APPENDIX. 339 
species have been described by Reeve (Z. P. 1844), and figured in his 
‘Conchologia Iconica.’ 
Myodora brevis (p. 24, as Anatina b.), t. 10, f. 13... M. ovalis 
(p. 25, as Anatina o.), t. 9, f. 53... 4. Pandoriformis (p. 25, as Ana- 
tina P.), t. 10, f. 9... M. crassa (p. 25, as Anatina c.), t. 10, f. 6... 
M. striata (p. 50, as Pandora s.), t. 12, f. 12. 
There can be little doubt, likewise, that A. globulosa (p. 20) and 
A. globosa (p. 23) are generically distinct (Tueonta, Gray), from such 
typical Anatine as our three first species; A. pretenuis (p. 23) and 
A. Leana (p. 24) have been separated by some, as CocHLODESM#, 
but by others have been placed in Periploma. 
Anatina truncata, p. 20, t. 11, f. 24... A. elliptica, p. 23, t. 9, 
f. 46: ... A. papyracea, p. 28, t..10, f. 12... A; Leana, pr 24,. t..9, 
f. 33 ... A. elongata, p. 24, t. 10, f. 15. 
Periploma trapezoides (p. 20, as Anatina t.), t. 10, f. 32... P. ar- 
gentaria, p. 21, t. 10, f. lL... P. planiuscula, p. 21, t. 10, f. 33. 
Peripnoma optusa (t. 13, f. 50), Hanl. in List of Illustrations to 
Lamarck’s Shells (1842), t. 2, f.50. Very obtusely trapeziform, out- 
line totally devoid of angularities, very inequivalve, very fragile, dull 
yellowish white; very inequilateral, the sides rounded, edge of the 
longer posterior one obliquely and continuously united to the sub- 
arcuated ventral margin; anterior side very short, roughened by 
minute punctures, and very much narrowed by the sudden declivity 
of the dorsal edge; anterior slope with minute crowded concentric 
wrinkles, bounded posteriorly in the more convex valve by a slightly 
impressed radiating hollow. 14...1¢4. W. America. 
Thracia plicata, p. 21, t. 10, f. 37... T. phaseolina, p. 22, t. 10, 
f. 35 (as declivis) ... T. similis, p. 22, t. 9, f. 52... LT. Conradi, p. 22, 
t. 10, f. 34... 7. Corbuloides, p. 22, t. 9, f. 20... 7’. curta, p. 22, 
t. 10, f. 1 ... T’. rupicola (as Corbula, p. 47, t. 11, f. 32).* 
Lyonsia (as Osteodoma, a misprint) hyalina, p. 24, t 10, f. 10... 
L. coruscans, Scacchi (p. 25, as O. elongata), t. 18, f. 27... L. (p. 26, 
as O.) cuneata, t. 10, f. 14. 
LIutraria elongata, p. 27, t. 10, f. 26... L. Tellinoides, p. 27, t. 11, 
f. 33 ... L. Cottardi, p. 28, t. 9, f. 56. 
On Lurrarta (p. 26). Consult Reeve’s monograph in his ‘ Con- 
chologia Iconica,’ and see, too, Proc. Bost. iii. and Zeit. Mal. 1849, 
1851. Examine, also, Lavignon Petitiana and Lavalleana of D’Or- 
bigny’s Cuba Shells. Many of our species might with equal (or 

1 Anatina distorta, p. 28, must, likewise, be included in this 
genus, and, perchance, in this species. 
