220 AMERICAN JOURNAL 



flat, formed of sandstone of very recent elevation above the sea, 

 and destitute of water in the dry season, except what is obtained 

 from brackish wells near the sea level. Fossils are quite plenty 

 at several elevations or terraces, and on these are found speci- 

 mens of H. Tryoni and H. facta, scarcely distinguishable from 

 those of Barbara Island, but much less numerous. They seem 

 to have become colonized from that island at a comparatively 

 recent period. I also found a very peculiar, nearly flat species, 

 like a Polygyra, with a thick, annular peristome, but no teeth. 

 All found were sub-fossil, and though sent to Mr. Binney, he 

 has not yet described it. 



These island species, together with Kellettii, inhabit the nearly 

 treeless regions of California, and are nearly all palest beneath. 



Returning now to the main land, H. Traskii, Newc, was dis- 

 covered in the mountains near Los Angeles, probably the Sierra 

 Nevada north-west of that town, as I have been unable to find it 

 anywhere in other directions after extensive search. From thence, 

 lat. 34°, it extends north to Fort Tejon, fifty miles, occurring 

 there only at or above 4,000 feet elevation, Dr. Horn finding it 

 common near the summit of the Pass. Toward the north-west, 

 it extends to the hot springs near San Luis Obispo, 150 miles, 

 and probably further, being thus confined chiefly to the coast 

 ranges. It is a distinct species from H. Dupetithouarsi, its next 

 neighbor northward, and more nearly allied to rufocineta and 

 Ayresiana, from the islands. I have not heard of any other 

 species from this region, nor found any at Santa Barbara or 

 elsewhere in it, though Traskii is found near San Buenaventura. 



Santa Cruz Island lies 25 miles directly south of Santa 

 Barbara, and directly on the parallel of 34°. I visited its 

 northern shore once only for a short time, and found it to be 

 metamorphic, much like Catalina Island. I found no Helices, 

 and Dr. Newcomb, in a more thorough research lately, succeeded 

 in finding only H. Ayresiana (before incorrectly credited to 

 " Vancouver's Island "), and no living specimens of that. Others, 

 however, probably exist high on the summits, where there are 

 some large trees, and in springy places. Santa Rosa and San 

 Miguel Islands are directly west of Santa Cruz Island, but have 

 not been recently visited by collectors. Dr. Newcomb, however, 

 received dead worn specimens from the latter, which look like 

 W. G. Binney's intercisa, also credited to "Oregon," but evi- 

 dently of this island group, and allied to crebristriata. The 

 type of Ayresiana probably came from there also. 



Between the known range northward of H. Traskii and that 

 of Dupetithouarsi, is an interval of 110 miles, which has not 



