HAMINEA. 355 



Bnlla orbignyana FERUSSAC, Diet, classique d'Hist. Nat., ii, p. 

 -573, Dec., 1822. FISCHER, Journ. de Conch., 1879, p. 21. B. 

 dilatata LEACH, Syn. Moll. G. B., p. 42, 1852. 



West Atlantic and Antillean species. 



Analysis of forms. 



a. Vertex perforated, the lip arising on left side of perforation, 

 and angled near its insertion. 



b. Large, with close, conspicuous engraved spirals all over, 



elegans. 



bb. Small, surface polished, with fewer spirals, glabra. 

 ni. Lip arising on right side of the center of the vertex, not 

 angled. 



b. Grooved throughout with distinct, spaced spirals, solita- 



ria, succinea. 

 bb. Spiral strife obsolete or excessively fine. 



c. Shell subcyliudrical, oolumella gently concave, 



petitii. 



cc. Shell globose-ovate, columella very concave, antil- 

 larum. 



H. ELEGANS Gray. PL 41, figs. 37, 38, 39 ; pi. 40 fig. 88. 



Shell roundly oval or someivhat cylindrical, truncated above, rounded 

 below. Color pale brownish-yellow or pale greenish, fading to 

 white at vertex and base. Surface with irregular growth wrinkles, 

 sometimes rather coarsely plicated; and showing plainly to the 

 naked eye, close, fine spiral striation. Under the lens the sculpture 

 is seen to be formed of clear-cut incised straight spirals, as if 

 machine engraved, the entire surface being scored with minute, 

 mingled with much coarser unequally spaced grooves. Vertex con- 

 cave and minutely perforated, the outer lip arising from the left 

 side of the perforation^ which is encircled by a crescentic projection 

 from the parietal callus, at the upper termination of which there is a 

 salient angle of the arising lip. Outer lip equably arched, well 

 rounded above and below. Columella deeply arcuate, thin, with 

 very narrow white reflexed and appressed edge, and a small fold 

 above; parietal callus unusually thin. 



Alt. 19, diam. 13 mill. 



Alt. 20-1, diam. 16 mill. 



West coast of Florida and Texas; West Indies; St. Thomas, Cur" 

 acoa, etc. ; Rio Janeiro. 



