THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY, 



No. 63. OCTOBER 1842. 



XIII. — Descriptions of new Shells. By Richard Brinsley 

 Hinds, Esq., Surgeon R.N. 

 [With a Plate.] 

 Psammobia decora. Testa oblonga,tenui,cinnamomeo-brunnea; striis 

 concentricis ; valva dextra planiuscula, sinistra ventricosa ; pallide 

 violacea radiata ; intus violacea. PI. VI. fig. 1. 

 Long. unc. 1*9, lat. unc. 2*8. 

 Hab. San Diego, California. 



This is a shell with a fine cinnamon-brown epidermis, and 

 four pale violet rays showing through. One of these tra- 

 verses nearly the centre of the valve, and the other three are 

 clustered towards the slope on its posterior margin. The right 

 valve is nearly plane, but the other is somewhat ventricose. 



1. Cyrenaobesa. Testa ovata, turgida, fiavo-virente, transversim stri- 

 ata ; natibus integris ; dentibus lateralibus serrulatis ; latere an- 

 tico convexo acuto ; intus pallide violacea. 



Long. unc. 1*9, lat. unc. 25. 



Hab. Rivers, Feejee Islands. 



The umbones of this shell are so perfect as to be nearly en- 

 tire, and only sufficiently erose to bear out one of the features 

 which forms a portion of the character of the genus. Towards 

 the slope the epidermis is thrown into several small angular 

 waves, and is everywhere of a fine yellowish green colour. 



2. Cyrena tenebrosa. Testa ovata, fusco-virente, transversim striata ; 

 natibus valde erosis, dentibus lateralibus serrulatis ; latere antico 

 rectiusculo ; intus violacea. 



Long. unc. T8, lat. unc. 2*4. 



Hab. Rivers, Feejee Islands. 



Both' these species are from the same locality, and were for 

 some time placed together in my collection, but a very slight 

 examination is sufficient to establish their distinctness. This 

 is a flatter shell, of a darker colour, with some disposition to 

 send an angle from the umbones, which again are much erose. 

 Within, on the broad extremity of the valves and towards the 

 hinge, it is of a deep violet colour. 



Ann. fy Mag. N. Hist. Vol. x. G 



