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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 in 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. Phos senticosus, Linn, sp.; List. PI. 967. fig. 22. 
Buccinum senticosum, Linn. 
Phos senticosus, Montfort. 
Hah. Philippine Islands ; H. C. 
2. Phos Blainvillii, Desh. Chemn. pi. 125. f. 1201, 1202. 
Kiener, Mon. Buccinum, pi. 11 . f. 38. 
Buccinum pyrostoma, Reeve. 
Hah. Philippine Islands ; H. C. 
3. Phos Cumingii, Reeve, Elements of Conchology, pi. 3. fig. 16. 
Hah. -? 
4. Phos crassus. Hinds, Zool. Yoy. Sulphur, Moll. p. 37. pi. 10. 
f. 1, 2. 
Hah. Panama, Gulf of Fonseca. 
5. Phos virgatus, Hinds, l. c. p. 37. pi. 10. fig. 11, 12. 
Hah. Ceylon. 
6. Phos retecosus, Hinds, l. c. p. 37. pi. 10. fig. 3, 4. 
Hah. Ceylon. 
7. Phos veraguensis. Hinds, l. c. p. 37. pi. 10. fig. 13, 14. 
Hah. Pueblo Nueva, west coast of Yeragua. 
8. Phos articulates. Hinds, l. c. p. 38. pi. 10. fig. 7, 8. 
Hah. Panama. 
9. Phos roseatus. Hinds, l. c. p. 38. pi. 10. fig. 9, 10. 
Hah. North coast of Sumatra. 
10. Phos gaudens, Hinds, l. c. p. 38. pi. 10. fig. 5, 6. 
Hah. Gulf of Tehuantepec, west coast of Mexico. 
11. Phos cancellatus, A. Adams. P. testa ovato-fusiformi , 
alhida, obsolete fusco fasciatd ; anfractihus suhrotundatis, 
lineis elevatis longitudinalihus et transversis, valde cancellatis, 
cancellis ad angulos acute nodosis; apertura intus fuscatd, 
antice tuherculatd , plied validd. 
Hah. -? 
This species resembles P. veraguensis ; hut 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. 
