332 BULLA. 



faint grooves above, but this is exceptional. The umbilicus rarely 

 lacks internal line, but they are generally weak. 



Alt. 11, diam. 6 mill, (typical occidentalis, Bahamas). 



Alt. 34, diam. 19 mill. (Vera Cruz specimen). 



Alt. 21, diam. 12 mill. (Jamaica specimen of ordinary size). 



Entire West Indies ; Mainland from Trinidad to Vera Cruz, Cor- 

 pus Christi, etc., Florida; Bahamas. 



B. occidentalis A. ADAMS, in Sowb., Thes. ii, p. 577, pi. 123, f. 

 72, 73 (1850). SOWB., Conch. Icon., f. 14. BALL, Blake Eep., p. 

 55Bulla alba TURTON, Zool. Journ. ii, p. 364, pi. 13, f. 6 (worn 

 and bleached specimens, teste Dall, from Turton's types). ? B.per- 

 atriata MKE., Zeitschr. f. Mai. 1853, p. 138.? B. nux MKE., t. c., p. 

 140. B. striata BRUG. (part of synonymy) and of many authors. 



This is the most abundant and universally diffused of the West 

 Indian Bullas. In examining hundreds of examples, covering the 

 entire region, we are unable to separate the small form originally 

 named occidentalis, from the larger shells known to collectors as " B. 

 striata." Every connecting link occurs. Many of the main patterns 

 of coloring are illustrated on my plate, but there are others ; and some 

 have a delicacy quite beyond any published figures. 



Bulla (Bullea} tenuicula Mke., (Zeitschr. f. Mai. 1853, p. 139, and 

 Malak. Bl. i, p. 45, from Puerto Cabello), is probably a form of this 

 species. 



B. STRIATA Bruguiere. PL 37, figs. 42, 43, 44, 45, 46. 



Shell moderately solid, oblong-subcylindncal or oblong ovate, 

 tapering toward the ends; whitish, mottled and clouded all over 

 with purplish and usually showing an indistinct girdle of heavier, 

 darker blotches above the middle ; surface smooth, usually showing 

 under a lens an excessively fine, close spiral striation, and having 

 deeper spaced grooves toward the base and a few near the vertex. 

 Toward the top the body-whorl is rather compressed, the vertex 

 being a very narrowly rounded, compressed margin around the wide 

 open and deep apical umbilicus, which is closely spirally grooved 

 within (fig. 46). Aperture narrow above, wider below ; columella 

 with a brown-stained, lunate, reflexed callus; parietal callus thin. 



Alt. 24, diam. 13 mill. 



Mediterranean Sea; Atlantic coasts of Portugal and Morocco; 

 Pliocene of Florida (Dall), and living at Clearwater Harbor, W. 

 Florida (Johnson). 



