45 



of a species, not, I believe, described. The inferior extremity, though 

 somewhat crushed, still yields marks of. its having there had its articula- 

 ting surface. It is rendered very different from any belemnite or echinital 

 spine which I have ever seen, from its surface being pierced with nume- 

 rous small, but distinct, and somewhat regularly disposed foramina. 



Of the class Spatkula, in which are comprised small flattish spines, 

 dispersed, in some species of echini, among the larger and more cha- 

 racteristic spines, I do not know of .the existence of any fossil species ; 

 neither do I find any information respecting any fossils of the fourth 

 class, Radiolus coronatus, figured by Klein, Tab. xxxu. K. ; and by 

 Scheuchzer, Physic. Sacr. Tab. LVI. The figure, indeed, of this spine, 

 gives rather the idea of its being a spine of the genus Sudes fortalitio- 

 rum, which has suffered injury, and has been repaired by the powers of 

 the animal. 



The very curious spine, Plate IV. Fig. 12, from the neighbourhood 

 of Verona, is referable, I conceive, to this class, or to Sudes villarum 

 serrate compress^. I am entirely ignorant of the echinus to which it 

 belongs. 



The class CLAVICULA contains many spines, which are exceedingly 

 interesting in their forms. The first species, termed Glandaria, from 

 the supposed resemblance of these bodies to acorns, are divided into 

 those which are smooth and those which are granularly striated. Two 

 of the latter, of different sizes, are represented Plate IV. Fig. 9 and 11. 

 No echini, recent or fossil, have been found to which these large glan- 

 diform bodies are known to belong. 



Plate IV. Fig. 1, 18, and 21, may be regarded as those varieties of 

 this species, which formerly were considered, from their figure, as 

 petrified olives, or Lapides Judaici. Their recent analogue is still un- 

 known ; nor was it, until of late years, that it was known to what genus 

 of fossil echini these bodies belonged. 



This circumstance was first ascertained and made known in the highly 

 interesting travels of M. De Luc, who discovered one of these clavated 

 spines attached to a portion of the shell. Tom. iv. p. 4(57, Tab. xii. 



