OF MOLLUSCA. 



9 



d. Operculum and animal unknown. 



?7. Anna. 

 Shell fusiform ; mouth ovate ; outer lip rather thickened, crenate. 



" Operculum horny." — Philippi. Teeth ? 



1. A. Massena, Phil. Moll. Sicil. ii. 188. t. 27. f. 5. 



? 8. Melatoma. 



Shell fusiform ; mouth elongate, linear ; outer lip notched at the 

 suture ; canal short. Operculum 1 Teeth ? 



1. M. sulcata, Swains. 



? 9. CONOPLEURA. 



Shell obconic ; whorls compressed ; mouth linear. Operculum 

 ? Animal 1 



1. C. striata, Hinds. 



? 10. Daphnella. 



Shell fusiform, thin ; mouth elongate, oblong, slightly channeled 

 in front ; outer lip acute. Operculum ? 



1. D. marmorata. 



2. D. ornata, Adams, Gen. Moll. t. 10. f. 8, shell only. 



Suborder II. Proboscidifera, Gray. 



Head small, with an elongated retractile (long exsertile) pro- 

 boscis, when retracted hidden in the body. Tentacles close together 

 at the base or united by a veil over the base of the proboscis. Teeth 

 in 1, 3, or 7 series on the surface of a linear elongate horny mem- 

 brane. Gills in two series with some mucous filaments. Eyes ses- 

 sile, generally on the outer side near the base of the tentacles, but 

 sometimes at the tip or on the head behind their base. Carnivorous ; 

 eating living mollusca and other animals ; often boring round holes 

 in the shell to arrive at the living animal. 



I. Edriophthalma. Eyes on the outer side of the base of the ten- 

 tacles. 



A. Hamiglossa. Teeth in three series; central fixed, lateral 



versatile. 



B. Odontoglossa. Teeth in three series; central and lateral 



fixed, transverse. 



C. Rachiglossa. Teeth in a single longitudinal series. 



D. Tcenioglossa. Teeth in seven series; the central and inner 



lateral fixed, two outer lateral mobile. 



E. Ptenoglossa. Teeth in numerous longitudinal series. 



II. Iniophthalma. Eyes sessile, between and behind the tentacles. 



A. Ptenoglossa. Teeth in numerous series. 



B. Tcenioglossa. Teeth in seven series; the two outer lateral 



mobile. 



C. Gymnoglossa. Teeth none. 



