DIVISION XVI. CRICOSTOMATA. 
4. Turso. (1) Lam. 
Round or oyal ; thick. 
GENERA. 
Mouth completed by 
the penultimate whorl. 
a. Meleager, Montf. Umbilicate. Pl. 9, fig. 3. 
6. Turbo, Montf. Not umbilicate, Pl. 12, fig. 15. 
2. Turriveia. (2) Lam. 
Spire elongated like an 
obelisk ; thin : operculum 
horny or cartilaginous. PI. 
J; fig. 42. Pl. 12;fig. 17: 
3. Vermicutaria. dAdan- 
Son. 
Whor!s not touching, 
irregularly curyed. Pl. 9, 
fig. 17. 
4. Drteninuta. (3) Lam. 
Thick ; rolled almost in 
ne same plane. Pl. 9. fig. 
5- Scararra (4) /am. 
Turreted, with pro- 
jecting sharp longitudinal 
ribs. Pl. 9, fig. 6. 
6. Actona. (5) Leach. 
WENDLETRAP. 
Ditto, but whorls dis- 
Mouth completed by 
the penultimate whorl. 
Ditto. 
Mouth entirely formed 
by the last whorl. 
Ditto ; but margined. 
Mouth entire and mar- 
tinct and distant; no co- gined. 
lumella. Pl. 9, fig. 5, 
(1) Foss. in the Crag Marl; at Presles; Grignon. 
Marine. 
V. Animal, p. 65. 
Marine. 
V. Animal, p. 65. 
Marine. 
V. Animal, p. 65. 
Marine. 
V. Animal, p. 65. 
Marine. 
V. Animal, p. 65. 
Marine. 
Animal unknown. 
No fossil species of this genus 
has been discovered in the Fresh Water Formations ; the little shellvof the ponds 
of Havre and Magentone have been erroneously referred to it. 
(2) Foss. in the London Clay; Crag Marl ; at Grignon, Chaumont. 
(3) Foss. Grignon, Courtagnon. 
(4) Foss.in the London Clay; Crag Marl; at Grignon, Presles. 
(5) ** The museum of Mr, Bullock contains the largest known specimen of the 
Aciona Scalaris, which was purchased at a sale for twenty-seven pounds; but it 
4s now estimated at worth more than double that sum,”—Leach’s Zoological Mis- 
ecllany, vol, 2, 1815, 
C 
