420 A MANUAL OP AMr^EIOAN LAND SHELLS. 



Pupa mnmia, Potiez and Michaud, Gal., i, 169, pi. xvii, figs. 1-2 (teste Pfr.). 



Piqia iiiarUima, y, Pfeiffeu, Mon. Hel. Viv., iii, 539. — Gould, in Terr. Moll., i 1,3 16. 



I'upa detrita, Shuttleworth, MS., Pfeiffer, in Mai. Bliitt., i, 158 (1853) ; i, 205 (1854), 



pi. iii, tigs. 9, 10. 

 Strophia iucana, W. G. Binney, Terr. Moll., v, 220. 



A Cuban and Baliamas species, found in the Florida Subregion, 

 both on the southern part of the mainland and on the keys from 

 Cai)e Florida to Key West ; ;]6™'" long, in Boca Chica Key (Hempliill). 



Animal wliitish, brownish, smoky, or nearly black, darker on the 

 back and upper part of head. Body finely granulated, the granules 

 arranged in regular lines longitudinally, making the surface look as if 

 minutely and longitudinally furrowed. Eye-peduncles rather short, 

 slender, bulbous at the extremities ; tentacles very short. 



This species is found plentifully at Key West, where it inhabits low 

 grounds near salt-water ponds. It attaches itself to saline plants, a 

 few inches from the soil. At other times it retreats under stones. It 

 is probably confined to the vicinity of the ocean. It has also been 

 found on other neighboring keys, and on the mainland from Key 

 West to Cajie Florida. The animal varies much in color; it is shy 

 when kept in confinement. In winter it forms a membranous epi- 

 l)hragm. 



The general appearance of this shell is cylindrical, with both extrem- 

 riG. 465. ities obtuse. The width of the central whorls is nearly uniform ; 

 ^^ the upper only become gradually narrower to the apex. The 

 number of whorls is usually about 9, but sometimes 12; and 

 the progressive increase of the width, of the whorl, in revolving 

 from the apex to the aperture, though regular in each specimen, 

 differs so much in different specimens, that 'some shells are 



S iucana, 



var. very short and robust, while others are long and fusiform. 

 The whorls are nearly flat, the surface shining and marked with num- 

 erous angular strife, which on the back and last whorl attain some- 

 times the prominence of wrinkles. The peristome is often very thick ; 

 it is not added until the shell has acquired at least seven or eight full 

 volutions. The outline of the external aperture is an oval, whose great- 

 est diameter is parallel with the axis of the shell, truncated obliquely 

 by the columellar margin ; internally it is modified by a lamellar tooth 

 or fold on its superior parietes, and another marking the depression of 

 the axis; when these are prominent the outline of the throat of the 

 ai)erture is somewhat trilobate. One or both of the teeth are some- 

 times wanting. The apex of the spire is corneous. Its color is chalky 

 or horny white, with frequently a livid brown tint beneath. 



i 



