MELVILL : ON CONUS COnOMANDELICUS. 



171 



spire in the body-whorl of the recent form, C. dormitor being an 

 exact double cone. In all other vital points the closest similitude 

 prevails : both possessing smooth apical vrhorls, number of these 

 identical, say 7-9, sculpture very akin, allowing for a certain 

 intensification of the surface-pattern, sulcation, and ribbing of the 

 Eocene species, while the live C. Coromandelicus, in prime condition, 

 has its costae and ornamentation of the upper whorls of a more 

 mellowed pronouncement. In form, save for the particular 

 mentioned above under (b), they are very similar, the effuse thin 

 outer lip receding at the sinus, and almost indicating Pleurotomid 

 characters to both species, the cone-like aperture being wider in the 

 recent form, which is, in some examples, slightly more produced at 

 the base. 



1. Conus [Conorbis) Coromandelicus (Smith). 



2. ,, ,, dormitor (Solander). 



Conorhis, a genus instituted by Swainson ' in 1840, was formed to 

 receive the old Conns dormitor,'^ Solander, 1766, and consists of but 

 few species, only one other, C. alatus, Edwards, existing in the 

 Barton Beds. Three species, C. marginatus (Lam.), subangulatus 

 (Desh.), and ceqnipartitus (Cossmann), occur, however, in the Middle 

 Eocene (Calcaire Grossier) of the Paris Basin.' Conorhis dormitor is 

 well figured by Soweiby, Min. Conch., 1821, pi. 301, fig. 2 ; 



• Malacology, pp. 149, 312. 



2 Brander's Foss. Hant., p. 23, pi. i, fig. 24. Also Brit. Oligocene and Eocene 

 Moll., by R. BuUen Newton, p. 130. 



* Cf. " Th* Eocene and Oligocene Beds of the Paris Basin," by George F. Harris 



and Henry W. Burrows. 



