40 
as high as the diameter of ihe valve. From this the beak 
is bent down, and small. The specimen described, which 
was attached to the shell of a pinna, has the summit in- 
flated and round ; but a specimen which l found 
Mount’s bay attached to sea-weed, was about equally 
elevated but pointed. Further research will deci'> e 
whether these specimens belong to the same species. >° 
another specimen, found with the former in Mount’s bay* 
the beak approached but did not join the margin ; a" 1 
the upper valve was characterized by a number of tf e * 
marked circular raised ribs. 
BRACBIOPODA. 
The shell bivalve, adhering either directly or by a tend 1 ' 
nous cord. 
TEREBRATULA. 
GENERIC CHARACTER: Shell with valves unequal 
regular, subtriangular, attached to bodies by a short ten- 
dinous pedicle; beak of the larger valve produced, oft® 
curved, perforated at the summit; binge with two teeth’ 
two nearly bony, slender, elevated, forked, variously 
branched processes rise from the disk of the small val' 15 ’ 
and support the animal. _ . s 
I found the toothed valve of what I believe a species 0 
this genus, at Par : but the precise species is uncertain. 
CLASS IV. 
MOLLUSC A. , d 
The body sometimes naked, either destitute of any sol' 1 
internal parts, or inclosing a shell or other hard substanc 1 ’ 
and sometimes provided externally with a shell covering 
sheathing, but never composed of two opposite valves unit 
^The distinguishing character of the Mollusca is, that 
have no vertebrae, are wholly without articulations, and h® 
a more or less prominent head at the anterior part ot 1 
body. Their instincts are more developed than any of 1 
species already enumerated. 
V BY LLI DIANA. f 
Some have no shell, either within or without; others 
wholly or in part covered by a shell, sometimes compose^ 
one single piece, sometimes of a range of moveable a 
distinct pieces. 
CHITON. 
GENERIC CHARACTER: Shell 
pieces, in number from eight to 
formed of 
fastened 
six 
sepa r ^! 
togetk 6 
