190 UPPER, OR FLINTY CHALK. 



tubercles, surmounted by imperforate papillae, generally fifteen in each 

 row ; these are larger and more distant on the circumference or ambit of 

 the shell, than on the vertex and base. The larger areee have two sets of 

 papillary tubercles, extending from the vertex to the base ; and also two 

 short rows that arise at the vertex, but do not reach below the circum- 

 ference of the shell; hence there are thirty rows of tubercles on the 

 vertex, and but twenty on the base. This remarkable character is seen m 

 every specimen that has been submitted to my notice, and distinguishes 

 the present species from Cidaris mamillata, with which it corresponds in 

 every other respect. The ambulacra are quadriporous on the vertex, but 

 become biporous on the circumference and base. 



I have named this elegant species in honour of Chas. Konig, Esq., of 

 the British Museum. 



LocaUties. Upper chalk, near Brighton and Lewes ; casts occur in 

 the flints of the South Downs. 



34. Cidaris co?'ollar{s. Tab. xvii. fig. 2. 



This name is applied by Mr. Parkinson to a siliceous nucleus, moulded 

 in the cavity of a species of Cidaris variola. (Echino-cidaris of Konig). 

 Specimens are not unfrequent among the flints on the ploughed lands of 

 the South Downs. 



CoNULUs. (Echino-pileum of Konig). Conical, or oval, with porous 

 ambulacra radiating from the summit to the base ; mouth central, vent 

 situate in some part of the base or margin. 



35. Conulus albogalerus. Tab. xvii. figs. 8. 20. 



Obscurely pentagonal, divided by ten biporous ambulacra, into five 

 large, and five very small areas ; surface covered with minute granulae. The 

 vent placed on the margin ; vertex with five perforations. 



This species is very common in the Kentish chalk-pits, but is seldom 

 found in Sussex. 



Fig. 8, a lateral view'; fig. 20, the base of the same specimen. 



Localities. Upper chalk, near Lewes. 



36. Conulus albogalerus, var. acuta. (Konig). Tab. xvii. figs. 16. 19. 

 In this variety the apex is acute, in other respects it differs but little 



