CAM^ENA. 265 



Genus CAMJENA (Alb.) Pils. & Mlldff. (Vol. VI, p. 197.) 

 Gamcena PILS., Proc. Acad. Nat. Sci. Pbila. 1892, p. 398. 



(Typical group.} 



C. PACHYCHILA Smith. PL 52, figs. 50, 51, 52. 



Shell large, umbilicated, thick lens-shaped, solid, carinated at the 

 periphery. Ground color light yellow, becoming darker and red- 

 dish-brown on the spire ; the last two whorls adorned with many 

 narrow dark red-brown spiral lines, a more intense line bordering the 

 keel below. 



The surface is densely granulated above and below, and on the 

 last whorl it is malleated in places. Embryonal whorls 2}, shining, 

 convex, arcuately plicate-striate ; measuring about one-seventh the 

 diameter of the mature shell. The junction of embryonal shell with 

 the after-growth is distinctly marked ; the latter being sculptured 

 with microscopic spiral lines and granules, and being flatter, wider, 

 and on account of the acute carination the suture appears slightly 

 margined above. Post-embryonic whorls 3, but little convex, sepa- 

 rated by superficial sutures. The last whorl is acutely carinated, 

 the carina becoming obsolete on the latter third of the volution, and 

 not modifying the rounded contour of the outer lip ; base convex, 

 curving rapidly into the large, cylindrical umbilicus, which is 

 banded inside. 



Aperture oblique, lunate-oval, purplish-white within, and showing 

 the external color-bands as purple lines which continue to the edge 

 of the lip. Peristome well expanded above and outwardly, broadly 

 reflexed below, its face convex ; columellar insertion broadly dilated, 

 concealing a small part of the umbilicus. 



Alt. 30, greatest diam. 55, lesser 44 mill. 



Annam. 



Helix pachychilus E. A. SMITH, MS. 



This species is allied to C. ochthoplax and saturnia, and more to C. 

 leonhardti. From the former it differs in the distinctly granulated 

 sculpture and somewhat in the coloration, which resembles C. hai- 

 nanensis, longsonensis, etc. 



C. LONGSONENSIS Morlet. PL 29, figs. 88, 89. 



Shell sub perforated, discoidal, depressed, thin, covered with a buff 

 epidermis ; ornamented with growth-striae and rough, oblique, irreg- 



