DONAX.— Plate VI. 



Gray, MS. in Brit. Mus. ; Hanley, Cat. Eeceiit Shells, 



p. 81. 

 Hub. West Coast of Africa. 



Of convexly elongated growth, obtusely angled at the 

 posterior end, where the area, unlike the rest of the shell, 

 is closely wrinkle-ridged. 



Species 38. (Mus. Cuming.) 



DoNAX GRACILIS. Bon. testd trigono-elongatd, ad mar- 

 ginem arcuatd et compressd, versus umbones gibhosd, 

 Itevigatd, epidermide sordide olivaced corned indiitd ; 

 latere antico rotmidato, subrostrato, postico declivi- 

 truncato, obtuse angulato. 



The slender Donax. Shell triangularly elongated, 

 arched and compressed at the margin, gibbous to- 

 wards the uniboes, smooth, covered with a dull oli- 

 vaceous horny epidermis ; anterior side rounded, 

 slightly beaked, posterior slantingly truncated, ob- 

 tusely angled. 



Hanley, MS. (Mus. Cuming.) 



Hab. Gulf of Guayaquil ; Cuming. 



A smooth species, having somewhat the appearance of 



a narrow elongated Capsa. 



Species 39. (Mus. Cuming.) 



Donax scalpellum. Bon. testd angjiste elongatd, rectd, 

 subcompressd, iitrinque paulidum hiante, IcBvigatd, po- 

 litd, a.lbidd, livido-purpurascente radiatd et pallide 

 tinctd, valde incequilatei-ali ; latere OMtico rotmidato, 

 postico declvoi-truncato ; ared snbconcavd, nitide con- 

 centrice liratd. 



The lancet Donax. Shell narrowly elongated, straight, 

 rather compressed, a little gaping at both ends, 

 smooth, poUshed ; whitish, rayed and faintly tinged 

 with livid purple, very inequilateral ; anterior side 

 rounded, posterior slantingly trancated, area rather 

 hoUow, neatly concentrically ridged. 



Gray, Annals of Philosophy; and Wood, Index Testaceo- 

 logicus, Supp. pi. 2. f. 1. 



Hab. Gulf of California. 



Of a peculiar straight Solen-Wke, growth, smooth and 



highly polished, except on the posterior area, which is 



neatly concentrically ridged. 



Species 40. (Mus Cuming.) 

 Donax Califoenica. Bon. testd oblongo-ovatd, snbcur- 

 vatd, griseo-albd, nlgricante-canleo fa-matd et lati- 

 radiatd, radiatim obsolete d^nse sulcatd, umbonibus 



violaceo eximii biradlatis ; subaquilaterali, lateribns 

 rotundatis, postico vix angulato. 



The Californian Donax. Shell oblong-ovate, some- 

 what curved, greyish-white, banded and broad-rayed 

 with blackish-blue, radiately obsoletely densely grooved , 

 umboes marked with two small violet rays ; nearly 

 equilateral, sides rounded, the posterior scarcely 

 angled. 



Conrad, Joura. Acad. Nat. Sci. Philadelphia, vol. vii. 

 pi. 19. f. 31. 



Hab. Gulf of California. 



This species, wanting the posterior truncated area so 

 characteristic of the genus, has more the form of a Tellina. 



Species 41. (Mus. Cuming.) 



Donax sella. Bon. testd oblongo-ovatd, subtrigond, pos- 

 tice gibbosd, lavigatd, nitente, obsolete dense sulcato- 

 radiatd, eburned, radiis angustis roseis ornatd; latere 

 antico roiundato, postico declivi-truncato, vix angulato. 



The neat Donax. Shell oblong-ovate, somewhat tri- 

 angular, gibbous posteriorly, smooth, shining, obso- 

 letely densely groove-rayed, ivory-white, ornamented 

 with narrow pink rays ; anterior side rounded, pos- 

 terior slantingly truncated, scarcely angled. 



Deshayes, Pro. Zool. Soc. March, 1854. 



Hab. Acapulco. 



A delicately painted species, rather swollen towards the 

 posterior side, and truncated obtusely. 



Species 42. (Mus. Cuming.) 



Donax polita. Bon. testd anguste oblongo-ovatd, com- 

 planatd, spadiceo-fuscescente undique tinctd, et pallide 

 lentiginosd et fasciatd, subcequilaterali ; lateribiis ro- 

 tundatis, postico sub umbones paululuni truncato. 



The polished Donax. Shell narrowly oblong-ovate, 

 smooth, everywhere stained with fawn-brown, and 

 faintly freckled and banded, nearly equilateral ; sides 

 rounded, posterior slightly truncated beneath the 

 umboes. 



PoLi, Test. Siciliae, pi. 21. f. 14, 15. 

 Psammobia polita, Da Costa. 

 Bonax complariatus, Montagu. 

 Capsa complanata, Sowerby. 

 Bonax longa, Philippi. 



Hab. Mediterranean and South Britain. 



This species partakes so much of the form and character 

 of Cytherea, as hardly to come into the present genus. It 

 has been refen'ed both to Capsa and Psammobia. 



