APPENDIX. 343 
On AmpuipEsMA (p.41) Reeve has published a monograph of 
Amphidesma proper, in his ‘ Conchologia Iconica.’ Lamarck (whom 
we followed in youthful confidence) has evidently, under this appella- 
tion, confused together several well-defined groups. The A. Boysii, 
tenue and prismaticum have very properly been separated as Syn- 
posMy#; A. albelluwm, according to Recluz, is identical with Lutraria 
Cottardi (p. 28 = A. Siculum, Sow.); the type of A. physoides (p. 43) 
was a Kellia (I saw it in the French Museum in 1843), but, according 
to Recluz, it is now destroyed; of A. nucleola a Kellia of the section 
Poronia (teste Recluz an Australian! species), of A. purpurascens, 
according to the same author, who has confirmed several of our con- 
jectures, Ervilia nitens. 
KELLIA, Turton. 
‘Somewhat globular, equivalve, closed. Hinge with two approxi- 
mate teeth and a remote lateral tooth in one valve, and a concave 
tooth and remote lateral one in the other. Ligament internal” 
(Turton). 
K. Geoffroyi (as Erycina G. p. 40, t. 12, f. 1)... K. rubra, p. 43, 
t. 9, f. 48. Our Mesodesma Cycladea, p. 38, is also a member of 
this genus, 
E ERVILIA, Turton. 
“ Oval, equivalve, inequilateral, closed. Hinge with a single erect 
tooth closing between two small divergent ones in the opposite valve ; 
lateral teeth none. Ligament none.” 
E. nitens, p. 48, t. 9, f.6. The Donaz castanea of the earlier 
British writers (Turt. Dith. t. 10, f. 18, as Capsa c.) is, also, a 
member of this genus. 
Cuminaia coarcrarta (t. 12, f. 37), Sow. Z. P. 1833, p. 34: G.— 
Reeve, C. 8S. t. 49, f.4. Resembling C. Tellinoides, but not so cunei- 
form in front, with the laminar wrinkles further apart and usually 
more elevated, and their intervals with scarcely perceptible radiating 
striule. 34. Mewico. Seems a variety of C. lamellosa. 
Cumineia TELLINOIDES (t. 12, f. 38).— Macrra T. Conr. J. 
Philad. 6, p. 258; Am. Mar. C. t. 14, f.2.—C. T. Gould, Mas. 
p. 50, f. 36. Oval-cuneiform, equilateral or nearly so, fragile, com- 
ressed and wedge-shaped in front, semi-oval and decidedly convex 
behind, dull uniform white, with close concentric laminar wrinkles, 
whose intervals are unsculptured; ventral edge incurved in front, 
subarcuated behind ; dorsal areas impressed. =5...42,. N. America. 
