"""iss^^''] PROCEEDINGH OF TRY. NATIONAL MUSEUM. 751 



Helix (Arionta) Dupetithouarsii DesLayes. 



Two exainples, dead. 



Monterey, Cal., witli the foregoing, on tlie same day; Vernon Bailey. 

 This species is rather hjcal in its occurrence; the Santa Cruz form, 

 somewhat differentuited in color and epidermis, though modified envi- 

 ronmental conditions, has received the name of sequoicola. 



Helix (Aiionta) Rowelli Newcomb. 

 ^=H. Lohri Gahb. 



Three specimens, dead. 



Fort Huachuca, Ariz.; Dr. A. K. Fisher, May 14, 1892. 



Dr. Fisher's examples agree perfectly with the specimens in the 

 National Collection, collected by the late Prof. Gabb, who found them, 

 as elsewhere stated by me, in the table-lands of Lower California, near 

 Mulege. It has been reported from the Salt Eiver Mountains, 7 miles 

 north of Phtenix, Ariz., by Pilsbry, and has been credited to Chihuahua, 

 Mexico, and still further to the eastward in the State of Texas. 



It is interesting to note its occurrence at Fort Huachuca, associated 

 with Fatula HcmphlUl and TriodopsiH Levettei. 



Binney, on page 22 of the Manual of American Land Shells, in speak- 

 ing of H. Rowelli, says it "has been referred to Arizona, but errone- 

 ously," and, in connection with E. Kemondi (Carpenteri)^ says "it is 

 the only species common to the peninsula and mainland of Mexico;" 

 these statements, in the light of later knowledge, require correction. 

 It is highly probable that other forms now regarded as peculiar to the 

 peninsula of Lower California, will sooner or later be detected on the 

 mainland. 



Family liULIMULIDvE. 

 Genus BULIMULUS Leach. 



Bulimulus dealbatus Say. 



Four dead shells. 



Stone County, Mo., lu^ar Marble Cave, "on the side hills;" Vernon, 

 Bailey. 



The upper wlnnls of the adults exhibit tlie hmgitndiiial ribbing char- 

 acteristic of B. Rai/s(h(lei Pilsbry. This species has heretofore been 

 reported from various places in Texas by Mr. Bailey and others con- 

 nected with the Biological Division of the Department of Agriculture. 



William Lloyd collected several exani])les of this species at Monterey, 

 Mexico, in 1891. 



Family srCCLMID.E. 

 Geuus SUCCINEA l>rai»ariiaud. 

 Succinea Salleana Pfeiffer. 

 Six examples, dead. 



Houma, La.. A^ernon Bailey, May 8, 1892. 

 This is a well-marked species and quite distinct from the following: 



