only by fine striae, which diverge slightly from the 



JawofP.aZ<er-niiddl#. 

 nata. (i3inney.) 



Radula having the centrals unicuspid or tricuspid; laterals unicuspid or 

 bicuspid, marginals bicuspid or multicuspid, with low, wide basal plate. 



