230 TESTACEOUS MOLLUSCA. 
C. Sponpytomwes. Menke Spec. N. Holland. Mol. Elliptie-lan- 
ceolate, longitudinal, whitish with scarlet rays, and oblique elegant 
riblike folds ; lesser valve slightly convex, armed with elongated 
dilated vaulted scales; the larger one boat-shaped, externally 
with an angular carination, rough on one side and on the other 
muricated with various scattered scales ; beak turning to the right ; 
inner margin crenulated. N.W. Coast of Australia. ? 
ETHERIA 
Shell irregular, inequivalve, adhering ; beaks short, and appearing as 
if sunk in the top of the valves; hinge destitute of teeth, waved, 
somewhat sinuated, and unequal ; with two remote oblong muscular 
impressions ; ligament external, tortuous, penetrating partly into 
the shell. 
E. Lamarcxi. Ferus.—N. Ann. du Mus. 3—E. Exvxietica & E. 
Triconuta. Lam. 1,2.—Ann du Mus. 10. t. 29., 30,31.—E. M. 
2. p. 120.—Ostrea E. W. S. t. 2. f. 6.—E. Exurprica. Bl. t. 70, 
bis. f. 2. Very large, variable in shape, slightly flattened, and ge- 
nerally elongated longitudinally ; texture thick and foliaceous, nacre 
white and very brilliant internally ; muscular scars of the same hue 
as the rest of the interior; the beak not greatly produced. 
E. Cattraupi. Fer. Mem. Soc. H. N. Paris. 1. p. 859.—Nouv. 
Ann, du Mus. 3.—Cail. Meroe. 2. p. 51. f. 1,2,3.—E. M. 2. p. 
121.—E. Tusrrera. Sow. Z. J. 1. p. 523. t. 19. Moderately 
large, extremely variable in shape, thin, fragile, finely and irregu- 
larly foliaceous, sometimes armed with tubular points ; cuticle thin 
and green ; internal nacre scarcely irridescent, often greenish espe- 
cially towards the centre, and white near the margin; covered with 
inflated callosities when aged ; beak of the adherent valve often very 
large ; muscular scars slightly concave, of the same colour as the 
nacre. Egypt. 
E. Pirumsea. Ferussac. Mem. 8S. H. Nat. Paris. 1. p. 359.— 
N. Ann. du Mus. 3.—E. Semitunata. Lam. 3.—Ann. du Mus. 
10. € 32. f. 1, 2.—Sow. G.—Reeve Sys. t. 95.—E. TRAnsversA. 
Lam. 4.—Ann du Mus. 10. t. 32. f. 3,4.—Mutteria. Sow. G.— 
E. Carteront. Michelin. Mag. de Zool. t. 1. Usually somewhat 
smaller than the last, and equally as variable in shape, but more 
solid and irregularly foliaceous; often armed with tubular points 

wretched specimens, which effectually prevented the possibility of 
any certain recognition of the species, it is thought preferable to 
insert the whole of the species enumerated in Mr. B’s paper. 
2 See too the C. Foxtacea of Quoy (Ast.) the Exocyra of Con- 
rad (J. Philad. 7.) aud the Mrrruta of Menke’s Synopsis 
