AMERICAN OPEAS. 195 



are much elongated 9.6 x 2.7 mm., with about 8y 2 whorls, and 

 rather irregular sculpture. This is B. contract a of Poey. If 

 it be thought varietally separable from micra, part of the 

 Yucatan shells would be referred to the same race. 



In Haiti, 0. micra was taken by Messrs. Henderson and 

 Simpson at Cape Hatien, Charmette three miles southward, 

 and at Sans Souei, and by H. Prime at Santo Domingo City. 

 It is a rather diminutive race, usually not well sculptured, 

 the largest measuring 7 x 2.1 mm., with 7 whorls, but most 

 individuals are smaller. 



Jamaican specimens vary like those of Cuba in form and 

 sculpture, but do not reach quite so large a size. A common 

 form is illustrated, pi. 27, fig. 56, (Kingston), but others in 

 the same lot are larger and less ribbed. The J. B. Henderson 

 collection contains specimens from near Port Antonio, Black- 

 stone River, Bluefield, Bogwalk, Bowden, Hope River, Mona 

 House, Montego Bay, Ocho Rios, Mt. Pleasant, and Rockport, 

 near Kingston. 



Bulimus octonoides C. B. Ad., of which I have examined 

 Adams' type series, is absolutely equivalent to 0. micra. 



In the lesser Antilles, only very small specimens are be- 

 fore me from St. Thomas and St. Eustatius. In the other 

 islands the shells are not distinguishable from the ordinary 

 Jamaican form. 



In the United States, 0. micra is known to me from Miami 

 in southeastern Florida, where I have found it abundant. 

 Half -grown and adult specimens are figured (pi. 28, figs. 

 60, 61). 



Achatina lucida Poey was based upon a single young speci- 

 men of micra. The original description follows : shell ovate- 

 oblong, vitreous, whitish, elegantly sculptured with regular 

 transverse riblets; apex obtuse; whorls 6, convex, the suture 

 profound. Aperture small, margin acute ; columella straight, 

 narrowly folded back, covering the umbilicus completely. 

 Length 3 mm. Near the Canimar river, on the east side of 

 Matanzus Bay, coll. Dr. Gundlach. Poey's figure is copied on 

 my pi. 28, fig. 64. 



Pfeiffer subsequently identified specimens from Havana as 



