230 TESTACEOUS MOLLUSCA. 



C. Spondyloides. Menke Spec. N. Holland. Mol. Elliptic-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. 2 



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. Lamarckii. Ferus. — N. Ann. du Mus. 3 — E Elliptica fy E. 

 Trigonula. Lam. 1,2.— Ann du Mus. 10. t. 29., 30,31. — E. M. 

 2. p. 120.— Ostrea E. W. S. t. 2./. 6.— E. Elliptica. 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. Caillaudi. Fer. Mem. Soc. H. N. Paris. \.p. 359. — Nouv. 

 Ann. du Mus. 3.— -Call. Meroe. 2. p. 51. f. 1,2,3.— E. M. 2. p. 

 121.— E. Tubifera. 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. Plumbea. Ferussac. Mem. S. H. Nat. Paris. 1. p. 359. — 

 N. Ann. du Mus. 3. — E. Semilunata. Lam. 3. — Ann. du Mus. 

 10. t32.f. 1, 2. — Sow. G. — Reeve Sys. t. 95. — E. Transversa. 

 Lam. 4. — Ann du Mus. 10. t. 32. /. 3,4. — Mulleria. Sow. G. — 

 E. Carteroni. 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. Foliacea of Quoy (Ast.) the Exogyra of Con- 

 rad (J. Philad. 7.) aud the Mitrula of Menke's Synopsis 



