TEREBRATULA. 
Terespratuua, De Lamarck. 
Awomta, Linnaeus, Gmelin. 
CHARACTER GENERICUS. 
Testa bivalvis, inequivalvis; valve convexe; majore 
umbone producta, rostriformi, perforata; minore 
processu  utrinque interne osseo instructa: cardo 
bidentata. 
ANIMAL processu tubiformi, brevi per foramen exe- 
unte aflixum: brachus duobus elongatis, retractili- 
bus, per totam longitudinem ad unum latus ciliatis, 
TEREBRATULA. 
GENERIC CHARACTER. 
Shell bivalve, unequal-valved ; valves convex ;_ the larger 
valve with the beak produced, rostriform, and perforated ; 
smaller valve with a bony process on either side, and a 
hinge with two teeth. 
ANIMAL affixed by a short tube-like process which passes 
through the perforation at the beak: arms two, elongate, 
retractile, ciliated along the whole of one side. 
The Terebratule are not only highly interesting to the 
Zoologist, from the curious structure of the animal, but 
are of great importance to the geologist, who by means of 
the various species which occur in a fossil state, is enabled 
to ascertain with great accuracy the kind of bed or stratum 
in which they may be included. 
This genus might perhaps be distributed into several 
