218 AMERICAN JOURNAL 



110 miles north-west of it. It is 70 miles from San Diego and 

 48 from San Pedro, the nearest part of the main land, Catalina 

 Island, being half way between the two. Although entirely 

 basaltic, the surface soil contains enough lime, from the decom- 

 position of animal remains, to support an abundance of H. cre- 

 bristriata near its northern extremity, where they live among 

 arborescent Neaboses, Cactacese and other succulent plants. 

 During my visit, early in July, they were torpidly sestivating, 

 the mouth of the shell closed by a membrane. They seem like 

 a local var. of Kellettii, and are quite variable. I also found a 

 few specimens of that rather doubtful species, H. Gabbi, Newc, 

 which seems like a dwarfed variety of rufocineta, but was the 

 only other form I found on the island. 



Catalina Island (the " San" is omitted in speaking of the 

 islands), is composed of metamorphic and volcanic rocks, sand- 

 stone and probably limestone, but no fossils have been found 

 there. It rises 2,000 or 3,000 feet and is rugged, with a small 

 marshy tract and many springs scattered over it. Near the 

 northern end I found H. rufocineta, Newc, sestivating in June 

 under flat stones, and saw none except at that point, a small 

 valley facing the north. With them were a few very large and 

 fiue JT. Kelletii, which seems more diffused over the island, being 

 found smaller and more numerous at the " Isthmus," a neck of 

 land connecting the two parts of the island, also more rarely in 

 damp, shady spots elsewhere. Being sheltered from the sea 

 breeze, these specimens are finely colored. Not found on Santa 

 Barbara Island, aststated by Newcomb. 



At the "Isthmus" were also found a few semi-fossil specimens 

 of apparently a small race of rufocineta, forming the connecting 

 link between it and Gabbi, of which a few also occurred near the 

 southern end of the island. 



Since my visit, Mr. Voy has found, at a springy locality on 

 the mountain slope south of the isthmus, a large number of 

 specimens connecting H. Gabbi with H. facta, Newc. Indeed, 

 Dr. Newcomb was inclined to consider them Gabbi, and one is 

 figured as that species by Tryon, in Amer. Jour. Conch., ii. 4, 

 pi. 6, f. 19, (Monog. Terr. Moll.,) while the true type is figured 

 in pi. 11, f. 81, (iii. 2, 1867). Mr. Voy also found Patula Durantii 

 somewhere on the island, probably among rocky ledges, which it 

 inhabits elsewhere. 



The range of H. Kellettii (if we include Stearnsiana as a var.) 

 thus extends from latitude 33° 30' to near latitude 30°, a dis- 

 tance of nearly 250 miles, and perhaps further. The range of 

 others will be given hereafter. 



