203 
some exquisite little specimens apparently the fry of Murex 
erinaceus. The whole shell (fig. 
1) is of a transparent horn brown 
colour, and is covered with raised 
reticulations most gracefully dis- 
posed ; those on the nucleus are 
longitudinal and transverse, en- 
closing minute square depressions ; 
while on the succeeding whorls they 
are diagonal in opposite directions, 
and form diamond-shaped areolae. 
The bivalves have at present en- 
gaged most of my attention, and 
several of them will deserve a short 
notice. One of the most remarkable 
2) which I refer to Anomia. It is trans- 
parent, and talclike in texture, 
and is very thin and delicate, so 
as to be almost always found 
more or less broken at the edges. 
Its substance is excavated by 
numerous tubes similar to those 
described by Dr. W. Carpenter 
in Anomia, and these tubes ra- 
j diate from the edge of the nucleus 
in all directions to the margin of 
the sheik The nucleus itself is 
very glassy and transparent, and 
full and rounded in shape, 
though still indistinctly triangular. 
But the singular feature in these specimens is that the growing 
shell, which completely surrounds the nucleus in the same 
way that it does in Ostrea, here leaves a small round hole on 
each side of the beak.— The fry of Ostrea edulis is common ; 
the foetal shell also occurs separate, and is readily distin- 
f 
