BU LIMITS. 131 



tion of what appears to me the type of Bui. dealbatus. 

 The species varies considerably, but never sufficiently to 

 authorize the quotation of alternatus, Binneyanus, Schiede- 

 anus, and patriarcha as synonyms. 



It is found in large quantities in Texas, Alabama, North 

 Carolina, Missouri, and Arkansas. Future researches will 

 probably prove it an inhabitant of the neighboring South- 

 western States. It also occurs fossil in the Postpleiocene. 



Say's description is as follows : 



H. DEALBA.TA. Shell conical, oblong, thin and fragile, some- 

 what ventricose ; volution 6-7, wrinkled across, wrinkles more 

 profound and acute on the spire ; spire elevated, longer than the 

 aperture, sub-acute ; aperture longer than wide, labrum not reflect- 

 ed ; umbilicus small and profound. 



Length more than three-fourths of an inch, breadth nine-twen- 

 tieths of an inch. In the Cabinet of the Academy and Philadel- 

 phia Museum. Inhabits Missouri and Alabama. 



In outline it resembles a Bulimus. Four specimens of this 

 species were sent to the Academy from Alabama, by Mr. Samuel 

 Hazard; and a single depauperated specimen was found by myself 

 on the banks of the Missouri. 



Bulimus physoides Reeve (No. 507) corresponds exactly 

 to a variety of dealbatus sent from Alabama by Dr. Show- 

 alter. It is quoted by PfeifFer (iii. 418) as a synonym of 

 B. melo Quoy. 



Pfeiffer quotes B. Liquabilis Reeve as a variety of B. 

 confinis Reeve. I am inclined to consider them both as 

 varieties of dealbatus but subjoin Reeve's descriptions, 

 having copied his figures respectively on pi. 88, figs. 6 

 and 7. 



BULIMUS CONFINIS. Bui testa ovata, subventricosti, profunde umbil- 

 icata, anfr. 6, rotundatis, tenue striatis, columella late dilatata, subreflexa, 

 apertura orbiculari, labro simplici ; pellucidocornea, opafo-albido varie- 

 gata. Hab. Texas. 



BULIMUS LIQUABILIS. Bui. testa ovato-coniea, ventricosa, umbili- 



