BULLA. 341 



Conch. Icon, xvi, f. 6. KEEP, West Coast Shells, p. 126, f. 117. 

 Not B. nebulosa Schroeter, 1804. 



This large species is much thinner than B. ampulla. It is larger 

 than any other American form, and has a characteristic pattern of 

 coloration and microscopic sculpture. 



B. ASPERSA A. Adams. PI. 37, figs. 25, 26, 27, 28. 



Shell oblong-ovate, narrowed anteriorly, solid, opaque, longitu- 

 dinally substriated, with numerous very fine stria?, painted with 

 white punctured spots; outer lip rather straight, its upper angle 

 produced ; inner lip thickened, white internally. (Ad.*). 



Payta, Peru, 6-8 fms. (Cuming). 



B. aspersa AD., Thes. p. 578, pi. 123, f. 78. SOWB., Conch. Icon., 

 f. 18. 



This species is evidently closely allied to B. punctulata, but the 

 exact relationship of the tw r o can be settled only by an examination 

 of the type specimen. Figs. 27, 28 represent a lower Californiau shell 

 referred to this species, but not without some doubt. It differs from 

 punctulata in having the interior of the apical umbilicus sculptured 

 with fewer (3-5) widely spaced spiral impressed stria?. 



B. PUNCTULATA A. Adams. PI. 37, fig. 39 ; pi. 36, figs. 29, 30. 



Shell oval, solid ; indistinctly clouded with flesh-color on a lighter 

 ground, and usually obscurely blotched with dark, forming two ill- 

 defined girdles ; the whole showing few or many dark dots shaded on 

 the left y white-edged on the right side. Surface smooth, showing 

 under a strong lens an excessively dose and fine wavy spiral striation. 

 Vertex umbilicated, the interior of the umbilicus sculptured with deep 

 spiral grooves, about a dozen in number. Aperture lined with 

 whitish, scarcely showing the external markings. Columella bear- 

 ing a heavy lunate callus which is often brown-edged ; parietal 

 callus thick and heavy. 



Alt. 25, diam. 16 mill. 



Panama (Cuming) ; Mazatlan ; Cape St. Lucas. 



Sulla pundata A. AD., Thes. Conch, ii, p. 577, pi. 123, f. 77. Not 

 of Schroeter. B. punctulata A. AD., t. c., p. 604. SOWERBY, Conch. 

 Icon. f. 8. Bulla adamsi Mke., CPR., Maz. Catal., p. 172 (and per- 

 haps B. adamsi Mke., Zeitschr. f. Mai. 1850, p. 162, excl. synonymy). 

 ? B. quoyi A. AD., Thes., p. 576, pi. 123, f. 71, and SOWB., Conch. 

 Icon. f. 19. 

 23 



