10 



H. NuTTALLiANA, Lca, is nniversally considered as H. fidelis, Gray. Mr. Gray's 

 iiescriptioa has the priority of several years. 



H. Vancouverensis, Lea, I see no reason why H. vellicata, Forbes, should 

 not be considered as a variety of this. 



H. EGI5NA, Gould non Say, pi. xxii. a. This shell, though never seen by Mr. 

 Say, is called by one of his names. It is certainly a disadvantage to increase 

 the already buithensome nomenclature, but is it not worse to make one name 

 serve for two distinct species ? Mr. Say's shell was found by Mr. J. S. Phillips 

 at the 8 mile lane above Philadelphia, and is still preserved in his collection. 

 I think it will prove to be distinct from chersina, Say. The latter has a much 

 more elevated spire, rounded at the top like labyrinthica, Say, and is only obtusely 

 carinated ; while in egena, Say, a very acute carina divides the shell into a short, 

 pyramidal, sharp spire, and a rounded, inflated base, whose outline forms a 

 semicircle. As I consider H. egena a good species, I leave it to Dr. Gould to 

 propose another name for the Florida shell. 



Helix fallax. Say, is certainly more than a variety of tridentata, Say. Not 

 only are the characteristic diflferences well marked, but the habits of the re- 

 spective animals are different. Mr. J. G. Anthony tells me that tridentata is found 

 on hill sides in the grass, YihWe fallax inhabits rich soils, in woods, under logs, 

 and is not gregarious like the former. The difficulty is to mark the dividing 

 line between the many varieties of fallax, some of which are quite as distinct as 

 H. Hopetonensis, Shuttl. In one specimen of fallax in va^ cabinet there is a 

 well developed "fulcrum" as in monodon, spinosa, and others mentioned by 

 Mr. Lea. 



Helix minutissima, Lea, is certainly distinct from H. minuscula, Binney. Had 

 my father been spared to finish his work, he would have withdrawn the opinion 

 expressed in Vol. ii., p. 221. I have a note of his taken at Mr. Lea's house, in 

 which he says they are distinct. Dr. Leidy tells me that he made a figure of 

 Lea's type for engraving, which was subsequently lost. 



Helix costata, Miill. Dr. F. V. Hayden collected many thousands of this 

 ribbed variety of pulcliella, Miill. (minuta, Say,) in Nebraska. It had hitherto 

 been noticed only in Philadelphia and Cincinnati. 



Helix glaphyra, Say, pi. xxix., f. 4. That this shell is identical with cellaria, 

 Miill., was the opinion of Dr. Binney. I am able to add to the same efi"ect the 

 testimony of two of our first conchologists, Mr. J. G. Anthony and Dr. Griffith. 

 The former tells me that thirty years ago he found a shell in considerable num- 

 bers in his garden, at Providence, R. I., in all respects agreeing with the Euro- 

 pean cellaria. On carrying it to Philadelphia, the conchologists of that time 

 all called it r/lapln/ia, Say. The testimony of Dr. Griffith is still more conclusive. 

 I have a letter of his to my father in which he says that he had seen Say's type 

 of glaphyra in the collection of the Academy, and that it was certainly the 

 cellaria of Europe. He adds, that when arranging the collection, the shell was 

 broken and thrown aside. 



Helix saxicola, Binney non Pf. pi. xxix.a. f. 4, is H, incrustata, Poey. It 

 agrees in all respects with the Cuban specimens in the Academy received from 

 Mr. Poey. 



Helix lucubrata, Binney non Say, pi. xxxii. does not represent Say's shell. 

 Though figured by Deshayes in Fer. Hist. pi. Ixxxii. f. 6, it was first described by 

 Pfeiffer, Mong. i, p. 64. The common form is hardly as globose as the she! 

 figured. 



Helix sulplaka, Binney, has been found by Mr. J. S. Phillips on the banks 

 of the Susquehanna, near Wyoming, Pa. 



Helix intertexta, Binney, pi. xxxvi. The southern form of this shell would 

 by many be hardly considered as the same species. The spire is very much 



[October, 



