376 TESTACEOUS MOLLUSCA. 
variegated and spotted with reddish brown; inside white, deeply 
stained on one side with brown. 14. Panama. 
PrectuncuLus RosEvs (t. 19, f. 29), Reeve, I. Pect. f.19. Sub- 
orbicular, scarcely if at all oblique, equilateral, subventricose, mottled 
with white and rose-colour; the colourmg matter almost confined to 
the ribs, which radiate over the entire surface, are very numerous 
(40 at least), convex, little raised, with their intervals very narrow and 
most closely decussated by very fine raised concentric wrinkles ; 
ligamental margin moderately long; umbones not very prominent ; 
beaks in the centre of the ligament, not inclined; inside white; 
teeth few. 14. N. Zealand. Seems the young of Quoy’s P. lati- 
costatus. 
PrcTruUNCULUS LATICOSTATUS (t. 19, f. 30), Reeve (as of Quoy), 
I. Pec. f. 8.—P. ovatus, Quoy, Ast. t. 77, f. 1, 2, 3. Orbicular, or 
rounded-ovate, ventricose, equilateral, thick, pale flesh-colour, irregu- 
larly painted with dark reddish spots upon the radiating ribs, which 
are rather broad and diffused over the entire surface: inside whitish ; 
teeth few. 38. N. Zealand. 
On Nucuta (p. 167). Additional species may be sought in the 
Z. P. 1844, Moller’s Moll. Greenl., Loven’s Moll. Scand., Proc. 
Bost. 2, Proc. Philad. 3, Zeit. Mal. 1851, Dekay’s Zoology of N. 
York, Gray’s Appendix to the ‘Fly,’ D’Orbigny’s Cuba Shells, 
D’Orb. 8. Am., Forbes’s Avgean Shells (Report Brit. Assoc. 1843), 
and in the ‘ Voyage de la Venus.’ 
Nucula lanceolata, p. 167, t. 19, f. 49 ... N. elongata, p. 167, 
tHlOy £:15 0) 22. 0Pa Patagoniea, cp. 167, +. V9, £3 V4 eo. ereniera, 
p. 167, t. 19, f.51 ... N. Arctica, p. 168, t. 20, f. 7 ... N. rostrata, 
p- 168, t. 20, f. 1 ... N. parva, p. 169, t. 19, f. 52 ... N. polita, 
p- 169, t.19, f£. 53... N. costellata, p. 169, t. 19, f. 54 ... N. gibbosa, 
p- 169, t. 19, f. es ... VN. Elenensis, p. 169, t.19, f. 56 ... N. eburnea, 
p 169, t. 19, f. 57 ... N. cuneata, p. 169, t. 19, f. 58 ... N. Thrace- 
formis, p. 169, t. 20, f L5i22. IN Maghist, sp: 169)1+.°20;. fly: 
N. Eightsii, p. 169, t. 20, f. 2... N. sapotilla, p. 170, t. 20, f. 3... 
Ne nasuta, pi170, t. 1931859 3 Nofabulay pili0, taQ0;eeiGae. 
N. striata, p. 170, t. 19, e 60... N. Mauritiana, p. 170, t. 19, f 46 
... N. limatula, p. 170, t. 20, f. 4... N. Myalis, p. 170, t. 19, f. 45... 
N. decussata, p. 171, t. 20, f.8 ... N. rugulosa, p. 171, t. 20, f. 10... 
N. nitida, p. 171, t. 19, f. 44... N. obliqua, p. 171, t. 20, f.9 ... 
N. convexa, p. 172, t. 20, f. 11... N. pisum, p. 172, t. 20, f. 12... 
N. exigua, p. 172, t. 20, f. 138... N. proaima, p. 172, t. 20, f. 5 
NvcuLA TENELLA (t. 19, f. 47), Hinds, 7. P. 1843, p. 99. Oval- 
oblong, subequilateral, rounded on one side, bluntly and abruptly 
peaked near the dorsal edge in the other (which, if either, is the 
more produced), compressed, thin, white under a shining yellowish 
