1898.] NATURAL SCIENCES. OF PHILADELPHIA. 231 



muscles, genitalia and alimentary canal are unknown, and the types 

 though in alcohol, have been dried. 



B. notabilis J. G. Cooper. PI. XIV, figs. 63, 64, 65 ; PI. XVI, figs. 87, 88. 



Binneya notabilis J. G. Coop., Proc Cal. Acad. Sci., III, p. 62, figs. 15, in 

 text. Tryon, Amer. Journ. Conch., II, p. 244, pi. 3, f. 4 (copied from Cooper). 

 W. G. Binney, Land and Fresh-water Shells of N. A., I, p. 68, f. 112. Terr. 

 Moll., V, p. 245, f. 141-143; pi. V, f. K (teeth), pi. xi, f. B (genitalia). 

 Man. Amer. Land Shells, p. 10S, f. 71-74. Fourth Supplement to Terr. Moll. 

 V, p. 184, pi. 1, f. 9 (shell). 



Alcoholic specimens measure about 10 mm. long to double that 

 length ; color buff-gray with rather large black dots mainly scattered 

 along the radial grooves of the foot and in a line above the pedal 

 grooves, the mantle maculated with black. Surface with rather 

 coarse radial grooves and sparse reticulation ; a fine groove median 

 on tail above, not extending to the end ; foot margin narrow, closely 

 and evenly crenate ; sole unicolored grayish, rugose and distinctly 

 tripartite. 



Jaw (PI. XVI, fig. 87) and dentition (PI. XVI, fig. 88) described 

 above. 



Digestive and muscular anatomy described above. Our spec- 

 imens were sexually immature, so that the description of genitalia 

 is taken from Binney, Crosse, Fischer, Strebel and Pfeffer. 



Distribution : Santa Barbara Island, off California ; Guadalupe 

 Island, off Lower California. 



Genus HEMPHILLIA Bland & Binney, 1872. 



Hemphillia Bland & Binney, Ann. Lye. N. H. of N. Y., X, p. 208 (1872), 

 type H. glandidosa B. & B. 



Slug-like, with the mantle conspicuously elevated (in alcoholic 

 specimens) into a nonspiral visceral hump; the shell a slightly 

 convex, non-spiral plate partially exposed, its edges buried in the 

 mantle, which is very broadly produced beyond the shell on all 

 sides. Breathing pore behind the middle of right margin of 

 mantle. Genital orifice behind the right tentacle. Foot radially 

 grooved and reticulate above, the foot margin wide, conspicuous ; 

 pedal furrows deep, meeting in a mucous pore at the tad, or without 

 tail gland. Sole not in the least tripartite. 



Viscera elevated into the dorsal hump, the body-cavity not extend- 

 ing back of it into the tail, which is solid. 



Jaw low, wide, with about 14 low wide ribs with shallow intervals, 



Radula with tricuspid central, bicuspid lateral and marginal 

 teeth, the inner cusp (mesocone) of the latter long. 



