UROCOPTIS, S. G. GONGYLOSTOMA. 199 



thread-striate, straw colored. Spire long, a little more swol- 

 len in the middle, the apex generally truncate, whorls 15-16 ; 

 rather flattened, the last shortly free, not carinate. Aperture 

 subcircular; peristome white, equally reflexed throughout. 

 Suture deep, not crenulate. Internal column strong, pro- 

 vided with three equal, parallel lamellae. (Arango.) 



Length 14, diam. 3 mm. (spire entire). 



Western Cuba : * ' La Jagua, ' ' near La Palma, dist. of Con- 

 solacion del Norte, in Pinar del Rio, on the plantation of D. 

 Rafael Azcui (Arango). 



Cyl. triplicata ARANGO, Proc. A. N. S. Phila. 1882, p. 105. 



11 Differs from all Cuban Cylindrellas by the form of the 

 internal column. In shape the shell is similar to C. lirata 

 (Jim.) and C. mixta (Wr.)." 



It may be near U. albocrenata, but it is not variegated and 

 the suture is simple. 



Section Callonia Crosse & Fischer, 1870. 



Callonia C. & F., Journal de Conchyliologie for 1870, p. 18. 

 Type and sole species Cyl. elliotti Poey. PILSBRY & VANATTA 

 (in part), Proc. A. N. S. Phila. 1898, pp. 271, 276. 



Urocoptis with three axial lamella, the upper one largest 

 in the median whorls, the lower lamella denticulate or spi- 

 nose. Surface sculptured with large hollow ribs. Type U. 

 elliotti, pi. 48, figs. 1, 2, 3. (Kallone, elegance.) 



MM. Fischer and Crosse considered the dentition to be quite 

 divergent from that of other Urocoptis; but while somewhat 

 specialized by reduction of the number of teeth, it is not more 

 so than in many Cuban forms of Gongylostoma, and gives no 

 ground for ranking Callonia higher than numerous other 

 phyla in the genus. See pi. 60, fig. 9, U. dautzeribergiana. 



Callonia is like Liocallonia in the structure of the pillar, 

 the attenuated early whorls and smooth apex, but it is aber- 

 rant in the sculpture of hollow ribs, homoplastic with those 

 of Idiostemma, Holospira minima, etc., and representing the 

 acme of sculptural modification in this family. 



There are two species of Callonia: U. elliotti, in which the 

 last whorl is adnate or very shortly free, and not descending, 



