16 Lower Californian Shells. | ZOE 
10. B. suFFLATUS Gould, 1853. La Paz, lat. 24° 10°, May. 
Rich, Gabb. San José del Cabo, Bryant. The large, east coast 
form of B. pilula.(?) Not found by Xantus, nor on west coast. Bry- 
ant also found a few pale brown ones, besides the usual white; both 
colors in living shells. 
11. B. xanrust W. G. B., 1861.“ Promontory of Cape St. 
Lucas,” four specimens, Xanius. The three species reported from 
the Cape, but not since detected, and two others which Xantus 
stated to extend so far up the west coast, but not confirmed,, were 
perhaps considered by him as varieties of one or more of the other 
species. The possibility that he obtained some from Socorro Is- 
land, or from the Mexican coast, where he also collected, is to be 
considered. © 
12. CYLINDRELLA IRREGULARE Gabb, 1867. Central range of 
mountains near east coast, around Mulejé, lat. 26° 50, Gadd. 
13. C. TAYLORI Pfeiffer, 1861. (C. newcombiana) Gabb, 1867. 
Same locality as the last, Gadé. Original locality of Pfeiffer’s type 
unknown. 
14. HELIX AREOLATA “Sowerby MS.”’ (Pfeiffer, 1845). 
California Hinds, ‘‘ near Columbia River” (Pfeiffer). This confu- 
sion can only be explained by mixing of labels, as Pfeiffer seems 
to have received these shells from the British Museum for deseri p- 
tion, with the MS. names. ‘“Margarita Bay, lat. 24° 20’. The 
only land shell received from the bay,’’ (Pease). Cedros Island, lat. 
24° 02’, Veatch, a very large form described as 4. veatchiz, New- 
comb. These, with A. /evzs and pandore, form a closely allied 
group. 
In 1867 Mr. W. M. Gabb made a geological exploration of the 
peninsula for a land company, under J. Ross Browne, traveling the 
whole length and crossing it ten times. In his report to Mr. 
Browne, dated San Francisco, 1869 (published in J. R. Browne's | 
Report on Mining Regions), he mentions finding immense numbers 
of this species, sometimes whitening the ground with bleached 
shells, and extending from Salada, lat. 24° 15’, to San Tomas, lat. 
31° 35°, on west coast. He mentions none of the allied forms, and 
thus appears to consider them varieties. (See notes on them). Dr. 
_ Veatch in same report states that the var. veatchit was the only land 
shell he found on Cedros Island, and on the peninsula east of it. 
Pa 
