MONOGBAPH OF THE GENUS 

 CAKINARIA, Lamarck. 



Testa vitrea, pileiformis, concentrice rugata, dorso carinato, 

 apice subplanulatim spirali. 



Shell glassy, cap-shaped, concentrically wrinkled, with a dorsal 

 keel and a nearly tlat spiral apex. 



The Carinaria is an oblong mollusk, provided with a broad fin, 

 by means of which it moves very rapidly through the ocean. The 

 beautiful glassy shell which it secretes forms a protection to the 

 breathing apparatus. 



SPECIES. 



1. C. vitjuea, (f. 4). — T. elevata, subtrigoiiii, lateiibus recti- 

 usculis, apice parvo, uncinate*. — -Distinguished by its elevated, 

 conical form, nearly straight sides, and small apex. 



2. C. ckistata (f. 2, 3), Linn. — T. depressa, oblonga, dorso 

 arcuato, latere postico declivi, apice lato, deflexo. — Of an oblong, 

 depressed form, with the back arched, the posterior side sloping, 

 and the apex broad and curved downwards. 



3. C. Atlantica (f. 1), Ad. S," lire. — T. subelevata, curia, 

 dorso valide arcuato, carina lata, apice arcuatim depresso, corneo. 

 — This pretty little species is shorter, with the back more curved 

 and elevated than 0. cristata. It has a horny nucleus. 



Not identified. 



C. Gaudichaudi, — . 

 C. punctata, Orb. 

 ( '. depressa, Baux. 



