( 38 ) 



DIVISION XIX. ENTOMOSTOMATA 



GENERA. 



A . Turreied. 



1. Eburna. Lam. 



Shell smooth. PI. 10. 



2. Ancillaria. (1) Lam. 



Ajvcilla. 



Oblong, spire short. 

 PI. 10, fig. 10. 



Columella deeply and 

 broadly umbilicate. 



A callous pad on the 

 base of the columella. 



3. Mitra. (2) Lam. 



Turreted or sub-fu- Columella with large 



siform ; spire pointed , folds, the largest nearest 



mouth oblong. PI. 10, the spire. 



fig. 11. 



Columella with the 

 base twisted obliquely 

 in sharp, spiral folds. 



4. Pyramidella. Lam. 



Mouth broad, crescent 

 shaped. PI. 10, fig. 12. 



5. Terebra. (3) Brug. 



Spire at least double the Columella convex or 



greater diameter of the naked, the visible part 



mouth : no operculum, very short. 

 Pi. 10, fig 20. 



6. Cerithium. (4) Brug. 



Mouth oval, curved to A gaiter in the upper 

 the left at the notch : oper- part of the right lip. 

 Culum round and horny. 



a. With varices, but no fold on the columella. 



b. With folds on the columella. PI. 13, fig. 2. 



e. No folds on the columella; no varices. PI. 10, fig. 



Marine. 



V. Animal, p. 69. 



Marine, 



Marine. 

 Warm climates. 

 Y. Animal, p. 69. 



Marine. 



V. Animal, p. 63. 



Marine. 



V. Animal, p. 70. 



Marine. 



y. Animal, p. 70. 



19. 



(1) Foss. in the London Clay; at Grignun ; Courtagnon ; Environs of Paris. 



(2) Foss. at Grignon; Parnes near Magny. 



(3) Foss. at Grignon ; Parnes. 



(4) This genus of univalves presents more species in the fossil state than any 

 other. There are already upwards of a hundred in the cabinet of M. De France : 

 they are almost all found in the newest formations. M. de Gerville, however, re- 

 ports that he has found four species in the bed of Ammonites and Belemnites, in the 

 environs of Bayeux. — Journal de Physique, October, 1813. They have been found 

 in England, in the London Clay and in the Chalk Marl, The Cerithium Gigas, 

 pi. 13, fig. 2, is sometimes from fifteen to sixteen inches long, and four in diameter 

 at the last whorl. 



