Lamarck's Genera of Shells, 67 



visional receptacle, in which Linneus placed all the univalve shells, 

 whose classification puzzled him; thus he considered the tere- 

 bellum to be of the same genus as ovula, bulla proper, achatina, 

 certain pyrulce, &c, in spite of the disparity of these associations. 



The terebellum has no epidermis, it is a thin, smooth shell, and 

 when we look at its back, appears to be irregularly notched at the 

 base. It most resembles the ancillaria, oliva, and conus, and has 

 some slight similitude to the young cyprsea. 



Type. Terebellum subulatum*. (Bulla terebellum. Linn.) 



Shell cylindrical-subulate, thin, smooth, delicate ; spire distinct ; 

 left lip resting on the columella. Indian Ocean. PI. v. Fig. 205. 

 1 Recent species, and 2 fossil. 



4. Ancillariaf- 



Shell oblong, subcylindrical ; spire short, not channelled at the 

 sutures. Aperture longitudinal scarcely notched at the base, 

 effuse. A callous, oblique varix at the base of the columella. 



The ancillaria has great resemblance to the oliva, but the upper 

 edges of the whorls of the spire rest, each respectively, against the 

 preceding whorl, and are not separated from it by a spiral canal, 

 as is the case with the olivse. The callous, oblique varix, at the 

 base of the columella, distinguishes this genus from terebellum and 

 buccinum. 



The aperture of the ancillary is longitudinal, but never extends 

 through the whole length of the shell. They are sea shells, and 

 more numerous in fossil than in recent species. 



Type. Ancillaria cinnamomeal. 



Shell oblong, ventricose-cylindrical ; chesnut yellow; a light 

 coloured or whitish band on the upper part of the whorls ; colu- 

 mellar varix red, substriated. (Locality not given.) PI. v. Fig. 206. 

 4 Recent species, and five fossil. 



5. Oliva §. 



Shell subcylindrical, convolute, smooth ; spire short, sutures 

 channelled. Aperture narrow, longitudinal, and notched at the 

 base. Columella obliquely striated. No operculum. 



* Awl-iha\>tt). |- From uncilla, a damsel. X Cinnamon colour. § An olive, 

 F 2 



