UROCOPTIS, S. G. GONGYLOSTOMA. 189 



expanding in a broad plate bisecting the cavity in one or two 

 submedian whorls, reduced again below. 



In U. fabreana the teeth (pi. 61, figs. 13, 14) are larger than 

 in any other species of the family I have examined. The 

 centrals are narrow, almost as in Idiostemma. 



This group of western Cuba has apparently been special- 

 ized from an ancestral species belonging to Gongylostoma 

 s. str. Its peculiar internal structure was noticed first by 

 Poey. 



Key to Species of Esochara. 



I. Last whorl very shortly free in front; suture simple; 

 shell rather large. 



1. Brown, the length about 3% times the diam. ; two 

 axial lamellae in the upper whorls. 



U. strangulata, no. 58. 



2. Dull corneous or pale, the length 4 or 5 times the 

 diam. ; one axial lamella in the upper whorls. 



U. fabreana, no. 59. 



II. Last whorl produced in a long, descending neck ; suture 

 bordered below by white bosses; shell small. 



U. teneriensis, no. 60. 



58. U. STRANGULATA (Poey) . PI. 52, figs. 28, 29, 30. 



Shell cylindric, the upper third rather rapidly tapering to 

 a wide truncation; thin; dull brown. Surface lustreless, 

 sculptured with oblique riblets separated by intervals of three 

 or four times their width. Whorls slightly convex, the last 

 rounded beneath, with a low cord-like basal carina, very 

 shortly free in front. Aperture subcircular, but the upper 

 external margin is noticeably straightened. Peristome thin, 

 expanded and narrowly reflexed. Axis with two spiral la- 

 mellae above, the lower one expanding in a broad, flat plate 

 or spiral disk in the antepenult, and next earlier whorls, 

 nearly reaching the outer wall of the cavity. In the last 

 whorl the upper lamella is reduced to a rounded cord. 



Length 22, diam. 6 mm. ; whorls 



Length 19, diam. 5.7 mm. ; whorls 



Western Cuba: Lomas de Candela, near Guines, prov. 

 Habana (Gundlach). 



