188 UROCOPTIS, S. G. GONGYLOSTOMA. 



panded, Isabella tinted. Axis rather stout, with two lamellse, 

 the upper one a stout rounded cord, the lower narrow and 

 spinose at the acute edge; in the intermediate whorls a low 

 rounded cord revolves below the denticulate lamella. In the 

 fifth whorl from the base the cavity is narrowed by a very 

 strong, outward-flaring lamella hanging from the upper or 

 parietal partition, and a corresponding, much lower plica on 

 the floor or lower partition, each being fully one whorl long. 



The young shell, according to Pfeiffer, is long and very 

 slender, acutely produced, composed of about 12 whorls. 



Length 11.5, diam. 2.5 mm.; whorls 12. 



Length 10, diam. 2.7 mm. ; whorls 10. 



Length 12, diam. 2.75 mm.; whorls 12 (Pfeiffer's type). 



Eastern Cuba: Yateras, Guantanamo (Gundlach) ; Yacabo- 

 arriba, Baracoa (Arango). 



Cyl. ornata Gundlach mss., PFR., Malak. Bl., vi, 1859, p. 97 ; 

 Monogr., vi, p. 382. BINNEY, Ann. N. Y. Acad. Sci., iii, p. 

 126, pi. 14, f. A (dentition). ARANGO, Contrib., p. 122. 

 Urocoptis (Sectilumen) ornata Gundl., PILS. & VAN., Proc. 

 A. N. S. Phila. 1898, p. 276, pi. 17, f. 9 (interior). 



Externally this species resembles U. (Maceo) interrupta. 

 Internally it has much in common with the typical section 

 of Holospira (see pi. 21, 22). The lower or basal plica is 

 sometimes weak or obsolete ; and the outer wall of the con- 

 stricted whorl is decidedly thickened, thicker than in pre- 

 ceding or following whorls, and bears a median low callus or 

 cord, corresponding to that of Holospira. The finely den- 

 ticulate axial lamella persists in the early whorls, the upper 

 cord-like one being low or subobsolete there. There is indi- 

 vidual variation of fully a half whorl in the number of whorls 

 formed beyond the obstructed one. Figures 37 and 38 repre- 

 sent front and back views of the same shell. 



Section Esochara Pils. & Van., 1898. 



Esochara P. & V., Proc. A. N. S. Phila. 1898, pp. 271, 276, 

 type U. strangulata. 



Urocoptis with two axial lamellae (the upper one sometimes 

 vestigial), the lower denticulate in the upper whorls, then 



