370 TESTACEOUS MOLLUSCA. 



variegated and spotted with reddish brown ; inside white, deeply 

 stained on one side with brown. \\. Panama. 



Pectunculus roseus (t. 19, f. 29), Reeve, I. Pert. f. 19. Sub- 

 orbicular, scarcely if at all oblique, equilateral, subventricose, mottled 

 with white and rose-colour ; the colouring 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. 1£. N. Zealand. Seems the young of Quoy's P. lati- 

 costatus. 



Pectunculus laticostatus (t. 19, f. 30), Reeve fas of QuoyJ, 

 I. Pec. f. 8. — P. ovatus, Quoy, Ast. t. 77, /. I, 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. 3. N. Zealand. 



On Nucula (p. 167). Additional species may be sought in the 

 Z. P. 1844, Moller's Moll. GrcenL, Loven's Moll. Scand., Proc. 

 Bost. 2, Proc. Philad. 3, Zeit. Mai. 1851, Dekay's Zoology of N. 

 York, Gray's Appendix to the 'Fly,' D'Orbigny's Cuba Shells, 

 D'Orb. S. Am., Forbes's ^Egean Shells (Report Brit. Assoc. 1843), 

 and in the ' Voyage de la Venus.' 



Nucula lanceolata, p. 167, t. 19, f. 49 ... N. elongata, p. 167, 

 t. 19, f. 50 ... P. Patagonica, p. 167, t.-tt, f. 14 ... N. crenifera, %jC\ 

 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, 1. 19, f. 55 ... N. Elenensis, p. 169, 1. 19, f. 56 ... N. eburnea, 

 p. 169, t. 19, f. 57 ... N. cnneata, p. 169, t. 19, f. 58 ... N. Thraca- 

 formis, p. 169, t. 20, f. 15 ... N. Eightsii, p. 169, t. 20, f . -to ... .;" 

 N. Eightsii, p. 169, t. 20, f . 2 ... N. sapotilla, p. 170, t. 20, f. 3 ... 

 N. nasuta, p. 170, t. 19, f. 59 ... N.fabula, p. 170, t. 20, f. 6 ... 

 N. striata, p. 170, t. 19, f. 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. 13 ... N. proximo,, p. 172, t. 20, f. 5. 



Nucula tenella (t. 19, f. 47), Hinds, Z. 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 



