DESCRIPTION. 



PLATE XXVII. 



Fig. 1. Turbo madreporoides. 



This shell, if such it be, was lately sold with two 

 others of the same description, at the sale of Lord 

 Bute's collection, and was purchased by Mrs. 

 Mawe. The species was brought originally, it is 

 believed, from the coast of Africa, by Captain 

 Young. 



It is certainly extremely doubtful even to what 

 Order this curious specimen belongs. Upon a 

 minute examination of its external characters, and 

 of such internal parts as have been perforated by 

 marine insects, we need not hesitate to pronounce 

 what it is not ; what it really is, must still remain 

 to be determined. The calcareous matter of which 

 it is composed seems to be agglutinated in a dif- 

 ferent manner from that of Madrepores and Corals, 

 to which it bears the most remarkable resemblance. 

 The olive-green spots, which are often raised above 

 the yellowish white surface, appear of the same 

 construction with it, and are not regularly stellated, 

 or more deeply pored. The arms are solid, and 

 penetrated with the green colour in spots through- 



