S T W /E A. 



I'LATK XXXI, 



(Fig. 2, c, ,1, Mus. JJ;i 

 Ostrcea cucullina, Deshayes. A 



ay.) 



this interesting little species was found on the now 

 island that has within the last few years appeared olF 

 the Mauritius, Barclay Island. .See Plate 11.,/. 2, a, b, 

 copied from Deshayes, lie de la Reunion. 



Species 80. (Fig. </, h, r, Mus. Barclay.) 

 OsTi;.«A viTRKF,\CT.\. O.-it. tcstd .s'((//(/(/, siibcomprcssd, 

 siilireni/iiniii nl siibm-l>iriiliin ; valvA injen'on 

 siij)irioiriu superanii, <id lapiiks late adhceroiti ; 

 valrd siipciurrij'ulvd, piirpnreo strii/atd, iiitidissimd ; 

 mnnjiiH' intcrno valvce in/en'oris indenUi, superioris 

 deiiticulato, cicatrice utrdgiic ralvd snbccntrali, 

 mcujnd, purpurea strigatA. 



'J'liK vrn:irii:i) 0.stk/E.\. Shell solid, subcomprossed, 

 rather roniforin, or suborbicular ; lower valve 

 exceeding the upper, widely adhering to stones ; 

 upper valve fulvous, striped with purple, very 

 shining, inner edge of the lower valve indented, 

 of the upper denticulated, cicatrix in each valve 

 subcentral, large, striped with purple. 



SowEnBY. 



Hah. Riviere de la rempart, Mauritiu.s. 



The species is commonly eaten in its locality. 1 have 



named it from the peculiar glassy appearance of the 



upper valve. The two specimens are in Sir David 



Barclay' s collection. 



Nc 



iber, 1871. 



