1898.] NATURAL SCIENCES OF PHILADELPHIA. 235 



Binneya has an appendicula, the penis retractor is inserted on the 

 lung floor, and the retensor muscle is weak, while in Hemphillia 

 there is no appendicula and the penis retractor is inserted on the 

 surface of the very broad and strong retensor. The digestive tract 

 is considerably alike in the two genera. 



Key to species of Hemphillia. 



a. Mantle papillose; tail acutely keeled above, terminating in a 

 fleshy horn which overhangs the caudal pore ; pedal furrows 

 scarcely rising at their union behind. Penis with a bifid inter- 

 nal process inserted at the apex of the cavity ; spermatheca glob- 

 ular, on a comparatively slender duct; penis retractor muscle 

 inserted upon the epiphallus, H. glandulosa. 



a. Mantle slightly rugose, not papillose ; no horn at tail ; pedal 

 grooves abruptly rising behind, meeting over the tail. Penis 

 with a simple fleshy process inserted at the base of the cavity ; 

 spermatheca small with a very stout duct ; penis retractor muscle 

 apical on penis, H. camelvs. 



H. glandulosa Wand & Binney. PI. IX, figs. 1,2; PI. XII, figs. 49, 50. 



Hemphillia glandulosa Bland & Binney, Ann. Lye. Nat. Hist, of N. Y. , X, 

 p. 209, pi. ix, f. 1, 3 (exterior), 5 (shell), 15-17 (teeth), Terr. Moll., V, p. 

 248, f. 144-140, pi. y, f. J (teeth), pi. xii, f. J, K (genitalia) ?. Man Amer. 

 Land Shells, p. Ill, f. 75-77 (78?). Supplement toT. M., V, pi. iii, f. H (?). 

 Third Supplement, p. 211, pi. iv, f. D. Pilsbry & Vanatta, Nautilus XI, p. 

 44. 



Color in alcohol blackish above, or yellowish with black spots ; 

 the edge of mantle, sides of foot below mantle, foot-margin and sole 

 yellowish ; shell yellow. Mantle extension densely papillose in; 

 front of the shell and at sides. Breathing pore median on the right 

 side. Genital orifice near right tentacle, a groove running from it 

 toward the breathing pore. Foot obliquely grooved and rather 

 coarsely reticulated, pinched up into a high, acute keel posteriorly, 

 this keel declining and terminating in a prominent horn-like process 

 at the end. Foot-margin rather wide, vertically grooved as usual. 

 Pedal furrows scarcely rising at the tail, meeting in a caudal pore 

 immediately below the " horn." Sole transversely wrinkled, the 

 wrinkles bent backward mesially, as in Prophysaon. Length 10 to 

 13 mm. 



Shell convex, with yellow cuticle, thin calcareous layer and pos- 

 terior nucleus. 



Genitalia (PI. XII, figs. 49, 50) with the penis enormously swollen,, 

 its lumen filled by a bifid, fleshy, imperforate, corrugated body 

 16 



