TRIBE NYMPHACEA. Livy 
P. Ferroensis.* Lam. 2.—Turt. B. p. 94. t. 8. f. l.— 
Tevtina F, Gimel. 3235.—W. t.4. f. 36.—D. p. 77.—T. Incar- 
naTa. Pennant. t.47. f. 31.—List. t. 394. f. 241.—T. AnNGuLaTa. 
Born. t. 2. f. 5. Oblong, with fine transverse wrinkles, decussated 
on the flattened anterior slope, which is sub-truncated at its ex- 
tremity, and defined by a slight elevation in both valves, dirty-white, 
with pink rays: beaks sub-central.  9,..14.— North Europe. 
P. Vespertina.* Lam. 3.—SouLen V. Gm. 3228.—W. t. 
3. f. 27.—Trvuina Depressa. Don. t. 41.—T. Ausipa. D. p. 
78.—Ch. f. 59, 60.—(young) Turt. B. t. 6. f. 10. Oblong, 
moderately thick, sub-equilateral, nearly smooth, anteriorly slightly 
angulated ; whitish or pale straw-coloured, rayed with pale reddish 
purple.—Variety, from Venice, more of a violet colour, with 
darker rays: violet within. (Born.t. 2.f.6, 7.) 14..24.—Medi- 
terranean and Atlantic.1 
P. Macutosa. Lam. 5.—. t. 228. f. 2.—Sav. Egypt. t. 8. 
Jf. 1. Oval-elliptic, with interrupted broad reddish livid rays, on 
a paler round, mottled by white spots: the oblique sub-imbri- 
cated transverse wrinkles almost become ridges at the angulated 
anterior extremity: inside tinged with hilac, the teeth strong, and 
the nymphe violet.— Tiger Bay, Africa. 
P. Ceruvescens. Sow. Gf. 3. —Reeve. t. 53. f. 3.—TEL- 
Lina Gari? Lin. Gmel. 3229.—An. SoLen Ametuystus. D. p. 
68.—W. t.3.f.36. Oblong, hinge nearer to the posterior rounded 
than the anterior angulated extremity ; reddish violet, with transverse 
concentric wrinkles, which are smoother at one end than at the 
other, and minute vertical lines seemingly under the outer surface : 
nymphe prominent. 11..23.—H. Indies.—Variety, with indis- 
tinct rays, and reddish violet within.—The fold is regular, and 
not like a Tellina. 
P. Exoneata. Lam. 7.—Del. t. 5. f. 4.—An. Sav. Egypt. 
t. 8. f.2.? Elongated ovate, ventral margin not much rounded, 
pale with light violet rays and bands; beaks fulvous and tumid ; 
inside with a bluish anterior ray. 3.— Red Sea. 
_P. Fravicans. Lam. 8.— Del. t. 5. f. 5. Elliptic, not at- all 
angular, yellowish-flesh-colour, finely striated transversely.— 
Variety. Saneuinouarta Livipa. (Lam.—W. 8S. t. 1. f. 3.) 
Semi-orbicular, thin, smooth, pale violet, with three white rays 
on the posterior side. 24.—New Holland. 
-P. AtBa. Lam. 10. Oval, white, with indistinct rays, thin, 
minutely and transversely striated. ‘‘ Closely resembling the last, 
of which perhaps it is only a strong variety.” —~(Drsu.) 
P. Sauamosa. Lam. 9.—Del. t. 5. f. 6. Elongated, oblong, 

1 Pp, Vireata, Lam. 1. and Fuorrpa, Lam. 4. belong to this 
species. (Deshayes). 
