376 CALIFORNIA ACADEMY OF SCIENCES. 



Corrections of Article " On Fossil and Sub-Fossil Land Shells in 

 the United States," in Bull. 4. 



Page 236 — From the fall list of Bland's works, published 

 lately by Mr. A. F. Gray, C. E. (Salem, Mass., 1884), it 

 appears that most of his papers on West Indian shells, and 

 those quoted in Binney's Bibliography, are dated before 

 1858, but those on North American species, between 1858 

 and 1883. 



Page 246 — Later information from Mr. Thomson, and 

 also from Mr. Moores (p. 248), will be given hereafter under 

 the head of introduced species. 



Page 247 — "3Iacrocyclis." The type of this genus being 

 now known to belong to a different family, I have in the 

 table, page 367 of this article, substituted Mesompliixj of 

 Kafinesque, of which the type was "il/. planorhoides,'' so ad- 

 mitted byFerussac and Pfeiffer in many publications. The 

 fact that the species was previously named concava by Say 

 does not invalidate the generic name, nor does its use as a 

 sub-genus of Zonites by W. G. Binney, affect its previously 

 established position. Mr. Ancey has made for the same 

 genus the name Selenites, a word already used in mineralogy, 

 and not at all needed here. The genus as named by Rafin- 

 esque is as well established as his Mesodon, now generally 

 adopted on quite as slender foundations. 



Page 252 — The lowest paragraph was accidentally mis- 

 placed, as it should have preceded Liniax, etc. Very full 

 information on species near lat. 49^, mostly furnished by 

 Eev. G. W. Taylor, will appear later. 



Page 255 — Mr. Binney's exact words are, "It has simple 

 genitalia without the accessory organs usually found in 

 Arionta.'' He has, however, since described the plainer 

 Eastern forms from Montana, etc., as ^'3Iesodon ijtycliopliora^ 

 Avith varieties major and minor. 



