PACIFIC COAST SPECIES. 



127 



Fig. 97. 



Fig. 98. 



A. Holdcriana. 



Helix wruginosa, GouLD, Proc. Post. Soc, v, 127 (1855) ; 



Terr. Moll., iii, 12.— W. G. Binney, Pac. R. R. 



Rep., vi, 113 (1857) ; preoc. in Helix, not in Ari- 



onta. 

 Helix arrosa, Gould, in litt. ; Otia, 215. — \V. G. Binxey, 



Proc. Acad. Nat. Sci. Philad., 1857, 185; Terr. 



Moll., iv, 15, pi. Ixxvi, fig. 4 ; L. »fe Fr.-W. Sh., 



i, 163 (1869).— Pfeiffer, Mon. Hel. Viv., iv, 350., 

 Aglaja arrosa, Tryon, Am. Journ. Conch., ii, 311 (1867). 

 Arionta arrosa, W. G. Binney, Terr. Moll., v, 354. ^ arrosa. 



In the Califoruian RegioD, Santa Cruz to Mendocino County, two hun- 

 dred miles along the coast, only twenty-five miles inland. (Cooper.) 



1 have in my cabinet an albino form, and speci- 

 mens very much smaller than that figured. The 

 latter variety, called Holderiana by Dr. Cooper, is 

 figured here, as well as that he calls var. Stiversi- 

 ana. On these there are more decided revolving 

 lines on the upper surface of the shell, and granula- 

 tions running sometimes obliquely to the lines of growth. A careful ex- 

 amination of numerous specimens of arrosa convinces me that the two 

 varieties differ only in the greater development of the revolving lines and 

 granulations. 



The epiphragm is white, thick, membranous. 



Jaw arcuate, of uniform breadth throughout ; ends 

 blunt 5 anterior surface with a few (G) rather distant, 

 stout ribs, crenulating both margins (see Fig. 96). 



The lingual membrane (Terr. Moll., V, Plate IX, Fig. 

 D) has 54-1-54 teeth, 17 laterals, 180 rows. Teeth of 

 the type usual in the genus. 



The genitalia (Terr. Moll., Y, Plate XIII, Fig. I) are as in A. Niclc- 

 liniana. The penis sac is extremely long and gradually tapers into a 

 flagellum. It receives the retractor muscle beyond the middle of its 

 length, and the vas deferens at three quarters of its length from the 

 vagina. The genital bladder is very small, oval, on a very long duct, 

 which has a very long, stouter accessory duct {a d). The vaginal pros- 

 tate, with its bifurcate flagellum, was not present, or was not noticed 

 by me, in an individual whose genital system was formerly described 

 and figured by me. I have recently observed it in numerous speci- 

 mens, and it is figured by Semper (Phil. Arch., Plate XY, Fig. 13). 

 tZ s is a dart sac. The dart is short, stout, acuminated, on a broad, 

 flat base. 



Fig. 99. 



A. Stiversiana. 



