OLIVA. MOLLUSCA. 25 



at the base, with interrupted white bands ; spire flat, marginate, 

 acuminate. 2J inches long. Inhabits the Indian seas D'Ar- 

 genv. pi. 12, fig. T. 



C. virgo, Lin. Shell turbinate, pale yellow or white, deep blue at 

 the base ; spire convex, obtuse. 4 inches long. Inhabits the 

 seas of India. Klein, Ost. pi. 4, fig. 83. 



C. Ammiralis, Lin. Shell turbinate, yellowish brown, marked with 

 trigonal white spots and yellow bands, minutely and intricately 

 intermixed ; spire concave, acute. Inhabits the Indian and Af- 

 rican seas, &c D'Argenv. pi. 12, fig. N. 



Of this beautiful shell there are many varieties, some of which are highly esteem- 

 ed by collectors. 



Fossil species of Cones have been found on the Continent in Piemont, at Grignon 

 near Versailles, at Courtangon in the environs of Bourdeaux, and in Britain in the 

 London clay. 



Gen. 2. OLIVA, Lam. Valuta, Lin. 



Shell subcylindrical, convolute, smooth and glossy ; spire short, 

 with canaliculate sutures ; aperture longitudinal, emarginate 

 at the base ; columella obliquely striated. 



The Olives are much esteemed for the beauty of their colouring, their agreeable 

 form, and brilliant lustre. They are distinguished from such of the cones as ap- 

 proach them in form by the deep channel which separates the turns of the spire. 



O. porphyria, Lam. Shell pale flesh colour, spotted with red, orna- 

 mented with red angular lines ; spire and base tinged with purple. 

 4 inches long. South American Seas D'Argenv. pi. 13, fig. K. 



O. erythrostoma, Lam. Shell whitish, ornamented with longitudinal 

 flexuose brownish lines; two transverse interrupted brown bands; 

 inside of the mouth orange or saffron coloured. 3 inches long. 

 Inhabits the Indian seas. Rumph. Mus. pi. 39, fig. 1. 



O. maura, Lam. Shell cylindrical, black ; the inner lip somewhat 

 plicate ; spire short ; the mouth white. 3 inches long. Inhabits 

 the Indian seas. Lister, pi. 718, fig. 2. 



O. oryza, Lam. Shell ovato-conical, pure white ; spire conical. 3 

 or 4 lines long. Inhabits the seas of the west Indies. Lam.vii. 429. 



This is a small species, very common, and much resembling in appearance a 

 grain of rice. 



Fossil species of this genus are found on the Continent in the neighbourhood of 

 Paris and Bourdeaux, and in Britain in the London clay. 



Gen. 3. ANCILLARIA, Lam. Valuta, Lin. 

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

 the sutures ; aperture longitudinal, scarcely emarginate at the 

 base, effuse ; a callous oblique varix at the base of the colu- 

 mella. 



The Ancillariae are intermediate between the Olivae and Terebella. From the 

 former they are distinguished by the want of a channel between the turns of the 

 spire, and from the latter by the oblique callosity at their base. They are all ma- 

 rine. The fossil species are numerous ; and a few are found in Britain. 



A. cinnamomea, Lam. Shell oblong, ventricose-cylindrical, chest- 



