THE NAUTILUS. 127 



curved, as wide as ilieir intervals. Sutures rather deep, wliorla 

 slightly convex, the hist rounded below, very shortly free in front. 

 Tiiu aperture is somewliat oblique, shortly oval, a little longer than 

 wide. Peristome continuous and free, very little expanded, some- 

 what thickened, narrowly reflected. Axis bears one thin, minutely 

 crenulated spiral lamella. 



Length 14, diam. 3 mm.; 13 whorls. 



Length 12, diam. 2.6 mm.; 13^ whorls. 



UrOCOPTIS (GoNGYLOSTOMA) CIENFUEGOSENSIS, n. sp. PI. VIII, 



figs. 6, 7, 8. 



The shell is cylindrical, the upper jialf or third tapering to a 

 rather small truncation ; white, mottled and streaked with corneous- 

 gray, as in U. variegata ; glossy. Sculpture of rather low, coarse 

 rib-striae, closer and siiarper on the tapering whorls and on the neck 

 behind the lip. "Whorls sliglitly convex, the last rounded below, 

 very shortly \'reQ in front. The aperture is slightly oblique and a 

 little longer than wide. Peristome white, expanded and reflected, 

 continuous and free. Axis encircled by a small, thin, minutely 

 serrate lamella. 



Length 15, diam. 3.1 mm.; 13 whorls. 



Length 12.5, diam. 3 mm.; 12 whorls. 



" Lagunilla," a place about G miles due north from Clenfuegos, 

 where there are several small brackish lagoons. 



This species has much external resemblance to U. poeynna lucteO' 

 flua Pils. It is most closely related to U. canteroiana Arango, from 

 which it differs by the variegated coloration, weaker ribs and smaller 

 axial lamella. It is the only species of Urocoptls I found in the en- 

 virons of Clenfuegos. The small lagoons at Lagunilla are slightly 

 salt to the taste. The rocks and sticks are thickly coated with 

 Congeria, and there is also Neritina virginea. 



MiCROCERAMUS SANCTISPIRITENSIS, H. Sp. PI. VIII, figs. 11, 

 12, 13. 



The shell is shortly rimate, oblong-territe, tapering from the last 

 or the penult whorl in a long cone which is slender and straight- 

 sided above. Ground color brownish-corneous, becoming gray- 

 corneous on the last whoil, the apex whorl or whorls brown or gray 

 subsequent whorls with sculpture of rib-strisE which are white except 



