260 



PROCEEDINGS OF THE CALIFORNIA 



I A. Shining ; 



band triple, not rugose, 



1. Avhorls 6 to 8. 



I B. Dark ; hirsute 



in the young, 

 1. whorls 6 to (S J^. 



\ C. Brown : baud 



single, rugose, sculptured, 



1. whorls 6 to 7. 



H. fidelis. 



H. TraskiLf 



H. Dupetithouarsi. 



IT. infumata.* 

 H. sequoicola. 

 H. Ilillebrandii. 



H. arrosa. 

 II. exarata. 

 H. Ayresiana. 



Judging from the form of H. Mormonum, it is possible that the young will 

 be found to be hirsute. 



The table refered to includes twelve other banded species of California, 

 arranged under the same headings. It is interesting to observe that the £ A 1 

 and B 1 groups inhabit coniferous forests, and probably feed chiefly on fungi 

 found in decaying wood while \ C, including also H. Nickliniana, Bridgesii, 

 redimita, ramentosa, tudiculata, Califomien&is (and Carpenteri ?) are found in 

 woods of oak, etc. Another group which I place in $ A (as not being 

 rugose) are found in dry, treeless localities where they seem to represent those 

 last mentioned, the size, form, and number of whorls furnishiug parallels, but 

 being usually less in size, as might be expected of species from arid regions, and 

 often with the baud single or obscured ; these are H. Tryontf, rvfocincta, 

 Kcllcttii, crebristriata, Gabbii,facta.\ 



The bandless species, of which there are few on this coast, present analogous 

 sections as to surface characters, and exhibit much greater varieties in the form 

 of their apertures, by which they cau -be arranged in groups, having a greater 

 development of species in the Atlantic States and more distinguishable by form 

 than by surface. 



H. Townsendiana alone approaches \ C in its rugose sculpture, but otherwise 

 differs greatly from the usual types of California. 



From the shells alone, five subgenera may be established out of the banded 

 group, which I will describe in a future article. 



Note. — There is a single specimen of Helix in the State Collection, supposed 

 to have been obtained in the Mount Diablo range by Prof. Brewer, which 

 closely resembles the small form of H. Sequoicola in shape, but being nearly 

 bleached is too imperfect to describe minutely, though very likely a new species. 



It is remarkable for having seven whorls, while the former and H. Mormo- 

 num of the same size have but six ; it is also less compressed than the latter> 

 and the umbilicus is less covered. The color where remaining is shiniug gam- 

 boge yellow (faded ?) with a single very narrow band above the middle, not 

 showing the pale baud on each side of it that is so marked in others of the group. 

 The sculpture seems to have been very slightly malleated, and with the faint 



* In this the band seems obscured in the general blackness of the shell: occasional vari- 

 eties of several others are found without the band, as if from disease, as in H. anachoreta. 



t These species have parallel spiral grooves, not ruga. 



