20 
* V. VIRGTNEA. Venus V. Turk Lin. Pen. Brit. Zo.> 
vol. 4, pi. 55, without a number. Stew. Elm., vol. 2, p- 
3112. Mont. Test. Brit., vol. I, p. 128. Venernpis V. 
Flem. Brit. An., p. 452. Not uncommon in St. Ausile 
bay ; and dead shells with the valves adhering, abundant 
in the mud taken up in deepening Falmouth harbour. R 
is also one of the shells that came from the stream work, 
now abandoned, at Pentewan. 
* V. PERFORANS. Venus P. Mont. Test. Brit., vol. 1, 
p. 127, pi. 3, fig. 6 . Flem. Brit. An., p. 451. 
Montagu observes, “ This species at first sight might 
readily be confounded with llic young of the V. Decussata ; 
but the slender and recurved teeth is a discriminating cha- 
racter, if all others were wanting. It rarely exceeds three 
eighths of an inch in length, and five eighths in breadth. With 
respect to shape it is difficult to fix any as a permanent 
character; it is however most frequently subrhomboidal ; 
sometimes nearly as long as it is broad, generally straight 
on the front margin, but in some instances deeply sinuons or 
indented; not very unlike Mr. Pennant’s figure of the V- 
Sinuosa. We found this species in abundance on the shore 
near Plymouth, burrowed in hard limestone, detached frag- 
ments of which were perforated in all directions, and stuck 
full of them.” 
From these remarks it would appear that Montagu had 
never seen this shell, except as imbedded in a substance 
that modified its character and perhaps stunted its growth. 
Dr. Fleming describes it as in length about an inch, breadth 
two inches and half. But a specimen which I have obtained, 
that had never been embedded in stone, answers more cor- 
rectly to Montagu’s figure and description, than to any other 
which I have had an opportunity of inspecting. It is not 
easy to suppose that the figures given in Crouch’s Intro- 
duction to Lamarck, pi. 5, fig. 5, and the Journal of Science, 
vol. 14, pi. 5, fig. 42, can apply to the same species. 
V. IRU 8 . Donax Irus. Turt. Lin. Tellina Cornubiensis- 
Pen. Brit. Zo,, vol. 4. Boriase’s Nat. Hist. Corn., pi- 
28, fig. 23. D. I. Mont. Test. Brit., vol. 1, p. 108 - 
Venernpis I. Flem. Brit. An., p. 451. Rare. Borlase 
found it in the west of the County. 
* V. SARN1ENSIS. Flem. Brit. An., p. 452. Several 
specimens which I assign to this species, from Falmouth 
and St. Austle bay. 
NYMPH A CEA. 
Two cardinal teeth at most, on the same valve. Shell 
often slightly gaping at the. lateral extremities. Ligameo*' 
external. Nymphae generally projecting externally. 
