249 
M. Rapiata of Brown, Is closely allied to M. Modi- 
olus, but is smaller, more delicate, covered with a yellow 
epidermis under which the white shell is, more especially 
at the anterior end, rayed with more or less crooked, 
crimson red wavy markings. 1. Tenby. 
M. Niera. Oblong, very short, rounded and narrow 
posteriorly, rather dilated anteriorly, margin nowhere 
angulated, ventral edge rather incurved ; cuticle yel- 
lowish black, sides radiated with raised striz which 
appear granular from the very fine concentric decus- 
sations, central area smooth; ligament scarcely visible 
externally. 4 single small specimen not one inch broad 
was found at Scarborough by W. Bean, Esq. Foreign 
Shells, (Newfoundland) are triple this size. 
Lima ApErRtTA Sow. Th. t. 22. f. 26,7, 8, 9,— 
OstREA Hans Gmel.—L. TENERA Turt. in Z. 
J. 5.—Pecten Fracinis Mont. Sup. p. 62.—Thin, 
subcompressed, obliquely oval-elongated, smooth at the 
sides, minutely striated in the middle, very slightly ga- 
ping posteriorly, widely so anteriorly; anterior gape 
margined by a strong internal rib ; anterior auricles 
acute ; hinge areasmall. Rare. 
Pecren AcuLEatus Jeffreys in Conch. Mag.— 
