DONAX.— Plate I. 



Species 4. (Fig. a, b, Mus. Cuming.) 



DoNAX DELTOiDES. Don. testd trigono-ovatd, soUdius- 

 culd, compressd, radiatim. subtiUashiie striata, lavigatd, 

 politd, purjiurasceute-fuacd velfulvd, umbonibus tide)'- 

 diim violaceis, latere antico rotimdato, postico obtuse 

 truncato, area convexd. 



The deltoid Donax. Shell triangularly ovate, rather 

 solid, compressed, radiately very finely striated, 

 smooth, polished, purplish-brown, or fulvous, um- 

 boes sometimes violet, anterior side rounded, poste- 

 rior obtusely truncated, area convex. 



Lamabck, Anim. sans vert. (Deshayes'edit.) vol. vi. p. 241. 



Hab. Brisbane, East Coast of Nevr Holland ; Strange. 

 The B. epidermia of Lamarck is probably a variety of 



this species. 



Species 5. (Mus. Cuming.) 

 Donax serra. Bon. testd obloiiyo-cimeatd, solidiuscidd, 



conqjressd, lavigatd, sub leiile radiatim striata, prope 

 angtdum posticu7u sulcata ; palUde spadiced, admnbonea 

 violaceo-radiatd ; latere atdico siibaciiminato-rutmidato, 

 postico obtuse angulato, undato-corruyato, ad extremi- 

 tatetn. Mante. 



The saw Donax. Shell oblong wedge-shaped, rather 

 sobd, compressed, smooth, beneath the lens racbately 

 striated, near the posterior angle grooved ; light fawn, 

 violet-rayed at the umboes ; anterior side subacunii- 

 nately rounded, posterior obtusely angled, wave- 

 wrinkled, gaping at the extremity. 



Chemnitz, Conch. Cab. vol. vi. p. 257. pi. 25. f. 251, 

 252. 



Bouax riiujens, Lamarck. 

 Capsa ringeus, Deshayes. 



Hab. Cape of Good Hope. 



Distinguished by its ample oblong-compressed form and 

 conspicuous wave-wrinkled posterior area. 



