( 36 ) 



DIVISION XVIII. SYPHONOSTOMATA. 



GENERA. 



A. With varices. (1) 



4. Murex. (2) Lam. 



Oval or oblong ; turbi- Varices in two opposite 

 nated, canal projecting rows, 

 and straight ; operculum 

 horny. 



a Murex, Montf. Canal long and slim ; varices spinous. PI. 10, fig. 3. 



b Brontes, Montf. Canal long and slim ; varices knotty. 



c Typhis, Montf. Canal moderate ; varices spinous, with projecting tubes 

 between, penetrating the shell. PI. 12, fig. 7. 



d Chicoraceae, Montf. Canal moderate or long, with folded leaves notched 

 or divided. PI. 10, fig. 5. 



e Aquila, Montf. Canal moderate or short; varices knotty; umbilicate. 



f Lotorium, Montf. Canal moderate or short; varices knotty ; not umbi- 

 licate. 



g Tritonium, Montf. Canal moderate or short; varices simple; spire ele- 

 vated ; mouth generally wrinkled transversely on both lips. PI. 10, fig. 4. 



h Trophones, Montf. Canal moderate or short; varices numerous, com- 

 pressed, almost membranous. 



c Canal moderate or short; varices few, very much 



compressed, projecting considerably. 



2. Ranella. Lam. 



Turbinated ; canal short ; Varices bordering both 

 surface armed with tuber- sides, 

 cles ; lips of the mouth 

 wrinkled. PI. 10, fig. 6. 



a. Apollo, Montf. Umbilicate. 



B. TVithout varices. 



Columellal>imple. Marine. 



V. Animal, p. 70. 



a. Fusus, Montf. Umbilicate. 



b. Lathires, Montf. Not umbilicate. PI. 10, fig. 7, 



(1) Varices are projecting callous pads with which the animal edges the mouth 

 or aperture of its shell, each time that it suspends the growth. \. PI. 10, fig. 2, 

 a. b. c. d. 6. 



(2) Foss. in the London Clay; Crag Marl; fVoolvuich Loam; Green Sand; at 

 Grignon, Courtagnon. The Murex tripteris, living in the Indian Seas, near Batavia, 

 is very common at Grignon. 



(3) Foss. in the London Clay. In France they are found in the newest Shelly Lime- 

 stone, and are much more abundant in that than in any other formation. Although 

 the fossil species are numerous, we meet with scarcely any which are perfectly 

 analogous to those now found in the recent state, These remarks also apply to 

 the Fasciolaria, 



Marine. 



V. Animal, p. 70. 



Marine. 



V. Animal, p. 70. 



3. Fusus. (3) Lam. 



Fusiform, peristoma en- 

 tire ; spire elevated. 



