322 Mr. J. Mac Adam and Prof. W. Thomson 



has furnished me with a drawing of it, twice magnified, and also 

 with the following minute description, which testifies most fully 

 the pains he has taken, and for the accuracy of which I can 

 vouch most satisfactorily. To Professor Thomsom my warmest 

 thanks are due for his trouble, and to him the entire credit must 

 be given for the palseontological investigation. 

 Belfast, April 8, 1858. 



Description of the Fossil. By Prof. Wyville Thomson. 



Class CEUSTACEA. 



Subclass CmUIPEDIA. 



Family Lepadid^. 



Genus Loricula (G. B. Sowerby, jun.). 



Loricula MacAdami (Wyville Thomson). 



Capitulum of (probably) from ten to twelve valves. 



Peduncular plates in the seven transverse rows next the capitu- 

 lum not more than eight in number, the plates adjoining the 

 scutum and scutal latus much lengthened, formed apparently 

 by an amalgamation of two plates, one corresponding to each 

 of the valves. 



Locality. Upper Greensand, passing into Lower Chalk. Black 

 Head Bay, Co. Antrim. (Mr. MacAdam's cabinet.) 



This interesting specimen consists of one side of a capitulum, 

 well preserved towards the left hand, some- 

 what shattered and displaced towards the 

 right, showing five nearly complete valves, 

 with the edges of two others, and a pe- 

 duncle of imbricated plates with the upper 

 portion perfect, or nearly so, on the left, 

 much broken on the right ; the lower 

 part somewhat imperfect, but showing 

 well the loricated structure, and pro- 

 duced to a ring of plates forming evidently 

 a base of attachment. 



The matrix is a soft, marly greensand, 

 too friable to admit of the specimen being 

 further exposed with safety. The calca- 

 reous plates are preserved, — white, very 

 thin and friable, with a tendency to Loricuia MacAdami. 



■t rr Magnified twice. 



The specimen is in the same position as Mr. WetherelPs 

 unique example of Loricula pulchella, Sow., and I shall adopt 



