MANUAL OF CONCHOLOGY. 



Family UROCOPTID^E Pils. & Van. 



Cylindrellida TRYON, Amer. Journ. of Conch., iii, p. 311 

 (April, 1868), and of many subsequent authors. Eucalo- 

 diida (Eucalodium and Calocentrum) and Cylindrellida 

 (Anisospira, Holospira, Epirobia, Macroceramus, and Antilr 

 lean genera) , STREBEL & PFEFFER, Beitrag zur Kenntniss der 

 Fauna mexikanischer Land- und Siisswasser-Conehylien, 

 Theil iv, pp. 53, 74 (1880). Urocoptida, PILSBRY & VAN- 

 ATTA, Proc. A. N. S. Phila., 1898, p. 285. Pupida in part, 

 of FISCHER and some other authors. 



Shell cylindric, fusiform or turrite-conic, composed of 

 many narrow whorls (except in Pineria) , the early ones gen- 

 erally lost in the adult stage; last whorl adnate or free. 

 Aperture small, circular or squarish; the peristome more or 

 less expanded or reflexed, usually continuous, but interrupted 

 above in some genera. Axis hollow or solid, simple or vari- 

 ously sculptured. 



Foot very small and short, united by a long peduncle with 

 the visceral mass, and with the usual Holopod structure. 

 Jaw plaited, striate, ribbed or smooth. Radula as in normal 

 Holopoda or variously specialized. Lung long and narrow, 

 with a long pulmonary vein, but otherwise very weak venar 

 tion. Kidney narrow, wedge-shaped, about as long as the 

 pericardium. Genitalia of the haplogonous type, the sper- 

 matheca on a long duct, ovo-testis wholly imbedded in the 

 liver. 



Distribution, Antilles, southern Florida, northern coast of 

 South America, Central America and Mexico, and the adja- 

 cent southwestern United States. 



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