166 TESTACEOUS MOLLUSCA. 
and obsoletely grooved down the middle ; white richly painted with 
transversely flowing patches of bright orange, which on the pos- 
terior half of the shell are edged with blackish brown. 2.— 
Philippines. 
P. TesseLutatus. Sow. Z. P. 1832.—fReeve. Ic. f. 29. 
Orbicular, triangularly attenuated towards the umbones, equilateral, 
solid, tumid, white tessellated and variegated with brownish or 
purplish lake; the radiating ribs depressed and rounded, smooth, 
equal in size to the interstices, about twenty-five in number: beaks 
inflexed ligamental area small. 3.—W. Colombia. 
P. Morum. Reeve. Z. P. 1843.—Reeve. Ic. f. 40. Some- 
what pecten-shaped, pale pink sparingly and irregularly painted 
with long ruddy spots: radiately ribbed, ribs smooth: umbones 
nearly central. 2.—Madagascar? Allied to the last. 
P. Ocuuatatus. Reeve. Z P. 1843.—Reeve. Ic. f. 38. 
Somewhat pecten-shaped, radiately ribbed, brown sparingly and 
irregularly ornamented with white spots or spaces bordered with 
dark brown: umbones central but rather oblique. 2.— West 
Indies. 
P. Novosus. Reeve. Z. P. 1843.—Reeve. Ic. f. 22. Sub- 
orbicular, longer than broad, yellow variegated with dusky brown 
or chesnut, radiately ribbed, ribs distant and knobbed, the knobs 
nearly obsolete posteriorly: imterior whitish, brown posteriorly. 
1..14.— Ceylon. 
P. Pauuium. Reeve. Z. P. 1843.— Reeve. Ic. f. 21. Ob- 
liquely ovate, subtriangular, the shell being much contracted to- 
wards the umbones: rich brownish yellow vividly painted with 
scattered square dark spots: radiately ribbed, ribs nearly obsolete 
towards the margin. 8..14.—Zanzibar. 
P. Brcotor. Reeve. Z P. 1843.—Reeve. Ic. f. 20.— 
Beechey. Zool. t. 42. f. 3. Suborbicular, imequilateral, broader 
than long, attenuated towards the umbones longitudinally grooved, 
grooves numerous and very narrow, whitish clouded with violet 
and irregularly painted with triangular rusty reddish spots. 2..1. 
— California. 
P. Srricgitatus. Sow. Z P. 1832.— Reeve. Ic. f. 31. 
Suborbicular, triangularly attenuated towards the umbones, ven- 
tricose, pinkish variegated and streaked with rust-colour; the 
radiating ribs rather distant and rounded, interstices smooth. 
1..1.—South America. 
P. Inzauaus. Son. Z. P. 1832.—(not Beechey. Zool.)— 
Reeve. Ic. f.16.—P. Pectinitrormis. W. S.¢. 2. f.11. Sub- 
cordate, oblique, inequilateral, longer than broad, gibbous, with 
obtuse radiating strize white or lilac-grey with four or five broad, 
rusty or blackish transverse bands, the striz disposed in rib-like 
clusters and their interstices striated. 13..13.—Panama. The 
