LIMA. 85 



B. Shell inequilateral, with an oblique outline. 

 4, L. Loscom'bii *, G. B. Sowerby. 



L. Losco?nbii, Sow, G-en. Sh. (Lima) f. 4 ; F. & H. ii. p. 265, pi. liii. f. 1-3. 



Bod y bright orange-colour : mantle haying its edges over- 

 lapping one another in front : tentacles of different lengths, 

 ringed or verticillate as in some Nudibranchs, and arranged 

 in several irregular rows ; the front row is folded back over 

 the outer edge of the shell : foot cylindrical and extensile, 

 reddish-orange. 



Shell rhomboidal, twisted to one side, extremely convex, 

 thin, rather glossy : sculpture, 50-60 very fine and sharp ribs 

 or fluted striae, which radiate from the beaks to the front and 

 sides, but become faint or absent on the sides and near the 

 hinge ; the ribs are slightly flexuous and of unequal size, 

 often alternately large and small, or two or three small ribs 

 between some of the larger ones; there are also the same 

 microscopical transverse lines as in L. subauriculata and other 

 species, producing a similar serrature or corrugation of the 

 ribs : colour snow-white : margins thin, oblique, bluntly 

 rounded in front, ventral edge compressed and nearly straight, 

 posterior edge rounded and sloping from the front and hinge- 

 line to an obtuse angle about one-third down; the valves 

 when closed gape a little on the upper part of the dorsal side : 

 beaks extremely prominent and gibbous, projecting consider- 

 ably beyond the hinge : ears triangular and veiy small, wrin- 

 kled in the line of growth : cartilage large and yellow : liga- 

 ment thin, olive-green: hinge-line nearly straight, slightly 

 curved outwards : hinge-plate narrow and sharp : cartilage- 

 area broad ; triangular space on each side of the beaks and 

 within the ears small, but supported by a stout and somewhat 

 incurved ledge : inside pearly, slightly granular, showing (al- 

 though faintly) the impression of the outside ribs ; front mar- 

 gin crenulated in young, but thickened in adult specimens : 

 muscular and pallial scars distinct. L. 0*8. B. 0*55. 



Habitat : With the last species, and equally distri- 

 buted, but usually not so common nor at such great 



* Named in honour of Mr. C. W. Loscombe, who discovered this and 

 other shells at Exmouth. 



