214 AMERICAN JOURNAL 



months of the year, but covered by low shrubbery and herbage, 

 with a few Cactaceae and other succulent plants. On its west 

 slope myriads of the shells of Kellettii occur, but very few living. 

 These appear to be dying out, as they all have that bleached 

 appearance (even when living), seen also in other species ex- 

 posed to the sea winds and fogs, the bands and mottlings being 

 very faint or obsolete. 



It is said that when the Spaniards first visited this port the 

 point was an island; and it may then have been more favorable 

 to the existence of these shells. 



The original figure of Kellettii, as Mr. Gabb remarks, differs 

 considerably from his specimens, and also from those found 

 within this State usually referred to it, though none of them 

 vary more than forms of many others of our species. Kel- 

 lett's specimens were probably from one of the small islands 

 off the coast of the Peninsula, though credited to " Central 

 America," and were a dwarfed form, the species attaining its 

 highest development on Catalina Island, within this State (not 

 Santa Barbara Island, as stated by Newcomb, where Tryonii 

 replaces it.) They are not very numerous on Catalina Island, 

 however. An account of that locality will be given hereafter. 



Those from San Diego seem to connect this large form with 

 the smaller Steamsiana and the still smaller type. Mr. Gabb 

 tells me that the San Diego form extends some distance down 

 the peninsula. 



Prof. A. Wood found specimens on the summit of a mountain 

 "twelve miles east of San Diego, and at one or two thousand 

 feet elevation," which, although much smaller, were finely 

 colored, more like the original type, or like Mr. Gabb's 

 Steamsiana. 



H. Remondii? (Tryon.) A specimen found in this vicinity was 

 referred, by Dr. Newcomb and myself, to his rufocincta, though 

 differing considerably from the types found on Catalina Island 

 and approaching Trashii. It now appears to be identical with the 

 form found by Mr. Gabb on the peninsula, and called by him 

 Remondii (Tryon). These all differ, however, from Mr. Remond's 

 Guaymas specimen, in having one or two more whorls, as well 

 as larger size, though they may yet be identical. 



About seven miles north of San Diego is the first point where 

 I have found tudieulata, Binney. It occurs scattered among 

 rocky and shrubby canons, away from the sea air, and increases 

 in numbers in going inland until we reach the elevation of at 

 least 4,000 feet in the main range forming the continuation of 

 the Sierra Nevada, east of which none occur. Those found 



