20 PROCEEDINGS OF THE CALIFORNIA 
slender elongated form is always connected with many whorled species, having 
a rather narrow aperture in the shell. 
Specimens from Alameda Canon, about lat. 37° 30’, its most southern known 
range, have the scaly epidermis as much developed below as above. As in 
bristly species this roughening seems to aid in concealing the shell by retaining 
a coating of mud. 
Mr. G. W. Dunn has found many of this species on the branches of Buckeye 
trees (sculus) near Baulines Bay, showing another resemblance to its ally 
H. fidelis. 
Dr. Yates has found it near Calistoga, Napa Co. 
I have also found banded young of all ages under the loose bark, up to 
20 feet above the root of a dead tree, at Haywards. 
Glyptostoma Newberryana W.G.Binn. In the Amer. Jour, of 
Conch. V, 190, Bland & Binney call this a ‘‘ true Helix,’’ but from their de- 
scription of jaw and teeth merely prove that it is neither a Macrocyclis nor a 
Zonites. Since then they have made it the type of a subgenus Glyptostoma, 
from the grooves in aperture, According to the Agassizian rule, the external 
form of the shell is enough to separate it from the same sub-family with any 
type of Helix. The animal differs materially also as follows: 
‘Length 14% times the width of shell, spiracle just above middle of its back 
when creeping, only 4 inch from angle of aperture. Granulations very long 
and coarse, reticulately furrowed between, and one straight furrow running 
obliquely down from spiracle toward mouth on right side of body, about five 
furrows above, and five below it. A distinct furrow around flattened margin 
of foot, with branches connecting it with another close to edge. Tail flattened 
and obtusely wedge-shaped without mucous gland. Hye-pedicles nearly one- 
third of length of body, and like lower tentacles, finely granulated. Foot 
narrower than height of body. Color smoky gray, foot paler beneath, edge 
of mantle yellowish. 
The form of the animal is indeed almost the same as in our species of 
Macrocyclis (and this of course is connected with the similar form of the 
shell), but the external characters otherwise differ as well as the jaw and 
teeth. 
Genus Mersopon Raf. Rafinesque’s ‘‘General Account, etce.,’’ 1818, 
mentions as found in Kentucky, of ‘‘Helix four species,’’ while his descrip- 
tions of Mesomphix, etc., distinctly state that he considered the typical 
Helix imperforate, no doubt adopting the type of his friend Risso (and 
of Leach?), viz.: aspersa (=‘‘grisea L.’’ teste Hanl.) Taking W. G. 
Binney’s list of species of the ‘‘ Interior region,’’ it is easy to identify the 
four nearest to that type, viz.: albolabris, multilineata, Pennsylvanica, Mitchel- 
liana. His ‘‘ twelve species of Mesomphix’’ include some of Macrocyclis, 
Zonites (and Patula?); his ‘‘ Trophodon, ten species,’’ must include the 
‘*Odotropis’’ of next year. Both are from the same Greek words, meaning 
“toothed whorl.’’ From his later ‘‘ Enumeration, etc.,’’ 1831, it appears 
that he divided T’rophodon into three groups, giving the name ‘‘ Mesodon, 
1819,”’ to the first, though it is known only as a catalogue name, the M. leu- 
codon of that date. The description “Differs from Helix by lower lip 
