22 ENDODONTA. 



KEY TO SUBGENERA. 



a. Aperture provided with teeth, folds or spiral lirse. 



b. Parietal callus elevated at edge into a transverse lamella ; 

 base glossy, 



Brazi&ria. 



bb. Teeth or lamellae internal, spirally entering or tubercular, 

 c. Form elevated conical ; columella calloused, Diglyptus. 

 cc. Form not high conic, diam. greater than alt. ; no heavy 

 columellar nodule. 



d. Umbilicus pouch-shaped, wide within, constricted at 

 opening, . Libera. 



dd. Umbilicus not pouch-shaped, open or imperforate, 



Endodonta. 

 aa. Aperture lacking teeth, internal folds or lirse. 



b. Spire elevated, the alt. nearly equalling or exceeding the 

 diam. 



c. Shell cylindrical, pupiform, Phenacharopa. 



cc. Shell convex-conoidal or thimble shaped, hairy, 



Aeschrodomus. 



ccc. Shell pyramidal-conic, spirally sculptured and pitted, not 



hairy, Paratrochus. 



bb. Spire depressed, convex, flat or concave ; diam. much 



exceeding the alt., Charopa. 



Subgenus DIGLYPTUS Pilsbry, 1893. 



Diaglyptus PILS., Manual viii, p. 86, not Diaglypta Foerst, Verh. 

 Ver. Rheinl. xxv, p. 176 (Insecta.) 



? Pitys BECK, Index Molluscorum, p. 9, 1837 (name only), type P. 

 oparana B. (undescribed). M<ERCH, Catal. Yoldi, p. 6, 1852 (no 

 description ; H. bilamellata Pfr. mentioned.) 



Not Pitys PEASE, P. Z. S. 1871, p. 450. 



Shell elevated-trochiform, rather narrowly but openly umbilicated, 

 the two apical ivhorls spirally striated the remaining whorls strongly 

 obliquely ribbed. Aperture armed with a strong entering parietal 

 lamella, and two close columellar plicre terminating in a large callous 

 nodule on the columellar lip ; peristome expanded below. Type 

 Helix bilamellata Pfr.,=pagodiformis, pi. 5, fig. 54. 



Auatomy unknown. The single species inhabits the island of 

 Opara, one of the Austral group. It was doubtless derived from the 



