262 TEREBELLINiE. 



and muzzle, and is from Borneo ; the other species are 

 also from the Indian Archipelago, with the exception of 

 G. magnus, which is from the Red Sea. 



Species of Gladius. 



curtus, Sow. magnus, Chem. 



Favanni, Pfeiff. melanocheilus, A. Adams. 



fusus, Linn. Powisii, Velit. 



Sub-gen. rimella, Agassiz. 



Whorls cancellated ; beak short. 



cancellatus, Lam. crispatus, Sow. 



Sub-fam. TEREBELLIN^. 



Tentacles none ; eyes on the ends of long cylindrical 

 peduncles. Foot with the hind part compressed and 

 ovate, anterior part small and rudimentary. Operculum 

 narrow and claw-like. Shell subulate, with the outer lip 

 simple. 



In this sub-family the rostrum is produced, annulated, 

 and deeply grooved beneath ; the mantle-margin is entire, 

 dilated anteriorly and folded into a rudimentary siphon 

 in front ; posteriorly it is prolonged into a slender fila- 

 ment, which extends into the channelled suture of the 

 spire ; the foot is compressed and ovate, with a small, 

 horizontal lobe in front ; the operculum is inserted in the 

 hind edge of the compressed foot, and is small, narrow, 

 and three-clawed externally, and furnished internally 

 with a free, fin-like, membranous lobe. 



