8 THE SPECIES OF 



narrow in proportion to the length of the shell ; tentacles short. 

 Gregarious, inhabiting dry gullies and hill sides ; many specimens 

 found in a cabbage garden." (Thomson). 



This shell varies very considerably in size and in the 

 elevation of its spire. This fact will account for the differ- 

 ence in the figures referred to in the synonymy. That of 

 pi. vi. a, is a perfect representation of what Lea's original 

 specimen would be in a fresh state. 



Helix Californiensis of Pfeiffer, Chemnitz, and Reeve, 

 are to be referred to this species. Those authors are in- 

 correct in considering H. Nickliniana a variety of H. Cali- 

 forniensis. 



H. arboretorum is placed by Pfeiffer doubtfully in the 

 synonymy of H. Californiensis, while H. nemoraviga is 

 placed among the uncertain species. A fac-simile of Va- 

 lenciennes's figure of the former is given, pi. 76, fig. 13, 

 and of the latter on pi. 79, fig. 11. 



I have described, under the names of H. redemita and 

 H. intercisa, the shells figured on pi. vi. as varieties of this 

 species. 



HELIX INTERCISA. 



PLATE VI. FIGURE 1. Middle figure. 



Testa solidissima, luteo-cinerea, apice rufa, globoso-conica ; spira bre- 

 vis ; sutura impressa ; anfractus quinque, convexiusculi, lineis parallelis 

 volventibus, valde demissis, strias incrementales clistinctas intercidentibus 

 notati ; anfr. ultimus globosus, supra peripheriam fascia unica, rufa ob- 

 scurissiina ornatus ; apertura inaxime obliqua, forma equi calcei, rotun- 

 data ; labrum albo-cinereum, incrassatum, subtus reflexiuscutuin, sub- 

 unidentatum, umbilicum totum tegens ; marginibus approxhnatis, callo 

 inter] unctis. 



SYNONYMS AND REFERENCES. 



Helix intercisa W. G. BINNEY, Proc. Acad. N. S. Phila. ix. p. 18, (Oct. 1857); 



Proc. Boston Soc. N. H. vi. p. 156; Notes, p. 1. 



Helix Nickliniana var. BINNEY, Terrestrial Mollusks, ii. p. 120 ; iii. pi. vi. f. 1. 



Icon in medioposita. 



