364 BULLETIN OF THE 



Prophysaon, Bland & Binn. Animal limacilorm, subcyliinliical, taper- 

 ing behind: tentacles simple: mantle small, anterior, concealing a shell-plate : 

 no longitudinal furrows above the margin of the foot, and no caudal luucus 

 pore : no distinct locomotive disk : external respiratory and anal orifices on the 

 right anterior margin of the mantle ; orifice of combined genital system behind 

 and below the right eye-peduncle. 



Internal shell-plate thick, small, flat, longer than wide. 



Jaw ribbed. 



Lingual membrane with tricuspid centrals, bicuspid laterals, and quadrate 

 marginals. 



Pacific Coast of United States. 



Pallifera, ^Iorse. Same as Tehennophorus, but with ribbed jaw. 



In Hemitrochus and Dentellaria the presence or absence of ribs on the jaw is 

 surely not a generic character. It may be, therefore, that Pallifera is identical 

 with Tehennophorus. 



Veronicella, Blain. {Vaginula, Fer., not Vaginuhis, Stolicska, q. v.) 

 Animal limaciform, elongate-ovate, rounded above, flat below, margins ex- 

 panded : tentacles bifid, unequal, contractile : mantle covering the whole back : 

 no longitudinal furrows above the margin of the foot, and no caudal mucus 

 pore : no distinct locomotive disk : external respiratory orifice connecting with 

 a tube to the anal orifice at the extreme posterior under part of the animal ; 

 orifice of male genital organ at the base of the right tentacle, of the female 

 organs at the middle of the right under-side of the animal. 



No internal shell or plate. 



Jaw with numerous ribs. 



Lingual membrane quite peculiar, marginals quadrate. 



For figure of animal, jaw, and lingual dentition, see Terr. Moll. U. S., V. 



Asia, Africa, South and North America, in warm latitudes. 



Binneya, J. G. Coop. {Xanlhonyx, Cr. & Fisch.) Animal sublimaciform, 

 blunt before, tapering behind: tentacles simple: mantle subcentral, covered by 

 a shell, with an anterior expansion : no longitudinal furrows above the margin 

 of the foot, and no caudal mucus pore : a distinct locomotive disk : external 

 respiratory and anal orifices on the right posterior margin of the mantle, under 

 the peristome of the shell ; orifice of combined genital system behind and 

 below the right eye-peduncle. 



Shell external, paucispiral, auriform, not enclosing the animaL 



Jaw ribbed. 



Lingual membrane with tricuspid central teeth, bicuspid laterals, and quad- 

 rate marginals. 



Mexico and islands off southern coast of California. 



The animal has the peculiarity during estivation of forming a testaceous 

 covering extending from the peristome over the parts not protected by the shell. 



The body is not attached its whole length to the foot, the viscera forming a 

 turbinate spiral mass, partially protected by the shell. 



