UNIVALVES CONUS* 85 



CONUS Cone. 



DESCRIPTION OF PLATE XX. 



Div. I. Fam. 1. Fig. 1. C. imperiaUs. Dit.II- Fan. 1. Fig. 6. C. ebreeus. 



Fam. 2. Fig. 2. C. monile. Div. III. Fig. 4. C. striatus. 



Fam. 2. Fig. 3. C. generalis. Fig. 7. C. terebellum. 



Div. II. Fam. 1. Fig. 5. C. taeniatus. Dit. IV. Fig. 8. C. tuUpa. 



Shell univalve, convolute, turbinate ; aperture effuse, longitudinal, 

 linear, without teeth, entire at the hose; pillar smooth. 



THERE is, perhaps, no other genus which holds so im- 

 portant a station in collections as the Cones, a ais- 

 tinction to which it is eminently entitled, from the match- 

 less beauty and endless variety of the species. 



The numerous species of the Cones are so suuilar in 

 form, that they have been arranged only into four divi- 

 sions. Those which have a subtruncated base, as the 

 C. marmoreus and C. imperialis, constitute the first di- 

 vision. The C. betulinus may be instanced as an ex- 

 ample of the shells of the second division, which are 

 pyriform and rounded at the base, and have a thick 

 structure. The third division comprises those species 

 which are elongated, and have an acute and promi- 

 nent spire, as the C. generalis, &c. The shells of the 

 fourth division are easily distinguished by their ventri- 

 cose shape and wide aperture. 



Beneath the epidermis the Cones have in general a 

 smooth surface, and in most instances a high natural 

 polish; there are, however, some species, as the C.gra- 



