I/cIi.r (/.ytrrKfi in ('(illfunn'a. 139 



San Miguel, and Santa Rosa, where it has since b^en found, by 

 Plarfoi'd, Hemphill, and others. It is nearly related to H. Du- 

 pefithouarsii, which occupies a maritime, but less exposed wooded 

 station on the main land, much farther to the north, near 

 Monterey, bay, in Monterey County ; south of said county is a 

 long stieteh, a large area extfending southerly to Point Concep- 

 tion at the head of the Santa Barbara channel, which embraces 

 the counties of San Luis Obispo and Santa Barbara, Avhere H. 

 T'raskii, another closely related form, occurs ; south of the point 

 is the small island of San Miguel and the larger ones of Santa 

 Cruz and Santa Eosa, where Ayresiana is found. H. Ayresiana 

 is much lighter colored than the average of DupeiWiotiarsii ; 

 it inhabits a more arid and treeless station ; its general tone 

 may be described as a dingy light cafe-au-lait , with a rather 

 broad reddish-brown band, which in some individuals is obscure 

 or entirely obsolete. H. TrasJcii sometimes exhibits the sculp- 

 ture herein noticed. Sjiecimens of H. intercisa from San 

 Clementejsland are sometimes beautifully sculptured. 



Of the Sun Clemente snails, for which I am indebted to the 

 courtesy and generosity of Mr. Hemphill, H. intercisa, — with 

 which Mr. Binney includes H. crebristriata, Newcomb, as a 

 synonym, — is closely related to H. Tryom,'^ and the H. redimita 

 specimens, received from the same gentleman, indicate an equally 

 close connection with H. Kellettii, which has the same number 

 of whorls, and other characters in common. 



It will be observed, upon a comparison of the shells herein 

 recited, and the stations wherein they are found, that the geo- 

 gra]3hical proximity or relationship also corroborates the views 

 herein expressed. 



Further testimon}^, showing the propriety of my remarks as to 

 subgeneric divisions, is presented by reviewing the relationship 

 of these San Clemente snails, and comparing the same with the 

 positions heretofore assigned to them. 



February, 1881. 



* I find Mr. Binney practically agrees with the above, upon turning to 

 Bull. Mus. Comp. Zool., Vol. V, p. 357, which see. 



