CRYPTOSTRACON, PROPHYSAON, ANADENUS. 249 



Genus CRYPTOSTRACON, W. G. Binney, 1879. 



C. GABBI, W. G. Binney. PI. 45, figs. 26,' 21, 22. 



Animal varying from black to shades of brown, and variously 

 mottled with black or dark brown ; usually a little greenish over 

 the shell, darkest posteriorly. Length, 3-25 inches. 



Internal shell rudimentary with concentric growth-lines ; very 

 membranous; about two whorls are indicated. Length, 14 mill. 



Flanks of Pico Blanco, Costa Rica, 



elev. 5000 to 7000 feet. 



Genus PROPHYSAON, Bland and Binney, 1873. 



P. HEMPHILLI, Bland and Binney. PL 45, figs. 29, 30. 



Mantle granulated, whitish, with a circular ring of smoke- 

 color above the respiratory orifice ; body obliquely reticulated 



with bluish lines, the reticulations larger (about twelve) below 

 each side of the mantle, more numerous and smaller on the pos- 

 terior extremity of the body ; these reticulations are subdivided 

 by irregularly disposed, rounded tuberosities, with colorless 

 interstices. Above the foot, from the longitudinal line running 

 around the animal to the edge of the foot, are perpendicular 

 lines or furrows, also bluish in color. The sole has crowded 

 wrinkles running obliquely backwards from its centre to its 

 margins. Length of an alcoholic specimen, 40 mill. 



The internal shell differs in thickness, but is always well- 

 marked, sometimes suboval, sometimes subhexagonal, always 

 longer than wide. 



Differs from Ariolimax in having no mucous pore, but on this 

 subject see remarks under A. Andersoni, p. 247. The latter, as 

 described by Dr. Cooper, may belong to this species, or is closely 

 related to it. 



Genus ANADENUS, Heynemann, 1863. 



A. ALTIVAGUS, Theobald. PI. 59, figs. 62, 63. 



Shell slightly granular, back rugosely reticulated ; color 

 greenish brown or yellowish brown ; head and tentacles blackish. 



Length, 6 to 9 inches. 



Shell internal, thin or flat, sometimes very thick. 20 mill, 

 long, 12 mill. wide. Sikkim, Himalayas, 6000 to 9000 feet. 



It is A. giganteus, Heynemann. 



