412 A MANUAL OF AMERICAN LAND SHELLS. 



wider tbau Ligh, witli one inner, large, and one outer, small palmate 

 cusp J the two pedicles are quite wanting. 



Cylindrella Pocyana, D'OnniGXY. 



Shell very long, thin, horn-colored or whitish, loiigiliidiiially strongly 

 Fig. 452. ^ striated; spire very long, inliated, aciiininate behind 

 truncated; whorls 11, rather convex, the last carinated 

 before; aperture round; peristome acute and continu- 

 ous, in contact with the preceding whoil. Axis simple. 

 Length, 15""" ; breadth, 1""". 



v Pupa /'oe_!/flHa,D'ORBiGXV, Moll. Cuba, i, 1.^5, pi. xii, figs. 24-26. 

 Cylindrclla Foeyana. CijUndreUa Foeiiana, Pfeikkeu, Moii. Hel. Viv.. ii, :3.-0. — Chemnitz, 



od. 2, 20, pi. iii, figs. 29-31.— W. G. Binxky, T. M., iv, 141>; v, 382 ; L. & Fr.- 



AV. Sh., i, 22(18t;U). 

 CiiUndrella ladaria, Got'LD, in T. ]\I , pi. Ixix, fig. 2, not in text. 

 Goiigylobtoma roeyana,TiiYO'S, Am. Jouru. Conch., iii, 311 (I'-^tW). 



A Cuban species, found also in the Florida Subregion, both on the 

 mainland in the Miami country and on Key West and other keys. 



Animal white, with a dark line along the back of each eye peduncle, 

 one along the median line, and a \ery delicate one along each cheek; 

 ocular points large and black. 



The description in the Terrestrial Mollusks is drawn fiom C. hictaria, 

 Gould, which is identical with varur/ata, Pfeiffer, and is characterized 

 by tiexuose, milk-white lines and more delicate striiie. 



The apical nucleus of the shell is a small globule ; this is succeeded 

 by a large number of closely revolving whorls of still smaller diamt ter, 

 which scarcely augment in length, and then there is a rapid dilatation 

 to the full size of the shell. At this part, either by fracture or more 

 probably by absorption, the slender tip is thrown off, so that we have 

 only the truncated lower portion left. 



The animal is very small compared with tbe shell, being less than 

 one-fourth the length of the shell, which it carries with its axis nearly 

 horizontal, and in the line of motion, with api)arent dithculty. The 

 snout is thrown forward and firmly attached at every undulation, 

 simultaneously with the contraction of the posterior extremity. When 

 the curve flowing along the sides of the loot reaches the head, the at- 

 tachment of the snout is released, and it is again thrown forward and 

 fixed as before. 



Jaw as usual in the genus, with about 40 deli'^ate ribs. 



Lingual membrane (see Fig. 451) as described above; teeth 14-1-14. 



Genitalia not examined. 



