Shell ovoid-cylindrical, rather solid, bluish white, covered by a 

 rough straw colored epidermis : whorls five, the anterior one elon- 

 gated, somewhat fusiform, rounded anteriorly, sculptured with fine, 

 close-set revolving striae, more distinctly indicated when the epider- 

 mis is present ; the four posterior whorls form a conical spire, hav- 

 ing a suture so profound that they seem invaginated and quite 

 detached from each other. Aperture linear, widening anteriorly, 

 and in front somewhat trigonal. Inner lip formed by a sharp, very 

 prominent, abruptly twisted white fold, with a submarginal excava- 

 tion, terminating acutely in front, in such a manner as almost to 

 form a canal. 



Found by Col. Jewett at Santa Barbara. 



Length one inch ; breadth one fourth of an inch. 



There is no species described approaching to this, except B. 

 tennis^ Adams, which differs widely in its proportions. The re- 

 markable columellar fold would almost bring it within the genus 

 Tornatella, but its general characters decide in favor of Bulla. It 

 may most properly be placed in the subgenus Akera, though some 

 of its abnormal characters bring it in close alliance with Tornatina. 



BULLA (TORNATINA) CEREALIS (PL XIV. Tig. 9.) 



T. parva, ovoideo-fusiformis, solidula, eburnea, levigata ; spira exserta, tabu- 

 lata, mamillata ; anfr. quatuor ; apertura angusta, antrorsum dilatata, labro ad 

 medium saliente, postice sensim approximante, et ante suturam coadunato ; co- 

 lumella callosa, plied valida instructa. 



Shell minute, solid, ovoid fusiform, ivory while and polished ; 

 spire prominent, composed of three or four whorls rising by regular 

 grades, and mamillate at tip ; aperture linear above, gradually wid- 

 ening forwards ; the outer lip, salient at the middle, and very gradu- 

 ally approaching the body of the whorl posteriorly, unites to it 

 before reaching the suture ; columellar margin callous its whole 

 length, with a strong fold at base. 



Length one fifth of an inch ; breadth one twelfth of an inch. 



Found at Santa Barbara by Col. Jewett. 



In form and size this shell is scarcely to be distinguished from 

 B. graciliS) A. Adams, which, however, is described as horn co- 

 lored, and covered with revolving striae ; whereas this is ivory white, 

 and exhibits no strise whatever when much magnified. In terms it 



