268 DR. L, PFEIFFER ON NEW LAND SHELLS, [Nov. 25, 
The Beaver, the subject of the foregoing remarks, was presented 
to the Society by the Hudson’s Bay Company, in the autumn of 
1861, and was probably then about six months old. It is, no doubt, 
less vigorous than the large wild animals of this species, who would, 
in all probability, brmg down trees of much larger dimensions in a 
shorter time. In fact, it was evident that our Beaver was a novice 
in the undertaking, as he more than once slipped and rolled over on 
his back in his eagerness to accomplish the task. It was impossible to 
witness the actions of this animal without being struck by the amount 
of skill and intelligence exhibited. When the space cut through 
towards the centre was too narrow to admit its head, its teeth were 
applied above and below so as to increase the width from the outside 
towards the centre, until the remaining parts above and below formed 
two cones, the apices of which joined in the middle. Again and again 
the animal left off gnawing, and, standing upright on its hind legs, 
rested its front feet on the upper part of the tree, as if to feel whether 
it was on the move. This showed clearly that the creature knew 
exactly what it was about, 
7. DESCRIPTIONS OF THIRTY-SIX New LAND SHELLS, FROM THE 
CouLecTIon oF H. Cumine, Ese. By Dr. L. Preirrer. 
(Plate XXXVI.) 
1. Hexix pans, Pfr. (172 6). 7. angustissime umbilicata, sub- 
turbinata, solida, superne confertim arcuata, plicatula, stris 
spiralibus obsolete decussatula, cinnamomea ; spira convexius- 
culo-turbinata, vertice minuto ; anfr. 64, convexiusculi, regula- 
aiter accrescentes, ultimus non descendens, medio subcarinatus, 
basi subtiliter striatus, pallidus ; apertura obliqua, lunaris, 
intus submargaritacea ; perist. simplex, rectum, margine colu~ 
mellari subarcuato- declivi, sensim ad insertionem subdilatato, 
Diam. maj. 32, min. 29, alt. 19 mill. 
Hab. Lao Mountains, Camboja (Mowhot). 
2. Hexrx mitts, Pfr. (447 a). 7. umbilicata, convexo-depressa, 
tenuiuscula, levigata, diaphana, alabastrina ; spira parum ele- 
vata, conoideo-convexa; sutura submarginata; anfr. 5, con- 
vexiusculi, sensim accrescentes, ultimus subdepresso-rotundatus ; 
umbilicus angustissimus, vix pervius ; apertura parum obliqua,. 
lunaris, intus nitida ; perist. simplex, rectum, marginibus via 
convergentibus, columellari arcuato, superne subdilatato. 
Diam. maj. 162, min. 154, alt. 83 mill. 
Hab. Lao Mountains, Camboja (Mouhot). 
3. Hexix piuto, Pfr. (595 5). T. umbilicata, depressa, soli- 
dula, superne striis spiralibus et aliis antrorsum descendentibus 
minute sculpta, nitidula, fusco-nigricans, fasctis nonnullis pal- 
lidioribus notata; spira breviter conoideo-elevata, vertice ob- 
tusulo; anfr. 54, convexiusculi, ultimus magnus, supra medium 
