MUSEUM OF COilPARATIVE ZOOLOGY. 



APPENDIX. 



Arionta intercisa, W. G. Binn. Mr. Henry Hemplaill has lately sent me 

 alcoholic specimens of this species, collected by him at San Clemeute Island, 

 California. 



The jaw is as usual in the genus, with six separated ribs. 



The lingual membrane is as usual in the genus. Teeth 31-1-31, with about 

 15 laterals on each side. The extreme laterals only are bicuspid. 



The genitalia are like those figured by me for Eupunjpha Trijoni. (See Terr. 

 Moll. U. S., V.) 



From the series of specimens sent by Mr. Hemphill, I am inclined to believe 

 Arionta redimita to be a variety of intercisa. The original specimen may have 

 come from the same locality. Formerly I suspected redimita to be a variety of 

 ramentosa. 



NOTE OX THE GENEEA OF SLUGS. 



Having had occasion to describe several genera of naked terrestrial mollusks, 

 I add here, for the sake of comparison, a list of known genera with their 

 generic characters, as far as they can be ascertained. It is difficult to draw the 

 line between the slugs and the snails. I have not included Succinea, Helutaga, 

 AmphibuUma (Pellicula), Vitrinopsis, Vitrinizonites, which have some claim to 

 be considered sublimaciform. I have included Binneya and Laconia, which 

 should, perhaps, be considered as subheliciform. 



AGNATHA. 



Testacella, Cdv. Animal limaciform, subcylindrical, tapering anteriorly : 

 tentacles simple : mantle small, posterior, quite near tail, covered with a 

 small external shell : no longitudinal furrows above the margin of the foot, 

 and no caudal mucus pore : no distinct locomotive disk : external respiratory 

 and anal orifice at the posterior right edge of the mantle under peristome of the 

 shell: combined generative orifice behind and below the right eye- peduncle- 

 Shell external, rudimentary, imperforate, ear-shaped, with a subspiral, pos- 

 terior, unibona nucleus. 

 No jaw. 



Lingual membrane with no central tooth ; others aculeate, apex hooked. 

 Eastern Europe, TenerifiFe, Madeira. 



For figure of animal and shell, see Moquin-Tandon, Moll. Terr, et Fluv. 

 de la France. 



