20 



genus. This species is in the shape of a pointed five-sided cone, in the 

 vertex of which are five small foramina, from which proceed five small 

 arese, hordered on each side by bi porous ambulacra ; the remaining 

 space being filled by five larger areae. The mouth is small, somewhat 

 retracted; and the anus sometimes inclining to oval. This species is 

 figured and described by most oryctologists, in consequence of the fre- 

 quency with which it is found. But it exists nowhere, perhaps, in 

 greater number, than in. England ; particularly, according to Dr. Plott, 

 in the southern counties, where the black flint most abounds. Plate II. 

 Fig. 10, is a fossil of this species, from the Kentish chaik-pits ; and 

 Fig. 11 is a representation of its under part. 



Leske refers the Echiniten pileatum, ore pentagono of Melle, Tab. i. 

 Fig. 2, to this genus, considering it as its second species, which he 

 distinguishes as Echinites depressus. The Globulus of Klein, Tab. xiu. 

 Fig. c k, and Tab. xiv. Fig. a k, is denominated Echinites vulgaris by 

 Leske, and considered as the third species. These fossils are in general not 

 more than half the size of Conulus albogalerus ; and, like it, are divided 

 into five large and five small arese, by ten ambulacra. In general, these 

 fossils are merely casts, and do not retain sufficient distinctive characters 

 to allow of their subdivision, even into varieties. These fossils, like the 

 former, are described by almost every oryctologist, and are very fre- 

 quently found in the gravel of different parts of England : they are the 

 chelonites of Mercatus, and the brontitt and ombria of many authors. 

 Plate II. Fig. 3, is a fossil of this species from Sussex. Two other spe- 

 cies of this genus are mentioned by authors, varying in the number of 

 their ambulacra : these are, however, of very rare occurrence. One of 

 these species has only four fascia or areolae, and is named Echinites qua- 

 terfasdatus. This is figured by Leske, Tab. xi/vn. Fig. 3, 4, 5. It is 

 also figured by Walch and Gehler. The other species, Echinites sexies- 

 fasciatus, has six bands. This species has been figured by Klein, Act Ge- 

 dan. ii. Tab. v. Fig. 14 and 15, as well as by the authors just mentioned. 



The second genus of this section is Discoides, the only species of 



