THE NAUTILUS. 105 
assistant and I proceeded to “bag” the leaf mould. While doing 
so another new thing attracted my attention. Upon comparing it 
with asingle specimen of Z. dimatulus Ward in my collection, I 
pronounced it the same with a question and sent it to the Editor for 
verification. He writes “ Your /imatulus I find, on comparing with 
typical specimens, are much flatter and have wider umbilicus. I 
therefore, call them Gastrodonta (Pseudohyalina) latewmbilicata n. 
” 
sp. 
Daylight failing and being a mile from home in a ravine 500 feet 
below home level, and only the bed of a mountain torrent for foot- 
path, we could only carelessly collect the bushel of mould which we 
brought away, doubtless leaving many specimens. Upon assorting 
the material the following was the result: 
Ferussacia subcylindrica L., 245. Pomatiopsis lapidaria 48. 
Gastrodonta latewmbilicata Pils., 200. 
G. eapsella Gld., 25. Z. indentatus Say, 18. 
G. interna Say, 18. Helicodiscus lineatus Say, 5. 
Patula perspectiva Say, 51. Helix spinosa Lea, 1. 
H. stenotrema Fer., 3. H. inflecta Say, 4. 
A subsequent visit to another part of the same ravine resulted in 
the finding of 50 more specimens of G. latewmbilicata, but none of 
F. subcylindrica. J have since received two specimens of the latter 
from another locality not far distant. 
This trip also resulted in the finding of two living specimens of 
Gastrodonta acerra Lewis, the gem of our American Zonites. A 
number were also found which had been broken into and eaten. 
Query ; may not-the rarity of this species be due to its delicate 
shell and habit of remaining among the loose leaves rather than 
burying itself in the mould as does its more thrifty neighbor 
Omphalina laevigata Pfr. ? 
This is thus far the only station at which I have found G. acerra. 
A new species of Somatogyrus for which the name Somatogyrus 
sargenti Pils. is proposed, is found in considerable numbers, twenty 
miles northeast of here in a spring, tributary to Mud Creek, which 
is in turn tributary to the Tennessee River. It is found attached 
to the dead leaves in company with one species each of Physa, 
Planorbis, Limnaea and Goniobasis. 
