20 



* V. VIRGINEA. Venus V. Turt. Lin. Pen. Brit. Zo., 

 vol. 4, pi. 55. without a number. Stew. Elm., vol. 2, p. 

 382. Mont. Test. Brit., vol. 1, p. 128. Venerupis V. 

 Flem. Brit. An., p. 452. Not uncommon in St. Austle 

 bay ; and dead shells with the valves adhering, abundant 

 in the mud taken up in deepening Falmouth harbour. It 

 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 the 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 sinuous 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. IRUS. Donax Irus. Turt. Lin. Tellina Cornubiensis. 



Pen. Brit. Zo., vol. 4. Borlase's Nat. Hist. Corn., pi. 



28, fig. 23. D. I. Mont. Tes*. Brit., vol. 1, p. 108. 



Venerupis I. Flem. Brit. An., p. 451. Rare. Borlase 



found it in the west of the County. 

 4 V. SARNIENSIS. Flem. Brit. An., p. 452. Several 



specimens which I assign to this species, from Falmouth 



and St. Austle bay. 



NYMPHACEA. 



Two cardinal teeth at most, on the same valve. Shell 

 often slightly gaping at the lateral extremities. Ligament 

 .externa), Nymphre generally projecting externally. 



