CONUS. 7 



band and used to rasp the food, being replaced by others as soon 

 as those in action are injured by use, that I am inclined to form 

 the Cones into a third suborder, which may be called Toxifera ; 

 and it is probable that the Pleurotomidse, which are described 

 by Loven as having similar subulate teeth in two series, should 

 be placed in the same suborder, as they appear to differ from the 

 Cones chiefty in the veil being truncated and not produced round 

 the base of the proboscis." Dr. J. E. GRAY, Ann. and Mag. 

 N. H.,xii, 1853, p. 177. 



An operculum normally exists in all the groups of Conus 

 (probably in all the species), but it is so very small relative to 

 the size of the shell as to have generally escaped observation, 

 and is very seldom preserved in collections. It is corneous, 

 narrowly elongated, with apical nucleus, and the impression of 

 the muscular attachment varies from one-half to two-thirds of 

 the inner surface. The opercula of a number of species of Cones 

 are figured and described by Crosse and Marie, in Journal de 

 Conchyl., 1874. 



Operculum of C. textile, Linn. (PL 29, figs. 92, 93). 



Sections of the shell of Conus, showing the structure and plan 

 of growth, are figured in Structural and Systematic Conchology, 

 i, PI. 1, figs. 6, 7, 8. The anatomy of Conus tulipa, Linn., is 

 illustrated and described in the same work, i, PI. 15, fig. 80. 



Genus CONUS; Linn. 



Shell thick, obconic, whorls enrolled upon themselves, the spire 

 short, smooth or tuberculated ; aperture elongated, narrow, the 

 margins parallel, truncated at the base ; the outer lip with a 

 slight sutural sinus. 



Section I. MARMOREI. 



Conus (typical) of Morch and H. and A. Adams. Coronaxis, 

 Swainson. Rhombus, Montfort. 



C. MARMOREUS, Linn. PI. 1, figs. 1-5. 



White or light pink-white, with chocolate or chestnut reticula- 

 tions, so arranged as to expose the white in rounded triangular 

 large spots; aperture white or light pink. Length, 4-5 inches. 

 Indian Ocean, Japan, Australia, Polynesia, etc. 



The barbed teeth of this species inflict severe wounds. 



