XXV 



PORONIA (m). 

 Rulra (KelliaR. 51.) 



Oblonga, 52. 

 MONTACUTA. 



Sulstriata, 5 1 . 



Bidentata, 52, / 58, 

 Ferruffinea, 52, f. 16. 



M.? Purpurea,/. 14 (w). 



(wz) A genus established by M Recluz in the Revue 

 Cuverienne of last year. Although nearly allied to 

 Kellia, it is evidently a natural genus, and is most easily 

 recognised by the broad Hgamental plate. The charac- 

 ters are as follows : " Ovate or roundish, transverse, 

 equivalve inequilateral, closed. Two cardinal teeth in 

 each valve, (but not as in Kellia on the same side of the 

 umbo.) A ligamental pit running alongside of the single 

 lateral tooth. Muscular impressions oval, equal. No 

 pallcal sinus. 



(n) I received from Mr. Bean of Scarborough some 

 shells thus named. They are so minute as almost to 

 baffle microscopic observation. I perceive, however, two 

 approximate cardinal teeth on the same side of the umbo, 

 and a very indistinct anterior lateral one. These charac- 

 ters are those of Kellia proper. The ligament is very in- 

 distinct. The shell is elliptical, smooth, glossy, very in- 

 quilateral, pale olive with a purplish tinge at the beaks, 

 pellucid, 



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