153 
the tentacles connate at the base, with the eyes near their distal 
third ; the foot is dilated in front, forming an elevated shield, acutely 
auriculate on each side, pointed behind, and ending im a single long 
filament. Operculum small, horny, and unguiform. In three species 
of this genus in which I have observed the animal, namely Phos 
senticosus, roseatus, and Blainvillii, the hind part of the foot ter- 
minated in a single median filament, and not, as in Nassa, in a 
bifurcate tail. 
1. Pos senticosus, Linn. sp.; List. Pl. 967. fig. 22. 
Buccmum senticosum, Linn. 
Phos senticosus, Montfort. 
Hab. Philippine Islands ; H. C. 
2. Puos Buartnvituu, Desh. Chemn. pl. 125. f. 1201, 1202. 
Kiener, Mon. Buccinum, pl. 11. f. 38. 
Buccinum pyrostoma, Reeve. 
Hab. Philippine Islands; H. C. 
3. Paos Cumrnett, Reeve, Elements of Conchology, pl. 3. fig. 16. 
Hab. ? 
4. Puos crassus, Hinds, Zool. Voy. Sulphur, Moll. p. 37. pl. 10. 
£42 
Hab. Panama, Gulf of Fonseca. 
5. Puos vireatus, Hinds, /. ec. p. 37. pl. 10. fig. 11, 12. 
Hab, Ceylon. 
6. Puos rETEcosus, Hinds, /. ec. p. 37. pl. 10. fig. 3, 4. 
Hab. Ceylon. 
7. Puos. vERAGuENsIs, Hinds, /. c. p. 37. pl. 10. fig. 13, 14. 
Hab. Pueblo Nueva, west coast of Veragua. 
8. Puos articuLatus, Hinds, /.c. p. 38. pl. 10. fig. 7, 8. 
Hab. Panama. 
9. Pos roseatus, Hinds, /. ec. p. 38. pl. 10. fig. 9, 10. 
Hab. North coast of Sumatra. 
10. Paos GaupEns, Hinds, /. ¢. p. 38. pl. 10. fig. 5, 6. 
Hab. Gulf of Tehuantepec, west coast of Mexico. 
11. Paros cancetuatus, A. Adams. P. testd ovato-fusiformi, 
albidd, obsolete fusco fasciatd; anfractibus subrotundatis, 
lineis elevatis longitudinalibus et transversis, valde cancellatis, 
cancellis ad angulos acute nodosis; aperturd intus fuscatd, 
anticé tuberculatd, plicd validd. 
Hab. 2 
This species resembles P. veraguensis; but the areas between the 
cancelli are simple, whereas in P. veraguensis there is an intermediate, 
elevated line, crossing them, a circumstance not mentioned in the 
description of Mr. Hinds. 
