( 41 ) 



DIVISION XX. ANG YOSTOM ATA . 

 GENERA. 



A. JVith foldsj plaitSj or wrinkles^ on the columella. 



1. Cassis. (1) Brug. 



Oval ; mouth oblong or Columella covered with Marine. 



narrow; the notch termi- a plate formed by the left Generally in warm 



nating in a short canal re- lip, wrinkled transver- climates, at some dis- 



flected towards the left at sally. tance from the shore, in 



thebase; right lip wrinkled sandy bottoms, 



tiansversally. V. Animal, p. 70. 



a. The callous pad of the lip dentated exteriorly towards the notch. PI. 11, 



fig. 11. 



b. The callous pad of the lip not dentated exteriorly towards the notch. 



2. Cypr^a. (2) Lam. 



Oval, gibbous in the Mouth long, narrow, 

 middle, and narrowed at wrinkled transversally 

 both ends ; lip rolled in- on both sides, 

 wards : no epidermis. PI. 

 11, fig. 7, 9. 0, b, c. 



3. Oiiva. (3) Lam. 



Sub-cylindrical ; notch- Columella striated ob- 

 cd at the base ; mouth nar- liquely. 

 row ; channels between 

 the whorls of the spire. 

 PI. 11, fig. 13. 



4. Conoelix. Swainson. 



Coniform ; spire very 

 short ; mouth linear, nar- 

 row. PI. 12, fig. 1. 



Columella plaited. 



Marine. 



V. Animal, p. 68. 



Marine. 



In warm climates. 

 V. Animal, p. 68. 



Marine. 



Pellew Islands, Ota- 

 heite. 



5.. Voluta. (4) Lam. 



Oval ; spire varying in Columella with folds, Marine- 



projection, summit obtuse the lowest the largest. Generally in warm 



ornippled. PI. 12, fig. 2, climates. 



3, 4, 5. V. Animal, p. 68. 



a Cymbium, Montf. The last whorl ventricose. 



b Voluta, Montf. The last whorl conical, narrowing at the ends. 



(1) The fossil species (and amongst them the Cassis LI ar pee for mis, pi. 11, fig. 42) 

 are found only in the newest formations, and it is remarkable that they are very 

 small, compared with the living ones, which are sometimes of a considerable size. 

 They have been found in England in the London Clay and in the Crag Marl. 



(2) In the infant state, the Cyproza resembles a small thin Ancillaria, curved and 

 truncated at the base, pi. 14 , fig. 9, a ; in the middle age, it is thin, with a project- 

 ing spire, pi. 14 , fig. 9, b ; when adult, it is thicker, and the spire is covered, pi. 14 , 

 fig 9, c. Foss. in the London Clay ; at Grignon. 



(3) Foss. at Grignon ; Aiimont, near Montmorency. 



(4) Foss. in the London Clay ; in the Crag Marl ; at Grignon ; Couriagnon ; 

 Chaumont; Beauvais, ' 



