The peculiar structure of this extremity of the animal is very clearly 

 displayed, in the beautiful polished agatine specimen, from Soissons, 

 which has been divided by a longitudinal section. Plate XVI. Fig, 13. 



In this specimen, but particularly in its lower part, the vertebral 

 column itself, is seen surrounded by numerous investing tunics. 

 These, at their lower part, are spread out like roots, and are evidently 

 well calculated to fix the animal to his devoted spot, whilst a little 

 higher up these several tunics cohere together, as well as with the 

 column which they include, and having their crenulated articulations 

 exactly concur with those of the included vertebra, they form a ver- 

 tebral column, which, having thus acquired a considerable additional 

 degree of solidity, must have evidently been well calculated to form 

 the main support of the animal. 



In the several species of encrini which have been hitherto treated 

 of, it was found necessary to notice how very few specimens of their 

 extremities have been found, in comparison with the remains of the 

 trunk of the animal. This, however, is not the case with this species, 

 since both the extremities of the animal appear to be tolerably abun- 

 dant; indeed, judging from the specimens of this fossil, which I have 

 obtained, remains of its superior and inferior parts appear to have ex- 

 ceeded in proportion those of its vertebral column. 



The lower extremities of this species of encrinite, we have already 

 seen, have been found in Wiltshire and at Soissons. They have also 

 been found at Pfeffingen, in Germany, but no correct notion respect- 

 ing them had been hitherto formed. 



Mons. le Professeur d' Annone fa voured Mr. Walch with drawings for 

 three plates, from specimens in his museum, obtained from Pfefiingen^ 

 and which were employed by Mr. AValch in Knorr's elegant work, 

 and illustrated by Mons. d'Annone's observations, which I shall now 

 proceed to notice *. You will, whilst attending to these remarks, be 



* Recueil des Monumens, &c. Tome II. Sect. II. p. 119. 



