884 PELECYPODA. [Eul'iiif Ilihranchia. 



This species has a wide range of distribution. The type is from 

 the Mediterranean, and it also occurs at Maderia, Tenerife, from 

 Florida to Brazil, Red Sea, Ceylon, Philippine Islands, Darnley Island, 

 Louisiade Archipelago. In the Carribean Sea it has been dredged 

 in 640 fathoms. 



Fossil in the Pliocene. 



Subsp. multicostata, Sowerby, 1843. Plate 58, fig. 12. 



Lima multicostata, Sowerby, Thes. Conch., i, 1843, 85, pi. 22, f. 38 ; Conch. 

 Icon., xviii, pi. 1, f. 4 ; Chall. Rep., xiii, 288 ; Pritchard and Gatliff, 

 P.R.S. Vic., xvii (n.s.), 259. Radida lima, Angas, P.Z.S., 1865, 656. 

 Lima caribcea, d'Orbigny, Sagra's Hist. Cuba, Moll., ii, 337 ; atlas, 

 pi. 28, f. 17-19. 



This subspecies is distinguished from L. lima by the higher, narrower, 

 and thinner shell, and it has many more and finer ribs, their number 

 being about 30 to 35 on the disc, and the prickles on them are more 

 delicate. 



Diameter Ant.-post., 36 mm. ; dorso-ventral, 48 mm. : thickness, 

 20mm. 



Type in the British Museum. 



Hab. Bay of Islands. The type is very likely also from the 

 Mediterranean. The " Challenger " Expedition obtained the species 

 off Bermuda, in 1,075 fathoms ; off Tongatabu, in 18 fathoms ; and 

 in Port Jackson, in 2 to 18 fathoms. Tasmania and Australia. 



'2. Lima sydneyensis, Hedley, 1904. Plate 52, figs. 4, , b. 



Lima hrunnea, Hedley, P.L.S. X.8.W., 1901, 21, pi. 2, f. 7-9 ; not of Cooke, 

 1886. L. si/dneyensi*, Hedley, I.e., 1904, 200 ; Suter, T.N.Z.I., xxxix, 

 270. 



Shell thin, translucent, small, shaped like an axe-head, with no 

 gape, very inequilateral. Antei-intiy the shell is truncate for almost 

 the whole height, the truncated portion being sharply and deeply 

 infolded. A curve of half a circle is described by the ventral and 

 posterior margins. Cardinal area triangular, overhung by the incurved 

 beaks, and sharply defined by a ridge above. Sculpture : The whole 

 surface is evenly covered by fine close radiating riblets, which are 

 microscopically beaded, diverge from a median parting, and are occa- 

 sionally disjointed by concentric growth-Hues. Colour pale brown. 

 Interior polished, faintly tinged with purple. Margins denticulated 

 by the radiating riblets. Hinge-line short ; auricles almost obsolete. 

 Cartilage narrow, in an obliquely descending shallow sulcus, which 

 barely undulates the hinge-margin. 



Diameter Ant.-post., 6 mm. ; dorso-ventral, 8 mm. : thickness, 

 4 mm. 



Type in the Australian Museum, Sydney. 



Hab. Whangaroa Harbour (C. Traill). The type is from Port 

 Jackson, New South Wales. 



