134 



A MANUAL OF AMERICAN LAND SHELLS. 



Fig. 100. 



types of ramentosa to Dr. Gould, and of reticulata to Dr. Pfeiffer, from 

 Mission Peak, twenty-five miles southeast of Oakland. 

 Dr. Newcomb's description of H. Bridgesi is as follows : 

 " Shell deeply umbilicate, depressly globose, plicately striate and 

 covered with minute granulations, translucent 

 grayish horn-color; within tinted with i^urple, with 

 a narrow, incircling central brownish band ; si)ire 

 conical ; whorls G, convex ; suture well impressed ; 

 aperture roundly lunar; lip expanded and re- 

 flected, of a pale lilac-color. Greater diameter, 27'"'"; 

 height, 19""". Aperture : Diameter, 13'"'" ; height, 



11 mm 



" Bcmarls. — But a solitary specimen of this shell 

 has been obtained, but it differs essentially from 

 any described species. In its lightness of structure 

 2/. i?n"(V.s), lUpiessed. ^ud general aspect it resembles Helix Bonplandi^ 

 from which it is widely separated in most of the detail of character. 

 Its nearest approach to any described California species is to H. 

 ramentosa, Gould, which is much smaller in size, more solid in struct- 

 ure, with a more depressed spire, lighter color, and more scaly granula- 

 tions. From H. XieMiiiiana, Lea, it is readily distinguished by its large 

 umbilicus and difference of foT^m. San Pablo." 



The specimen I have figured above (Fig. 109) seems to correspond 



more nearly in shape with Dr. Newcomb's description than the shell 



I iG. no. received by me from him as H. Bridgesi and here figured 



(Fig. 110), The name FarJxeri was suggested by Mr. 



Tryon, as Bridgesi was preoccupied in the genus Helix. 



A small, globose, imperforate, thick form of var. 



reticulata, from Watsonville, Cal., is also figured. 



here (Fig. 111). 



Jaw of var. ramentosa stout, strongly arcuate, dark 

 horn-color, tranversely striate; ends but slightl}^ at- 

 tenuated, blunt ; anterior surface with 3 stout, widely 

 separated ribs on the central third of the jaw, their 

 Helix Bndgesi. ends projccting beyond either margin. 

 Lingual membrane of ramentosa (Terr. IMoll., Y, Plate IX, Fig. K) 

 with 60-1-GO teeth, with 20 perfect laterals. The eighteenth tooth 

 has the side cutting point, the twenty-first has a split inner cutting 

 point. 



