168 CONCHYLIA— l>Yr/f F/^.4. 38. 



Shell rhombic with granular decussations and an oblique longitu- 

 dinal rib, open at the margin. 



Tab. nost. 13, fig. 1. 



Area tetragona. Lamarck, Hist. vi. p. 37. 



Mus. nost. A single specimen, found on the islands called the 

 Calves, so dangerous ot" access, in the west of Ireland. 



Shell seven eighths of an inch long, and an inch broad, of 

 an oblique square figure, tumid at the beaks, from which proceed 

 a nearly central rib to the angular point of the opposite margin : 

 hinge not quite straight, in consequence of the marginal 

 slope : color whitish-brown, inside white with a purple blotch 

 at one end. 



reticulata. Arca testd oblongci, costis longitndinalibus barbatis striis 

 minntis decussatis, margine recto subclatiso. 

 Shell oblong, with longitudinal bearded ribs decussate by 



minute striae, the margin straight and nearly closed. 

 Area reticulata. Gmelin, Syst. p. 3311. 



Turton, Linn. Syst. iv. p. 254. 

 Dillwyn, Descript. Catal. p. 237. 

 Turton, Conch. Diet. p. 7. 

 Chemnitz, vii. p. 193, tab. 54, fig. 540. 

 Area barbata. Brown, Wern. Soc ii. p. 512, tab. 24, fig. 3. 



Lister, Conch, tab. 233, fig. 67. 

 Found in Lough Strangford, by Dr. Magee. 



Shell half an inch long, and something more than an inch broad, 

 rather fiat, oblong, rounded at one end and a little angular at 



