LITHODOMUS, 



as well as in the Coral rag;, and Pisolite, and are also 

 found in the tertiary beds of marine origin, are very 

 common in this country; tliey have been called Fistulanae, 

 (but improperly), owing to a mistake caused by the 

 decomposition of the madrepore in which they have 

 dwelt, around them, leaving them apparently included 

 in an echinated clavate case. 



Besides the common species, we have represented a 

 small specimen of fossil madrepore from the great Oolite, 

 showing several specimens of Lithodomi inclosed in 

 the above mentioned cases, and also one with a calca- 

 reous deposition upon the posterior end, in the form of 

 the beak of a Crossbill. 



Fig. 1. & 2. Litkodomus Dactylus, Nob. 

 3. & 4. - caudigerus* 



5, a fossil species in a madrepore^ from the great 



Oolite. 



