" GONCRYLl A— DITHYRA. 39. I73 



of this species. But the specimen he presented to us was of such 

 minuteness as to elude our powers of detection, without an examin- 

 ation of intermediate sizes. 



Pectunculus testa orbiculari subdepressd (equilaterali, maculis trans- undatus. 



versim undatis. 

 Shell orbicular rather flat and equilateral, with the colored marks 

 disposed in transverse undulate bands. 



Tab. nost. 12, fig. 3, 4. 

 Area undata. Linn. Syst. Nat. p. 1 142. 



Gmelin, Syst. p. 3312. 

 Turton, Linn. Syst. iv. p. 2-55. 

 Dillwyn, Descript. Catal. p. 241. 

 Chemnitz, vii. p. 224 tab. 57. fig. 560. 

 Mus. nost. British Channel and Guernsea. 



Shell an inch and a half in diameter, and diiFers only from the 

 last, in the colored marks being disposed in transverse undulate 

 bands of deep red or morone. 



Pectunculus testa orbiculari depressd decussatd, maculis nebulosis. decussatus. 

 Shell orbicular flat decussate, with clouded colored marks. 



Tab. nost. 12, fig. 5. 

 Area decussata. Linn. Syst. Nat. p. 1142. 



Gmelin. Syst. p. 3310. 



Turton, Linn. Syst. iv. p. 253. 



Dillwyn, Descript. Catal. p. 239. 



Chemnitz, vii. p. 226, tab. 57, fig. 561. 



