268 



TRANSACTIONS OF THE 



Productus, Sow. 



p. co?tfragosus. PI. 12, fig. 5. Shell suboval, 

 larger valve with a longitudinal sulcus ; valves with nu- 

 merous rugose concentric lines, and long filiform spines. 



In slate, stratum K of Mr Miller^s section ; the shell 

 has been replaced by pyrites. 



Numbers are in a specimen of slate, all very much 

 distorted by pressure ; the perfection of the filiform 

 spines is remarkable. In the cabinet of Richard C. Tay- 

 lor, Esq., are European specimens of two species, which 

 evidently possessed spines similar to those of the confra- 

 gosus, as fragments of the spines clearly exhibit ; and 

 many other species were doubtless armed in a similar 

 manner. On one specimen of the slate, a fern is asso- 

 ciated with numbers of the present species of productus.* 



Pecten. 



P. mmigerus. PL 12, fig. 3. Shell ovate, with an- 

 gular cost38, and slender, erect, very prominent spines ; 

 ears unequal ; one ear of the left valve elongated and 

 pointed. 



In slate ; the interior of the left valve is the only spe- 

 cimen I have seen, but it is remarkably perfect and dis- 

 tinct. 



The following fossils accompanied the shells here de- 

 scribed: 



Productus scoticus, Sow. 

 Productus sulcatus, Sow. 

 Unio, allied to U. subconstrictus, Sow. 

 Spirifer undulatus. Sow. 

 Cyathophyllum ceratites, Gold. 



* The European specimens of Producta, with spines, I collected from the 

 dark limestone shale of Berwick upon Tweed, and from a similar shale at 

 Abersychan Iron Works, Monmouthshire. R. C. T. 



