SPIRIFERA. 43 



belongs undoubtedly to Phillips's Sp. insculpta, of which I was able to convince myself by 

 the comparison of the original specimens of both, Professor M'Coy's very imperfect 

 specimen having been kindly lent for the purpose by Dr. Griffith, of Dublin. 



Loc. Professor Phillips obtained his examples from Bolland. Mr. Parker has it 

 from the Clitheroe quarries, in Lancashire. The Geological Survey possesses a fine series, 

 of different ages, from Yorkshire, and Longnor, Derbyshire. In Ireland it is found 

 at Ardagh (Drumcondra). M. De Koninck mentions the shell from Vise and Tournay, in 

 Belgium. 



Spirifera Reedii, Dav. Plate V, figs. 40 — 47. 



Spec. Char. Longitudinally oval, valves almost equally convex ; hinge-line shorter than 

 the greatest breadth of the shell; lateral margins and cardinal angles rounded; area 

 small, triangular, elevated ; beak produced and incurved. Each valve is ornamented by 

 from nineteen to twenty-three small, radiating ribs, of which the central one in the dorsal 

 valve is rather wider, and a little more produced, than the lateral ones -. to this corresponds 

 a shallow, small, longitudinal sinus in the opposite valve. Dimensions taken from two 

 examples have produced — 



Length 9^, width 7, depth 6^ lines. 

 5, „ 4, „ 3 lines. 



Obs. I have been able to examine but three individuals of this little species, one 

 adult (fig. 40), in the British Museum, and two younger shells (figs 43 and 47), in the 

 possession of Mr. Reed, of York. They are distinguished from Sp. sexradialis, Phillips, 

 by their larger number of ribs, smaller fold and sinus, and lesser width near the hinge- 

 line. 



Loc. Settle, Yorkshire. 



Spirieera decemcostata, M'Coy} Plate VII, fig. 23. 



Spirifera decemcostata, M'Coy. Synopsis of the Carb. Fossils of Ireland, p. 131, 



pi. xxii, fig. 9, 1844. 



" Spec. Char. Semicircular, gibbous, smooth, twice as wide as long ; front rounded, 



1 The single and imperfect valve upon -which this species was founded, was kindly lent to me by Dr. 

 Griffith ; but from such incomplete material it would be more than hazardous to decide as to its specific value. 

 Under these circumstances I have preferred to simply reproduce the author's description, that the reader 

 may have before him all that has been published on the subject. M. De Koninck informs me that, he 

 has found similar decorticated valves near Dinant, in Belgium, and seems inclined to refer Sp. decem- 

 costata to S. laminosa, M'Coy ; but the evidence does not permit my confirming the statement. 



