104 A MANUAL OF AMERICAN LAND SHELLS. 



PROPHYSAORT. 



Animal limaciform, attenuated behind. Mantle anterior, small, ob- 

 tuse before and behind, its margins free as far back as the cleft for the 

 1^10.68. respiratory orifice, inclosing a 



simple, not sjiiral, subhex- 

 agonal shell, which is longer 

 than wide. A longitudinal 

 line around the animal just 



distinct locomotive disk to foot, but crowded, oblique furrows running 

 from center to edge. Eespiratory and anal orifices on the right margin 

 of mantle, slightly in advance of its center, with the usual cleft to the 

 edge. Genital orifice behind and below, but quite near to the right 

 eye-peduncle. No caudal mucus pore. 

 Jaw of the single species known, P. HempMlU, thick, low, wide, 

 TTG^.g. slightly arcuate, with but little attenuated ends, 



cutting margin without median projection ; an- 

 terior surface with 15 stout, irregularly devel- 

 oped, separated ribs, denticulating either mar- 



Jnw of p. HemphilU. gin. 



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

 Teeth about 40-J-40, with 16 perfect laterals. Centrals with a base of 

 attachment longer than wide, reflection extending less than one-half 

 the length of the base, with a very stout, short median cusp, bearing 

 a stout, short, blunt cutting point, and on either side a subobsolete 

 cusp bearing a stout, bluntly rounded, short cutting point. Laterals 

 like the centrals, but asymmetrical, as usual, by the suppression of the 

 inner side cutting point and inner lower, lateral expausion of the base 

 of attachment. Marginals (ft) low, wide, with one inner, stout, ob- 

 lique cutting point and two outer, smaller, blunt cutting points. As 

 in all lingual membranes, there is a difl'erence in the development of 

 the cusps and cutting points on various parts. The teeth figured are 

 the least graceful in their outlines. 



Found in the Pacific Province, in Oregon and California. Mr. Henry 

 Hemphill, in whose honor the genus is named, has collected specimens 

 from Astoria to San Francisco Bay. 



This genus agrees with Limax by having an internal shell, and by the 

 position of the genital orifice. It differs by its ribbed jaw, by the sub- 



