240 CATALOGUE OF PHANEROPNEUMONA. 
Operculum thin, shelly, white on both sides. Height 17, 
greatest breadth 20, least br. 17 mill. 
Helicina Tankervillii, Gray, in Zool. Journ. i. p. 250; Sow. 
Genera of Shells, n. 36, f.2; Reeve, Conch. Syst. ii. t. 186, f. 10; 
Sow. Thes. n. 19, p. 5, t. 1, f. 17. 
Trochus Tankervillii, Wood, £nd. Suppl. t. 5, £. 10. 
Trochatella Tankervillii, Pfr. in Z. f. WM. 1848, p. 82; Zc. n.1, p.4 
t. 5, f. 1, 2; Petit, in Journ. Conch. 1851, 1. p. 85, t. 1, f. 9 
Pfr. Pneum. Mon. p. 333. 
Hab. Jamaica. 
ef 
’ 
12. TROCHATELLA CONSTELLATA. 
Shell top-shaped, thin, sculptured above with lamellar oblique 
ribs, marbled with white and yellowish; spire elevated gradu- 
ally, with the apex mucronate; whorls 8, the upper ones form- 
ing a pointed apex, the following ones rather flat, furnished 
with a crenated keel, the last whorl receding below the pre- 
ceding, coarsely trellised beneath with radiating ribs and spiral 
ridges, impressed in the centre, not callous; keel of the two 
last whorls dilated, spreading lamellarly, striated radiatingly 
and crenulated very elegantly; aperture very oblique, nearly 
rhombiform ; peristome thin, with the margins parallel, upper 
margin straight, sinuous, basal margin reflexed. Operculum 
oblong, thin, white. Height 7, greatest breadth 13, least br. 
12 mill. 
Helicina constellata, Morelet, in Revue Zool. 1847, p. 144; Testac. 
Noviss. i. p. 21, n. 53; Poey, Memorias, i. t. 5, f. 15-17; i. p. 116. 
Helicina pagoda, Velasquez, MSS. 
Trochatella constellata, Pfr. Ic. n. 8, p. 8, t. 9, f. 40, 41; Pnewm. 
Mon. p. 334. 
Hab. Sierra de Cristalos, Isla de Pinos, near Cuba. 
13. TROCHATELLA STELLATA. 
Shell depressedly top-shaped, thin, sculptured above with la- 
mellar oblique ribs and several concentric ridges, opaque, 
yellow, spotted with white; spire convexly conoidal, raised into 
a slender pointed apex; whorls about 8, rather flattened, the 
first ones smooth, the following girdled with a prominent den- 
ticulated keel, last not descending, moderately convex on both 
sides, radiatingly (but not concentrically) ribbed beneath, im- 
pressed in the middle; aperture very oblique, lanceolate- 
rhomboid; peristome thin, with the upper margin straight, 
sinuate, basal margin shortly reflected. Height 7, greatest 
breadth 13, least br, 113 mill. 
Helicina stellata, Velasquez, MSS.; Jay, Catal. 1850, p. 262, 
n. 6098; Poey, Memorias, i. t. 5, f. 18-20; ii. p. 117. 
