﻿DE ECHINIS. 



195 



"Fig. 3. The Echinocoryta, like marble, ashy grey, representing with the greatest 

 exactness the internal face of the shell. [This is a siliceous mould of an Echinoconus.~] 

 Eig. 4. The base. [Siliceous mould of the base of a small Echinocorys vulgaris.] 



Genus IV. — The Echinanthus is an Echinus whose oral aperture is near the centre, 

 and the anal upon or at that part of the margin which is at the greatest distance 

 from the oral. 



All the species of this genus have an oval figure, one extremity of which is narrower, 

 the other broader, in which latter the anal aperture is always situated ; but the poriferous 

 zones in the upper surface resemble a five-petaled flower, as though they were artificially 

 marked by a needle ; and for this reason I have assigned to this genus the name of 

 Echinanthus or Urchin flower. 



It is termed by Woodward Echinus pentaphglloides, i. e., five-leaved, and is repre- 

 sented as having only one foramen in the centre of the base ; whereas, on the contrary, 

 the other foramen is conspicuous upon or at the margin in both the fossil and the recent 

 species. 



Eig. 1. The Echinanthus, with the vertex (upper surface) more or less raised, of a 

 whitish colour. Erom the Kleinian Museum. This species seems to approximate in the 

 outward shape of an helmet to the Echinocorys, but it differs from it sufficiently in the 

 position of the mouth, and in the likeness of the flower at the summit. 



Eig. 2. The base. This fossil Echinanthus, filled with chalky matter, is depicted in 

 the ' Museum Amboinse,' Tab. LIX, fig. d. 



Fig. 3. An Echinanthus of flatter form ; fossil ; filled with stony matter. Erom Monte 

 Baldo, near Verona ; remarkable for the upper surface with the anal aperture. 



Eig. 4. An Echinanthus with the dorsal region more or less raised along its length ; 

 fossil ; filled with stony matter of an ashy colour. 



Fig. 5. The base. The oral aperture near the centre, the anal on the margin. In 

 this genus the anal aperture is generally so situated that it can be viewed equally well 

 from both the summit and the base. On this account I am the more astonished that 

 Woodward should have overlooked it." 



[Plate LVIII, Pygurus lampas, represents a type form of this genus.] 



