Mr. G. B. Sowerby, Jun., on a new Fossil Cirripede. 261 



majori, margine antico subrotundato, subarcuato ; parte principali 

 (pedunculo ?) ad basin gradatim attenuata, squamarura seriebus 

 (utrinque ?) quatuor ; squamis transversis, marginibus arcuatis, 

 terminalibus acutis alternatim interpositis (sicut piscium squamis); 

 serie antica, squamis brevibus, ad marginem externum rectis, se- 

 riebus medianis duabus squamis elongatis, utrinque acuminatis, 

 serie postica squamis brevioribus ad marginem externum rectis. 



You mil perceive tbat in the above no more is described than 

 is visible ; but by the hypothetical introduction of the word 

 " utrinque/' my belief is expressed that each row of scales and 

 each apicial valve is repeated on the opposite side, so that the 

 apex would consist of three pairs of valves, and the body or 

 peduncle of eight series of scales. These scales increase in width 

 towards the centre and thence gradually diminish, until at the 

 base they are so narrow as to leave a doubt whether there be any 

 tendinous process of attachment, as in other pedunculated Cirri- 

 pedes ; or whether the animal may have lived, like Acasta, unat- 

 tached, although confined in the hollow of some of the numerous 

 sponges found in the same formation. 



The two central rows of scales on the side under observation 

 are united with each other and with the other two by the alter- 

 nate intersertion of the pointed ends, while the external edges of 

 the other two rows are straight, so that the shell might be split 

 into two halves without cutting through a single scale. 



With regard to these series of large scales, it is difficult to de- 

 termine whether they be analogous to the minute scales covering 

 the peduncle of the Pollicipes, or to the small lower valves imme- 

 diately surrounding the upper ones. I am rather inclined how- 

 ever to the former supposition, in which case our shell would form 

 a connecting link between the two classes of Cirripedes. 



In the Pedunculated family the upper valves correspond with 

 the operculum of the Sessiles ; the smaller ones which immediately 

 surround them may be compared to the parietal portion, and the 

 peduncle agrees with the base. But in Loricula, these rows of 

 valves or scales, forming so large a portion of the whole body, 

 render them much more comparable with the parietal parts, and 

 therefore bring the shell much nearer to the Sessile family. 



Hoping the publication of these imperfect details may elicit 

 further inquiry, 



T am, dear Sir, yours truly, 



G. B. SowERBY, Jun. 



N, T. Wetherell, Esq. 



