188 Mr. MoxTAGv's Account of some new and rare 
stance common in aquatic ivianan Vermes )and become 
a delicious repast to a variety of fishes. 
Mya STRIATA. 
Tas. XIII. Fig. 1.—A. 
Shell sub-pellucid, white, of a delicate texture, finely aan 
longitudinally: the shape is sub-parallelogramical ; the anterior 
end is truncated, and the valves reflect, forming a hiatus when 
the shell is closed ; the posterior end is rounded ; the umbo is 
small, and placed nearest the posterior end. The inside is white, 
and slightly reflects a nacred hue: the hinge is simple, and com- 
pletely that of a true Mya, possessing one erect broad tooth in one 
valve, that locks into a corresponding cavity in the other valve. 
. Length half an inch; breadth one inch. — — 
This new and interesting species, it appears, was discovered by 
Mr. Lyons in l'enby-bay, on the south coast of Wales, from whence 
specimens were sent to Mr. Norris, who obligingly favoured 
me with that from which the above description is taken; and I 
have been assured by the Rev. Mr. Bingley that several more 
have been very recently taken by the same gentleman after a 
storm, which were all alive. Round the anterior end of my spe- 
cimen there is a portion of agglutinated sand, which induces an 
opinion that, like most others of the same genus, it resides im- 
bedded in the sand at the bottom of the sea. 
- 
TEREBRATULA CRANIUM. 
Tar. XII. Fig. 2.—B. 
Terebratula Cranium. Mull. Zool. Dan. Prodr. 3006. 
Anomia Cranium. Gmel. Syst. vi. p. 3347. 
Shell ovate, convex, equilateral, inequivalve, the upper ne 
jecting considerably beyond the lower at the beak, where di isa 
. small 
