PHILIPPIA. 243 



Operculum, T. variegata, Lamarck, fig. 7, a, 7, b, 7, c. 

 Shell, T. cylindracea, Chemnitz, fig. 7, d. 



This genus is known from Archiiectonica by its ele- 

 vated, spiral operculum, and by the last whorl of the 

 shell being rounded at the periphery; the operculigerous 

 lobe on the foot of the animal is cup-shaped when the 

 operculum is removed, and the edges are elevated. The 

 species affect deep water, and are very shy and sensitive 

 when observed. 



Species of Torinia. 



yEgena, Gould. fenestrata, Hinds. 



aetbiops, Mke. fulva, Hinds. 



areolata, Lam. infundibuliformis, Chem. 



bicariuata, WOrb. nubila, Mke. 



cselata, Hinds. strarninea, Chem. 



cyclostoma, Mke. trochoides, Desk. 



cylindracea, Chem. variegata, Lam. 



dealbata, Hinds. virgata, Hinds. 



Genus PHILIPPIA, Gray. 



Operculum flat, orbicular, many-whorled. 



Shell discoidal, subconic, smooth ; aperture subqua- 

 drate, not pearly within ; umbilicus wide, the margin cre- 

 nulated. 



Ea^. P. lutea, Lamarck, pi. 25, fig. 8. Operculum, 

 P. lutea, fig. 8, a, 8, b. 



This genus is founded upon the Solarium luteiim of 

 Lamarck, the animal of which is stated by M. Philippi 

 to resemble that of Trochus ; the operculum somewhat 

 resembles that of the Trochidce, but until the peculiari- 



