TRIBE NYMPHACEA. te 
smooth and rather small, orange yellow, pellucid, gaping at the 
margin: hinge callous, palleal scar simple. 3.—Mauritius.* 
P. Viouacea. Desh. in E. vol. 3. p. 852.—SouLen V. Lam. 
20.—Deles. t. 2. f. 5. Oblong, with the extremities rounded, an- 
teriorly narrower, both within and without violet with paler rays ; 
nymphe prominent : hinge with an obsolete tooth in one valve, in 
the other a perfect and imperfect one. 3.—Indian Ocean, 
P. Costata. Nobis. in Z. P. 1842. Sub-elliptical, anteriorly 
rather longer and angulated ; posteriorly narrowed and rounded at 
the extremity : dull, whitish, with livid rosy narrow rays, and most 
irregular crowded coarse transverse ribs, which often so unite on 
the anterior slope that one is formed from two: inside eae Lg 
plish or yellowish, the rays distinct, the nymphe purple. 1..13.— 
Australia.— Had not M. Deshayes assured us that the Virgata 
of Lamarck was merely a Ferroensis, we should have considered this 
shell to have been that species. 
P. Costuuata.* Turt. Biv. t. 6.f. 8.—P. Discors. Phil. p. 23. 
t. 3. f. 8. Oblong, posteriorly rounded and rather longer, an- 
teriorly obtusely angulated, very thin, anterior slope only with radi- 
ating grooves, elsewhere nearly smooth, white with interrupted 
sub-radiating scarlet marks, and a short scarlet sy streak 
proceeding posteriorly a little distance from the beaks. 4..1.— 
Sicily, §c. ; 
P, Linrouata. Grayin Yates Nen Zeal. Oblong, transverse, 
compressed, obliquely truncated, anteriorly purplish rosy, with 
rather ae concentric belts of very thin anastomosing radiating 
lines. 3..1.—New Zealand. 
P. VartEGATA.—Soien V. Wood. G.C.t. 34. f. 2. 3,4.—D. 
p. 68.—W. t. 3. f. 32. Ovate-oblong, anteriorly rather longer, 
sub-truncated, gaping; thin, pellucid, rosy orange, with purple 
rays, which are stronger anteriorly, nearly smooth: hinge with two 
teeth in one valve, one in the other. 3..1. 
P. Casrrensis.—Soien. C. Chem. f. 1935, 6.—D. p. 66.—W. 
t. 3. f. 25. Oval, rather longer and more obtuse anteriorly, very 

2 This species belongs to the genus Galeomna, T'urton, whose 
characters are as follows :— 
GALEOMNA. 
Transverse, equilateral, equivalve, ventral margin widely gaping : 
gape oval-oblong ; hinge toothless, callous, with a small pit for 
a sub-internal ligament under the beaks ; two very small and 
very distant muscular impressions : palleal scar simple. 
G. Turront.* Zool. Jour. vol. 2. t.13. f. 1.—Sow. G. fi 1 
2, 3.— Reeve. t. 54. f. 1, 2, 3. Ovate-oblong, transverse, une 
with very fine longitudinal ‘waved strie ; hinge thickened, palleal 
scar simple and wrinkled. 
