OF MOLLUSCA. 



193 



4. P. granulosa, t. 60*. f. 4. 



5. P. Catena, Forbes fy Hartley, B.M. t. V.V. f. 4. 



6. P. punctata, Forbes fy Hanley, B.M. t. V.V. f. 5. 



7. P. scabra, Forbes fy Hanley, B.M. 



t.V.V. f. 1. Fig. 105. 



m, . V/mr ,. \ Animal of Philine aperta. 



Ihe young animal {Philine aperta) 



is covered with a spiral shell furnished 



with vibratile swimming veils and an 



operculum. The eggs are numerous, 



in a very long spiral series, contained 



in an ovate hydrophanous gelatinous 



egg-capsule (fig. 105). — Loven. 



Lingual membrane of Philine aperta 



very narrow, very thin, transparent. 



Teeth two on each cross series, close 



together at the base, elongated, arched, nearly in half a circle, brown 



compressed, scimitar-shaped ; inner edge very finely denticulated 



teeth transparent (fig. 106). 



,?. Shell, o. Mouth, c. Head. 

 I. Side lobes, m. Mantle, g. 

 Gizzard seen through the skin. 



Fig. 106. — Teeth of Philine aperta. 



Fig. 107. — Teeth of Philine scabra. 



Lateral teeth of Philine scabra two, erect, claw-like, the inner 

 by far the larger, lobed within, serrulated ; outer minute, unarmed 

 (fig. 107). — Loven. 



5. HlRTJNDELLA. 



Head-lobe oblong, elongate. Eyes none. Mantle oblong, narrow, 

 produced into two elongated tails behind. Foot large, dilated on the 

 sides, reflexed, and embracing the head and mantle. Shell concealed, 

 flat, thin, scarcely involute. 



1. H. hirundinaria, t. 60. f. 1. 



*** Shell distinct, exposed. 



6. Cryptophthalmus. 



Head small, narrowed behind. Eyes under the free edge of the 

 disk. Mantle covering the base of the shell. Foot large, elongate ; 

 sides reflexed, sub cylindrical, covering the mantle, and with a pos- 

 terior branchial aperture. Teeth ? Shell partly exposed, horny, 



fragile, scarcely involute. 



1. C. smaragdina, t. 60. f. 3, 4, 5, 6. Var. Biippell, t. 60*. f. 9. 



This may be allied to Bulla. 



o 



