536 
naturalist’s calendar. 
Il Las much the same appearance as the circulation of the blood, but 
the globules are much fewer in number, and larger. It may be found 
rather difficult at first to obtain a good view of it, but it well repays 
the trouble attending it. 
68 
Molluscous Animals. The Mysca solida (5) is said by 
burton, to be found in the river Avon, near Bristol. The shell is 
stated to be two inches long, and three and a half broad, covered with 
a blackish brown skin. The Cyclas amnica (6) inhabits slow fivers 
and streams, in most parts of the country. The shell is three-eighths 
of an inch broad, brownish or bluish horn colour, sometimes yel¬ 
low towards the margin, produced and narrower on one side, often 
covered with a rusty coat. The C. appendiculata ( 7) is about half 
the size of the last, and is found in similar situations, but is very 
rare. The Clausilia biplicata (8J inhabits woods and close hedges. 
The shell is nearly three quarters of an inch long, of a dark grey 
colour, and consisting of eleven or twelve rather flat but well de¬ 
fined volutions. Also in beech woods, among decayed leaves, the 
C. laminata (9) shelters. This shell is about, half an inch long, and 
of a reddish horn colour. 
The Musk Ox has many striking peculiarities which appear to 
give it an alliance to the goat rather than the ox. The singular 
secretion of musk, which so strongly pervades and taints its flesh, 
particularly the heart and kidneys, not only indicates a similarity in 
secretory organs with the species of deer which yields that drug, but 
may, from these circumstances, lead to a reasonable inferential con- 
