ACADEMY OF SCIENCES. LG 
impressed grooves on the body whorl, parallel to the suture, asin Townsendiana, 
fidelis, etc. Others from Point Reyes, Marin Co., are similar, with only 
6 whorls. This is possibly Lea’s original ‘‘ Nickliniana,’’ which was ‘‘longi- 
tudinally strite,’’ but the striz are not mentioned by later describers, and the 
‘*5 whorls, whitish, mottled, paler beneath, size 90 by 70, locality San Diego,’’ 
of Lea, cannot be made to apply to it. 
Mr. Carlton received specimens from Sonoma Co. (Healdsburg?) with the 
same revolving grooves, but more like var. Holderiana. 
The animal of arrosa is smoky-gray, about twice as long as the width of 
shell, coarsely granulated, the tips of granulations paler; eye-pedicles % of 
total length. Foot very broadly expanded, nearly three times the width of 
body, its margins flattened above. 
One from east of San Leandro is a typical small arrosa. 
H.tudiculata Binn. This species approaches the coast farther north 
than before reported, being found in considerable numbers in the bottom land 
of Santa Clara River, six miles east of San Buenaventura, where it lives in 
colonies near a colony of H. Traskii, but without any intermingling of the 
two species. I found one which had been injured when half-grown, and after- 
wards formed another whorl without a band, showing that this variety is the 
result of disease. 
They grow only half their greatest size there, it being rather too dry a 
climate, but the first locality south of Monterey in which a valley runs direct 
to the ocean from the Sierra Nevada, where they are more perfect. Two 
species of Succinea seem to have followed the same outlet to near the coast. 
(See notes hereafter.) 
These shells come very near ‘‘ Nickliniana’’ Lea. A tracing of his figure 
laid over Binney & Bland’s fig. 287 (var. ‘‘cypreophila’’), agrees almost 
exactly, but Lea’s description appears mixed with a var. of Californiensis 
(and of Kellettii ?). 
H. Kellettii Fbs. and vars. In the descriptions of vars. Tryoni and 
crebristriata (Proc. Cal. Acad. III, 116), forms are mentioned as sometimes 
larger, angled, or with lips enormously thickened and connected by a thick 
callous deposit on the parietal wall. I found these on the islands to which 
the two varieties mentioned are now confined, the fossils of the two being 
undistinguishable, except that those of var. crebristriata have the tubercle of 
var. Tryoni even more developed than in the living form of the latter (which 
does not now exist on the same island), while those of var. Tryoni have the 
‘ deep striz of crebristriata well developed. 
These were among the proofs on which I considered ‘‘ H. Tryoni’’ a var. 
of Kellettii in a former article. 
In the Journ. de Conchyl. for 1861, Pl. VIII, f. 12-16, are represented 
fossils from Algeria bearing similar relations to species now living there. 
Crosse also notices their similarity to the living H. dentiens of the West Indies 
(belonging to the subgenus Dentellaria, apparently not very different in animal 
from Helix § Arionta). This, together with other Algerian species, both recent 
Proc. Cau. AcaD. Sci., Vou. VI.—2. 
