DONAX.— Plate II. 



A dull obese shell, densely grained about the posterior 

 area. 



Species 11. (Mus. Cuming.) 



DoNAX CAKINATA. Don. testd elongaio-cimeifm-mi, gib- 

 bosd, aniice acuminata, postice concavo-truncatd, late- 

 ribus ab tmibonihus subceniralibm dedivibus ; fumeo- 

 castaned, ad mnhones violaced; lavigatd, politd, ver- 

 sus niarginem deme Uiieari-snlcatd. 



The keeled Donax. Shell elongately wedge-shaped, 

 gibbous, anteriorly acuminated, posteriorly concavely 

 truncated, sides slanting from the umboes, which 

 are nearly central ; smoky-chestnut, violet at the um- 

 boes ; smooth, polished, towards the margin densely 

 linearly grooved. 



Hanley, Pro. Zool. Soc. 1843, p. 5. 



Hab. San Bias, California. 



Distinguished by its equislanting elongately wedge- 

 shaped form, and polished chestimt colouring. 



Species 12. (Mus. Cuming.) 



Donax asper. Bon. testd trigono-cuneatd, medio lata ef 

 gibbosuld, ad nmbones rostratd et elevato-contradd, 

 dtierascettte-albd, subopacd, radiatim dense Uratd, ad 

 latus posticum et ad aream dense corrngato-orenatd, 

 latere antico subacmninato-rotmidato, postico late con- 

 cavo-truncato. 



The eough Donax. Shell triangularly wedge-shaped, 

 broad and rather gibbous in the middle, beaked, ele- 

 vately contracted at the umboes, ash-white, rather 

 opake, radiately densely grooved, at the posterior 

 side and area densely corrugately crenated, anterior 

 side rather acuminately rounded, posterior broadly 

 concavely truncated. 



Hanley, MS. (Mus. Cuming.) 



Eab. Tumbez, Peru ; Cuming. 



A very characteristic species, elevately beaked as it were 

 about the umboes, and very concavely truncated on the 

 posterior side, whilst the whole of the posterior half of 

 the shell is denselv wrinkle-crenated. 



