ACADEMY OF NATURAL SCIENCES. 259 



Description of a new California Helix, with notes on others 



already described. 



BY J. G. COOPER, SI. D. 



Helix (Arianta) sequoicola, Cooper. 



Sp. cii. H. testa rotundata, umbilicata. spira depressa, anfr. ult. nonnunquam 

 subangulata ; anfr. vi ad vii et dimidiura, perist. obliqua superne parum deflecta ; 

 labio tenui, reflexo, infra crassiore, acuta. Colore atrobrunuea, vel olivacea, 

 zona nigra, lata, inter duabus ochraceis sita, in spira semicelata, labio albo ; 

 intus laete purpureo, zonis duabus albis. Epidermide nitente, infra polita, striis 

 incrementis Iseve perspicuis, interdura tenuissime malleata, rugis spiralibus; 

 supra pur.ctis piliferis creberrime induta ; pilis brevissimis junioris deciduis. 



Animal schisto-colore ; corpore cylindraceo rugosa, tentaculis longis, pede 

 postice elongata, cuneata. 



Testa lat., major, 0.93 ad 1.20 ; minor 0.76 ad 0.96 ; alt. 0.42 ad 0.54 

 poll. Angl. 



Hab. Santa Cruz, California, in ligno carioso, locis liumidissimis. 

 Specific characters. Shell rounded, umbilicate, spire depressed, last whorl 

 sometimes subangulate, whorls 6 to 6%, peristome oblique, little deflected above ; 

 labium thin, reflexed, thickest below ; acute. Color dark brown or olivaceous, 

 with a broad black band between two yellow ones, half hidden on the spire, 

 lips white; within a fine purple with two white bands. Epidermis shining, 

 polished below, the lines of growth faintly visible, sometimes very lightly malle- 

 ated, and with spiral ridges; above with crowded scars beariug very short 

 bristles in the young shell which fall off in the adult. • 



Animal slate colored, body cylindrical, rugose, tentacles moderate; foot 

 elongated, behind wedge-shaped. 



Shell— large diameter 0.96 to 1.20 ; smaller diameter 0.76 to 0.96 ; height 0.42 

 to 0.54 hundredths of an inch. 



Hab. Santa Cruz, Cal., among decayed trees in the dampest places. 

 This beautiful species is quite rare, only three adult and twelve young speci- 

 mens having been found after long searching. It will probably occur more 

 commonly in some part of the redwood forests which I have been unable to 

 explore. It approaches nearest to H. Dupetithouarsi and H. fidelis, being 

 between them in form and size as well as colors, but the pilosity at once distin- 

 guishes it. Its distinct bands and rounded -whorls separate it from H. infu- 

 mata and Hillebrandii, the latter when perfect having also much longer hairs. 

 The animal is lighter colored than those of H. arrosa, Niclcliniana, redimita, 

 ramentosa, tudiculata, (which are all very similar) but much darker than that 

 of Dupetithouarsi, and I believe also of fidelis and infumata. The form of the 

 shell is a link connecting those with Mormonum. 



In the tabular arrangement adopted in my State Survey Report, it would 

 come in as the pilose analogue of H. Dupetithouarsi, and H. exarata, which are 

 also its nearest geographical neighbors, as follows : 



