112 A MANUAL OF AMERICAN LAND SHELLS. 



ting margiu witliout median projection ; anterior surface with about 14 

 crowded, stout, irregularly developed ribs, denticulating either margin 

 (Fig. 77). 



Lingual membrane (Terr. Moll., V, Plate V, Fig. J) long and narrow. 

 Teeth 23-1-23, with 11 perfect laterals. Centrals with a quadrangular 

 base of attachment, higher than wide. Eeflection about half as long 

 as the base, with a long, narrow median cusp reaching tlie lower 

 margiu of the base of attachment, beyond which projects slightly the 

 short cutting point ; side cusps but little developed, but bearing short, 

 stout, triangular cutting points. Laterals like the centrals, but asym- 

 metrical by the suppression of the inner, lower, lateral angle of the 

 base of attachment and the inner side cutting point. First marginal 

 (/>) with a square base of attachment, broadly reflected into a stout 

 cusp, bearing an inner, stout, very long, bluntly ending, oblique cut- 

 ting point and a small outer cutting point. Outer marginals (c) low, 

 wide, the reflection broad, reaching the lower edge of the base of at- 

 tachment, and bearing one inner, long, oblique, blunt cutting point 

 and a small outer cutting point. 



The genitalia are figured (Terr. Moll., V, Plate XII, Figs. J, K). 

 The testicle is composed of a large globular mass of aciniform caeca. 

 It lies loosely upon, not imbedded in, the upper lobes of the liver. The 

 ovary and oviduct are as usual. The genital bladder is globular, very 

 large, on a short, stout duct, entering the vagina near its base. The 

 penis sac is long, cylindrical, larger towards its apex, where both the 

 retractor muscle and vas deferens enter. In several specimens exam- 

 ined the penis sac appeared somewhat different. It had a large glob- 

 ular bulb at its apex. The vas deferens entered beyond the middle 

 of the length of the sac; it was greatly swollen before entering the 

 sac, for a distance equaling about one-half of the length of the sac. 

 At the commencement of this swelling the retractor muscle was in- 

 serted. This form of penis sac is figured in Fig. K. 



The balance of the anatomy of HempMllia seems to be as in the 



other slugs. 



GOXOSTOMA, Held. 



Animal as in PaUda. 



Shell umbilicated, orbicularly depressed, arctispiral, often lightly 

 hirsute; whorls 5-7, gradually increasing, the last angular or acutely 

 carinated above ; aperture oblique, narrow, lunate, quite often sinuous ; 

 peristome reflected, thickened, often heavy ; parietal wall without tooth- 

 like processes. 



