LTROCOPTIS, S. G. GONGYLOSTOMA. 229 



stome white, equally reflexed all around. Internal column 

 encircled by two thread-like, but slightly projecting folds. 

 Length 15, diam. 3.33 mm.; aperture diam. 2.5 mm. (P/V.). 



Western Cuba: Plantation Camiabaco, at the foot of El 

 Palenque, a hill in the western part of prov. Matanzas, under 

 stones, .(Gundlach). 



Cyl. fumosa Gundl. mss., PFR., Malak. Bl., xi, 1863, p. 5; 

 Monogr., vi, p. 375. ARANGO, Contrib., p. 118. 



Near U. fortis in shape and sculpture, but very different 

 in internal structure. I have not seen specimens. 



103. U. ANGUSTIOR ('Wright' Pfr.). PI. 59, figs. 79, 80, 81. 



Shell very slenderly subfusiform, the last three normal 

 whorls of about equal diameter, those above tapering in a 

 muck attenuated, usually entire spire to the globose, smooth 

 apex; thin, corneous, somewhat transparent, brown above. 

 Surface glossy, finely and regularly striate, the strias as wide 

 as the intervals. Whorls convex, the last free, the free por- 

 tion straight, produced downward and forward. Aperture 

 oblique, subcircular, the lip continuous, expanded and some- 

 what reflexed. Axis slender, encircled by two delicate 

 lamellae, the lower one weakly denticulate, the upper lamella 

 smaller, obsolete in the later whorls. 



Length 15.5, diam. 2.5 mm. ; whorls 19y L . ) Cayos de 



Length 13, diam. 2.4 mm. ; whorls 17. j S. Filipe. 



Length 14, diam. 2.33 mm.; whorls 18-19 (Pfr., type). 



Length 17.5, diam. 2.5 mm.; whorls 18y 2 (El Guania). 



Western Cuba: Cayos de San Filipe, district of Vinales, 

 Pinar del Rio (Wright) ; El Guania, Pinar del Rio (Arango). 



Cyl. augustior Wright mss., PFR., Malak. Bl., xi, 1864, 

 p. 130; Monogr., vi, 384. ARANGO, Contrib., p. 124. Not 

 of SOWERBY, C. Icon., xx, pi. 11, f. 97. 



Allied to U. capillacea, distincta, etc., but more slender, 

 retaining all or most of the spire, which is strongly attenuate 

 above. In some specimens the upper axial lamella is almost 

 or quite obsolete. Mr. Sowerby has figured some other spe- 

 cies for this one. but it is quite impossible to tell what. 



