REPORT ON THE LAMELLIBRANCHIATA. 291 



Lima (Mantellum) loscombii, Sowerby. 



Lima loscombii, Sowerby, Genera Rec. and Fds. Shells, fig. 4. 

 Lima loscombii, Forbes and Hanley, Brit. Moll., vol. ii. p. 2iJ5, i>l. liii. figs. l-.'5. 

 Lima loscombii, Jeffrey.?, Brit. Coneli., vol. ii. p. 85, vol. v. jil. xxv. fig. 4. 

 Lima loscombii, Jeffreys, Proc. Zool. Soc. Lend., 1879, p. 564. 



Habitat. — Station 75, off the Azores, in 450 fatlioms, and oft' Nightiugah^ I.slauil, 

 Tristan da Cunha, in 100 to 150 fathoms. 



The distribution of this species, both recent and fossil, has ah'cady been given by 

 Jeffreys, Weinkauff, and others, but it has not, I believe, been previously recorded from 

 so southern a locality as Tristan da Cunha. 



Lima (Limatula) torresiana, n. sp. (PI. XXIV. figs. 5-5"). 



Testa perconvexa, sequilateralis, subovata, solidiuscula, costis radiantil)us subnodu- 

 losis 22-24 lirisque tenuibus confertis concentricis cancellata. Intcrstitia sul)profuiida. 

 costis angustiora, in medio lira filiforme sfepe bipartita. Umbones promincntes, involuti. 

 Area cardinalis elliptica, fossa ligamenti profunda sculpta. Pagina interna radintini 

 sulcata, margine exteruo fortiter dentato circumdiitii. 



This is a rather solid species, equilateral, very convex, somewhat ovate, and sculptured 

 with about twenty-four radiating riblets, which are prettily nodulose, the nodules being 

 compressed and very close together. The intervening sulci are somewhat narrower than 

 the costse, frequently have a very slender thread-like lira up the middle, and are crossed 

 by fine, closely packed, concentric lirse, which connect the nodules on the ribs, or in 

 other words they are continuous and somewhat thickened on crossing the ribs. The 

 umbones are fairly prominent, and well incurved at the tip. The hinge-area is of an 

 elongate elliptical form, and exhibits a rather sunken central diamond-shaped ligament- 

 pit. The interior is regularly grooved, the sulci corresponding to the extei-nnl eosta^, 

 and the outer margin is coarsely and bluntly dentate. 



Length 8 mm., height 10, diameter 7i. 



Habitat. — Station 18G, off Cape York, in 8 fathoms; conn mud. 



This is a shorter and much more strongly sculptured shell than Lima bullata. It 

 also closely approaches Lima japonica, (A. Adams) Sowerby, but not the Lima japoniru 

 of Dunker, which is a very different species, and may hereafter be called Lima dKnh'vi, 

 as Sowerby's shell has priority of publication. 



