MOLLUSCA. 37 



Phos. Montfort. 

 Phos, Montfort, 1810. Rhinodomus, Swainson, 1840. 



155. Phos crassus, Hinds, Ann. Nat. Hist. vol. xi. p. 257, (Plate X, fig. 1, 2.) Testa, elongate 

 ovata, subturrita, solida, pallide fusca. ; anfractibus rotundatis, costatis ; costis rudibus, subdistantibus, 

 lineis salientibus decussatis ; labro grandidentato ; columella antice valde producta. 



Inhab. Panama; Gulf of Fonseca ; dredged as solitary shells in from three 

 to fourteen fathoms, among mud. 



Solid and massive, with large coarse ribs crossed by prominent lines ; whorls 

 slightly contracted beneath the suture ; the margin of the outer lip toothed, inter- 

 nal ridges strongly marked ; columella with a lamina produced directly and boldly 

 forward. The colour is light brown, somewhat deeper on the ribs. 



156. Phos virgatus, (Plate X, fig. 11, 12.) Testa elongate ovata, laevigata, pallide fusca; 

 anfractibus rotundatis costatis, infra suturam subcoarctatis ; costis rotundatis, superne nodatis, 

 lineis impressis fuscis transversini instructis; labro subcrenulato; columella Iaevi, producta. 



Inhab. Ceylon. 



As in the preceding, the whorls are somewhat contracted beneath the suture, 

 and hence the ribs present at the upper part a nodulous appearance ; regularly 

 disposed excavated lines are arranged transversely. In some specimens the ribs 

 are occasionally disposed to become varicose. The outer lip is somewhat crenu- 

 late on the margin, and the inner is slightly produced. 



157. Phos retecosus, (Plate X, fig. 3, 4.) Testa, elongate ovata, ventricosa subturrita, pallida; 

 anfractibus rotundatis, concinne costatis; costis numerosis, circa quindecem ad peripheriam, lineis 

 transversis nod ulosis, pone labrum valde aggregatis; labro subcrenulato: columella varicosa, vix 

 callosa. 



Inhab. Ceylon. 



In this species the ribs are numerous, and nodulous at the crossings of the 

 transverse lines ; in the adult shell there is also a curious aggregation of them 

 behind the outer lip, and which is of a whiter colour than the other portions. The 

 columella supports several varices, and is clothed with a slightly produced callus. 

 Judging from the figures given by M. Deshayes, this species very closely 

 resembles his Buccinum Roissyi, if we except the peculiar character furnished by 

 the labrum, no signs of which I can discover in his figures, though it is constant 

 in all our specimens. 



158. Phos veraguensis, Hinds, Ann. Nat. Hist. vol. xi. p. 257, (Plate X, fig. 13, 14.). Testa 

 elongate ovata, cancellata, fusca. ; anfractibus subrotundatis, obsolete fasciatis, cancellis transversis, 

 ad angulos subnodosis; labro crenulato ; columella nuda vel vix callosa. 



