REPORT ON THE LAMELLTBRANC'HIATA. 255 



lAmopais .itraminea, ii. sji. (PI. XVTTl. figs. 5— 5a). 



Testa peroblique ovata, inseqiiilateralis, sulx-ompressa, alba, nitida, epirlermide 

 fil)rosa straminea plus miuusve induta, incremeuti liiieis striata, striis radiantibus 

 pimctatis s(!ulpta. Mavgo valvarum uudique convexus, acutus. Latus anticum angus- 

 tum, posticimi latum, dilatatum. Dentes cardiuis circa duodecim, insequales. Pagina 

 interna lactea, prope lineam pallii radiatim substriata. Area ligamenti parva. 



This is an oblique species, irregularh^ ovate, liroader behind thnn in front, having 

 all the margins more or less convex. The hinge-line, however, is almost rectilinear, and 

 the front portion of the ventral outline, which ascends obliquely, is rather straight. The 

 A^alves are very inequilateral, thinnish, pure white, and clothed to a great extent with a 

 straw-coloured fibrous epidermis. The umbones ai-e elevated a little above the hinge- 

 line, are devoid of epidermis, and are slightly separated. The sculpture consists of fine 

 radiating strias, which are in a great measure interrupted liy the concentric lines of 

 growth, and have on this account a somewhat punctate appearance. The interior is 

 milk-white, dull at the centre of the valves and glossy towards the margin, and exhibits 

 uumerous substri^e directed from the pallial line towards the umbones. The hinge- 

 plate is thinnish, and armed with about a dozen unequal denticles. 



Length 20 mm., height 15;j, diameter 8. 



Habitat. — Station 150, between Kerguelen and Heard Islands, at a depth of 150 

 fathoms ; coarse gravel. 



Limopsis torresi, n. sp. (PI. XVIII. figs. 4— 4a). 



Testa parva, convexa, leviter obliqna, altior quam longa, alba, costis concentricis 

 (irassiusculis, lirisque tenuibus radiantibus cancellata. Margo dorsi rectus, brevis ; 

 umbones parvi, supra marginem parum producti; linea cardinis mediocriter angusta 

 dentibus cii-citer octonis in medio interruptis instructa; pagina interna subnitida, 

 obsolete radiatim striata, margine externo intus deuticulato. 



This is a small, rather convex shell, higher than long, obliquely roundish, white 

 and finely cancellated by fine concentric ribs, and as a nde rather finer radiating lirse, 

 the points of contact becoming a trifie thickened or subnodose. The beaks are small, not 

 quite contiguous, and just a little elevated above the dorsal line, which is short and 

 straight. The hinge-plate is not particularly broad, and is furnished with about eight 

 denticles, there being four on each side of a small central smooth space. The interior 

 is not very glossy, exhibits more or fewer radiating striae, and has the outer margin, 

 especially the lower part, denticulate wathin. 



Length 3^ mm., height ^^, diameter 2j. 



Habitat. — Station 185b, Raine Island, Torres Straits, in 155 fathoms; coral sand. 



