m MOLLUSCA. LUCiNADiE. Lucina, 
Peciunculus subfuscus, List. Conch, t. ccxciii Tellina radula, Mont. 
Test. Brit. 68. t.ii. f. 1, 2 — Venus borealis, Don. Brit. Shells, t. cxxx. 
— L. radula, Turt. Biv. Brit. 116 — Deep water on various parts of the 
coast. 
Diameter about an inch and a half ; white ; lenticular, the margin slightly 
iiTegular retrally ; beak prominent, slightly inclining ; the concentric striae 
in the young shell are very regular (in which slate it appears to be the L. alba 
of Dr Turton, Biv. Brit. 114. t. vii. f. 6, 7*)? hut with age they become irre- 
gular, and less distinct towards the margin ; one of the hinge teeth cloven ; 
right valve with an anterior lateral tooth. 
505. lu.Jlexuosa. — Obsoletely striated transversely; the beaks 
prominent, and the retral margin much waved. 
Tellina flexuosa, Mont. Test. Brit. 72 — Cryptodon flexuosus, Turt. Biv. 
Brit. 121. t. vii. f. 9, 10 — Not uncommon from Devon to Zetland. 
Diameter scarcely half an inch ; white, thin and translucent ; two grooves 
on the retral extremity, extending from the beaks to the margin, and a 
rounded depression before the beaks ; the teeth are indistinct, seldom more 
than one tooth developed in each valve. It bears a very close resemblance 
to L. pennsylvanica, List. Conch, t. cccv. 
Strice oblique and arched (Strigella of Turton). 
506. L. carnaria. — Oval, inequilateral, with oblique strias in 
three directions, forming acute angles retrally, and waved arches 
anteally, 
Pectunculus tenuis. List. Conch, t. cccxxxix — Tellina carnaria, Linn. 
Syst. i. 1119 — Pult. Doiset. xxx — Don. Brit. Shells, t. xlvii Mont. 
Test. Brit. 73 — Strigilla carnaria, Turt. Biv. Brit. 117 — Weymouth 
and Poole, Dr Pulteney. 
Diameter about fths of an inch ; white, more or less tinged with rose-co- 
lour, back a little inclining, under which is an oval impression. 
507. L. pisiformis. — Shell somewhat globular, and nearly 
equilateral, with oblique longitudinal striie on one side, forming 
acute angles, on the other waved. 
Tellina pisiformis, Linn. Syst. i.tll20. — Cardium discors, Mont. Test. 
Brit. 84 — Strigilla pisiformis, Turt. Biv. Brit. 119 — One dead speci- 
men found at Falmouth by Mr Montagu. 
Diameter about a quarter of an inch ; convex, glossy white ; beaks small, 
inclining ; two teeth in one valve, one of which is very small, one in the 
other, with remote lateral teeth like laminae. The Strigilla divaricata of 
Bivalvia Britannica,” appears to belong to this species. “ Shell half an 
inch in diameter, white, thin, brittle, orbicular, with a slight flexuosity on 
the hinder side, rather convex, with regular but not very close striae, which 
form rather oblique curved lines, and turn off at both the sides nearly in 
right angles ; beaks central, very prominent ; hinge with a single cloven 
tooth in one valve, closing between two plain ones in the other ; the lateral 
teeth remote and small.” Shores of Teignmouth. 
508. L. arcuata. — Orbicular, with oblique doubly waved strise. 
Cardium ar. Mont. Test. Brit. 85. t, 3. f. 2 — Falmouth harbour. 
Diameter about half an inch ; white, thin, fragile, finely and regularly 
striated obliquely, with a few irregular concentric furrows ; beak central, 
pointed and arching ; hinge with one primary tooth in each valve, lateral 
teeth remote. 
