168 GO^GRYLl A— DITHYRA 38. 



Shell rhombic with granular decussations and an oblique longitudi- 

 nal rib, open at the margin. 



Tai. nos^. 13, fig. 1. 



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



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

 Calves, so dangerous of 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 near- 

 ly 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. Akca testd oMongd, costis longitudinalibus barbatis strils minutis cle- 

 cussatis, margine recto subclauso. 

 Shell oblong, with longitudinal bearded ribs decussate by minute 



striae, the margin straight and nearly closed. 

 Area reticulata. Gvielin, Syst. p. 3211. 



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

 Dilhvyn, Descrij)t. 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 



