LAMELLIBRANCHIATA. S3 



124. L. squamosa, Lamark, I.e., vii., p. 115. Oval, depressed, 

 oblique, with about twenty radiating ribs with distant projecting 

 scales ; hinge oblique ; margin plicated. White, the ribs sometimes 

 yellowish. Height, 175 ; length, TO. 



Stewart's Island. Australia. Bed Sea(?). America. China. 

 Japan. 



125. L. (Limattlla) bllllata, Bom, Lamarl; I.e., vii., p. 118. 

 Oblong, narrow, inflated, sub-equilateral, with fine radiating ridges, 

 smooth on, the umbones ; ears sub-equal ; thin ; white. Height, '7 ; 

 length, -!. 



Stewart's Island. Tasmania. 



FAMILY ANOMIIDJE. 



Largely indented or with a variously formed opening near the 

 summit of the inferior valve, for the passage of the adductor muscle, 

 which is attached to a plug that adheres to foreign bodies. 



ANOMIA. 



Shell not eared, upper valve with three sub-central muscular scars ; 

 the anterior upper lobe of the notch separated from the cardinal edge ; 

 plug entirely shelly, and quite free from the edge of the notch. 



Europe. China. Philippines. "West Indies. Peru. California. 

 Singapore. Indian Ocean. Australia. 



126. A. Stowei, sp. nov. Sub-orbicular, thick, solid, lower valve 

 smooth ; yellowish white ; interior dark green ; notch large, ovate, 

 anterior lobe widely separated from the cardinal edge ; muscular im- 

 pressions two only, strongly marked ; upper large, broadly oval or sub- 

 orbicular ; lower much smaller on the posterior lower edge of the 

 larger, and confluent with it, sub-orbicular. Diameter, 3'5. 



Pictori. 



127. A. alectUS, Gray, Proc. Zool Soc., 1849,^. 117. Irregular, 

 thin, upper valve convex, reddish, internally pearly ; lower valve 

 yellowish white, interior pearly, with green reflections ; upper scar 

 large, sub-orbicular; lower scars two, large, smaller than the upper 

 one, close together but not confluent, about equal in size, and on the 

 same line. Diameter, about 1'5 or 2. 



Stewart's Island. Peru. 



128. A. cytaeum, Gray, Proc. Zool. Soc., 1849, p. 115. Sub- 

 orbicular, flattish, smooth, slightly plicated obliquely ; interior white, 

 pearly ; upper scar large, sub-cordate ; lower two smaller, the central 

 transversely oval in the notch of the upper one, the lower orbicular 

 close to the lower hinder edge of the central one. Diameter, 2. 



Stewart's Island ; a single upper valve only. China. 



PLACUNANOMIA. 



Shell not eared ; upper valve with two sub-central muscular scars ; 

 the anterior lobe of the upper notch agglutinated to the cardinal edge ; 



