WEST COAST PULMONATA. 361 



Pass, now more like the form first described as H. trasJd. 

 Tliis form was from Los Angeles, or the mountains near 

 there, about 60 miles farther southeast, but is abundant in 

 many spots along the whole coast slope in that direction, 

 with much variation in size and convexity but uniform in 

 color. Being often found throughout this range in com- 

 pany with No. 6 (but never with connecting forms), as far 

 south as San Diego, it shows that the region has been colo- 

 nized from the Sierra Nevada with these animals, although 

 the geological structure indicates the period of elevation to 

 have been of very late tertiary or post-pliocene date near 

 the coast. On Santa Rosa Island it seems to have changed 

 to H. ayersiana, a rare connecting link having been found 

 near Santa Barbara by Dr. Yates, but on other islands of 

 the group it is represented by the nearer allied^, rufocbida, 

 and may perhaps have been the original stock from which 

 the very much dwarfed var. gahbi and H. facta were de- 

 rived. On Coronados Island, Lower California, it is how- 

 ever like var. carpeiiteri, and on Guadalupe Island Mr. 

 W. E. Bryant found a form more like that of Lower Cali- 

 fornia peninsula, once confounded with H. remondi. Mr. G. 

 W. Dunn informs me that H. facta is also found on Guada- 

 lupe Island, and the very peculiar Helicoid, Binneya noia- 

 bilis, has been found there by Mr. Bryant, as well as on the 

 peninsula by Mr. Orcutt. The latter also reports Pupaovata 

 from near San Diego, and P. arizonensls from under Yucca 

 logs on the east slope of the mountains, which are thus con- 

 nected with the Arizona fauna, as I stated in the Amer. Jour. 

 Conch. IV, 217, 1869, though there was some doubt then of its 

 occurring in California. No other new facts on distribution 

 toward the southward have come to my notice. 



2. THE COAST RANGES SOUTH OF MONTEREY. 



It is to be observed that while the Sierra Nevada are to a 

 great extent cut off from the direct force of the sea breeze 

 except near the middle, their higher parts are so much above 



