52 CALIFORNIA ACADEMY OF SCIENCES IP roc. 4th Ser. 



For purposes of comparison figures of the shell and micro- 

 scopic sculpturing of the type specimen of pctricola are here 

 appended (Plate 4, figs. 4a-4c; plate 5), especially as this 

 species has recently been strangely misunderstood by Bartsch 

 (: 16, p. 612), who referred it without qualification to E. traskii 

 troskii (Newcomb). As a matter of fact very few of the 

 numerous races described by him in the same paper have nearly 

 the claim to separate recognition that petricola has, although I 

 believe with him that most of them will stand. E. petricola is 

 in fact the earliest described prototype of a whole series of 

 southern Californian mountain snails, the exact relation of 

 which to true traskii still remains to be determined. E. ::cchco 

 Pilsbry ( :16), on the other hand, seems quite close to petricola. 



Both petricola and orotes are distinctly papillose over much 

 of the upper surface. A very young petricola now at hand from 

 the type locality (Cat. No. 3950, Berry Collection) shows that, 

 when perfect, each papilla bears a minute, stubby, hair-like 

 periostracal process. 



Epiphragmophora petricola sangabrielis, new subspecies 



(Plate 4, figs. 6a-6c) 



Diagnosis: Shell low-conic, thin, fragile, rather tumid, um- 

 bilicate; the umbilicus rather narrow, barely permeable to the 

 apex, and with a diameter about one-twelfth the greater diam- 

 eter of the shell. Whorls 5>4, convex, the last swollen and 

 slightly descending in front. Aperture rounded, sometimes 

 slightly flaring, oblique (40°). Edges of peristome slightly 

 converging and connected by a very thin, transparent parietal 

 callus. Lip only slightly thickened ; everted near the pillar so 

 as to indent the circular outline of the umbilicus. 



Periostracum somewhat glossy, often with a strong satiny 

 sheen or semi-iridescence. Lines of growth numerous and 

 fairly strong, though somewhat irregular. First half whorl 

 when unworn showing rather strong, more or less interrupted, 

 incremental wrinkles, and traces of a strong, coarse, overlying 

 papillation; succeeding turns very finely wrinkly-granulose be- 

 neath the retractively slanting lines of small and at first often 

 nearly obsolete papillae, the latter increasing in strength to the 



