FROM THE SOLOMON ISLANDS. 501 



postice rectiusculus ; latus anticum rotmi(latum, latum. Lat. 23 

 mill., long. 14, crass. 6^ 

 Hab. Sow-and-Pigs Reef, Port Jackson. 



The granulation of the surface is so minute as scarcely to be 

 noticeable with the aid of a simple lens ; and consequently the 

 valves appear to be but concentrically striated. The posterior 

 end of this species is narrower than the anterior, whilst in 

 JaeJcsoniana it is broader. 



93. Thracia Jacksoniana, sp. nov. Pi. XXX. fig. 24. 



Testa alba, ovato-oblonga, postice biangulata, rotunde truncata, antice 

 aliquanto angustata et rotundata, subsequivalvis, paululum insequi- 

 lateralis, concentrice leviter plicata, ubique minute granose striata ; 

 margo dorsalis utrinque valde declivis leviter convexiusculus, ventralis 

 parum arcuatus ; valvae intus tenuiter radiatim striatse ; impressio 

 pallii lata, baud maxime profunda. Lat. 21 mill., long. 121, crass. 8. 



Hab. Sow-and-Pigs Reef, Port Jackson. 



This species is almost equilateral, but a trifle longer anteriorly. 

 The surface of the valves is irregularly and rather distantly con- 

 centrically plicated, and also most minutely granosely striated in 

 the same direction. Down the posterior portion of the valves 

 from the umbo to the obtuse angle at the conjunction of the 

 lateral and ventral margins there radiates a slightly raised 

 elevation or keel ; and a second one is observed near the dorsal 

 slope. 



94. Cardita bimaculata, Deshayes, Proc. Zool. Soc. 1852, p. 102, 

 pi. xvii. f. 4, 5. 



Hab. Tasmania (Brazier) ; New Zealand (DesJiayes). 



The shells from Tasmania are white beneath the dirty brown 

 epidermis, and spotted irregularly with red upon the granose 

 ribs. Besides the two brown spots on the muscular scars in 

 each valve, there are two elongate marks of the same colour, one 

 on each side of the umbo, in the region of the lunule and dorsal 

 ligament. 



95. Cardium (Fragum) mundum. Reeve, Conchologia Iconica, ii. 



f. 125. 

 Hab. Arrowsmith Island, Marshall Group [Brazier); Lord Hood's 



Island {Cuming). 



The specimens of this beautiful species from Arrowsmith 



Island have a few sanguineous spots on the angles of the valves. 



and are also stained with the same colour between the lovely im- 



LINTf. JOUHN. — ZOOLOGY, VOL. XU. 40 



