ODOSTOMIA. 137 



Cattegat), and also among: shells collected by M. Cail- 

 liaud in Brittany, bv M. Mace at Cannes, and by Mr. 

 M f Andrew (of a smaller size) off Teneriffe ; it was like- 

 wise procured by me while dredging in the Gulf of 

 Spezzia. 



The animal floats, like a Jeffreysia ; and, when crawl- 

 ing, it has the same habit of withdrawing its eyes, which 

 are visible through the shell. It appears to be inactive, 

 because Foraminifera are sometimes seen attached to 

 living specimens. This species is remarkable for its 

 contracted mouth; it is much more slender than 0. uni- 

 dentata, the peripheral keel is less distinct, the base is 

 scarcely angulated, and the tooth is proportionally 

 smaller and not so prominent or conspicuous. Although 

 variable in size, it never attains half the dimensions of 

 that species. 



I have united 0. striolata with the present species, 

 in consequence of finding intermediate forms which may 

 belong to one or the other. I must also refer to it the 

 varieties a and b of O. plicata, described in my mono- 

 graph. 



15. O. plica'ta"*, Montagu. 



Turbo plicatus, Mont. Test. Br. (ii.) p. 325, t. 21. f. 2. 0. plicata, F. & H. 

 iii. p. 271, pi. xcviii. f. 1, 2. 



Body whitish, with minute and close-set yellow specks : 

 snout small, wedge-shaped, flexible and extensile : tentacles 

 leaf-like, and presenting three equal-sized, angular and flat- 

 tened sides, which are folded a little inwards ; tips rounded 

 but not much inflated : eyes not quite so close together as in 

 some other species, seated on the tentacles, at their inner 

 bases : foot squarish in front and bluntly pointed behind ; sole 

 slightly grooved lengthwise on the posterior half. 



Shell slender, with a narrow and attenuated base, thin, 



r 



* Furnished with a plait or fold. 



