60 
MYTILUS Brardii. 
TAB. DXXXII.—fig. 2. 
Spec. Cuar. Convex, straight, pear-shaped, elon- 
gated; beaks acute, terminal (within each 
beak a plate is extended to the opposite edge 
for the support of a tendon, and within that is 
a flat angular process). at 
Syn. Mytilus Brardii. Faujas, Ann. du Mus. 8. 
t. 58. f. 11 & 122? » Brongn. Ter. du Vicentin. 
78. t. 6. f. 142* Basterot, Mem. de la Soc. 
d’ Hist: Nat. 2. Part 1, 78. 
eer Pree 
A ratuer variable shell, its surface being generally 
convex with an‘approach to keel-shaped near the pointed 
beaks. Specimens from Dax are often sharply keeled 
for nearly half their length, and the rest is antiquated. - 
The plate which extends across the cavity within each . 
beak, bears a small muscular impression, analogous to 
that upon the surface near the beak in most other 
Mussels. 'The only other species that has a similar sup- 
port for the attachment of the smaller muscle or tendon, 
whichever it may be, is the Freshwater one, M. poly- 
morphus, found in the Danube and most of the rivers 
in the north of Europe, and lately in the Commercial 
Docks and Surry Canal, near London ; anda small one 
often brought from the coasts of Africa (M. murinus? 
of Gmel.). The former is well distinguished by its curved 
very deep keel-shaped valves, and by having in general 
an irregular thin septum within and parallel to the 
* The figures given by Faujas and Brongniart are both un- 
satisfactory. 
