188 
Genus Pectuncu.uvs. 
Precruncvtus spurcus. Pect. testd subquadrato-ovali, gibbd, glauco- 
Suscd, longitudinaliter costatd, costis numerosis, angustis, subtilis- 
sime striatis ; umbonibus albicantibus, obliquis. 
Conch. Icon., Pectunculus, pl. 7. £. 36. 
Hab. Bay of San Carlos (found in coarse sand at the depth of six- 
teen fathoms) ; Cuming. 
The width of this little species from the umbones to the margin is 
comparatively shorter than that of any other species. 
PectuncuLus Prertusus. ect. testd orbiculari, alba, fusco unda- 
tim pictd ; radiatim costatd, costis subtilissime pertusis ; umbonibus 
centralibus. 
Conch. Icon., Pectunculus, pl. 7. f. 37. 
Hab. Islands of Mindanao and Luzon, Philippines (found in coarse 
sand at the depth of ten fathoms) ; Cuming, 
This interesting little species presents a marked peculiarity in the 
ribs being finely pricked on each side. Two or three specimens only 
were collected by Mr. Cuming at the above-mentioned islands. 
Prctruncutus ocuatus. Pect. testd sub-Pectiniformi, radiatim 
costatd, fusca, maculis albis, superné nigro-marginatis, sparsim 
et irregulariter ornatd ; umbonibus centralibus, subobliquis. 
Conch. Icon., Pectunculus, pl. 7. £. 38. 
Hab. West Indies. 
The ground-colour of this shell being a very dark chestnut-brown, 
the scattered white spots or spaces have a very prominent appear- 
ance. Since the specimen above described was figured, M. Deshayes 
has kindly lent me a specimen in which the white spaces are con- 
siderably larger and more characteristic; and I have also had the 
pleasure of examining a specimen of exceeding beauty, in the col- 
lection of M. Delessert, whose kindness in allowing me to have a 
drawing made of it was unfortunately too late to be of service. 
Pectruncutus canceLuatus. Pect. testd oblique Pectiniformi, striis 
subtilissime cancellatd ; albd, epidermide luted holosericd partim 
indutd ; umbonibus prominentibus, centralibus. 
Conch. Icon., Pectunculus, pl. 7. f. 39. 
Hab. Singapore (found in sandy mud at the depth of seven to ten 
fathoms) ; Cuming. 
This little shell is very thin and fragile, and perfectly white; the 
entire surface being delicately cancellated and covered towards the 
margin with a thick pale yellow epidermis. There is no possibility 
of confounding it with any other species. 
PrcruncuLus morum. Pect. testd sub-Pectiniformi, pallidé pur- 
pureo-rubrd, maculis rubidis elongatis sparsim et irregulariter 
pictd ; radiatim costatd, costis levibus ; umbonibus subcentralibus. 
Conch. Icon., Pectunculus, pl. 7. £. 40. 
Hab. Madagascar ? 
A very pretty species, in which the ribs radiate somewhat more 
