174 PArERS, ETC. 



found in the great Oolite ; and altliough so small, appears 

 to present the characters of an adult shell. 



RnYNCnoNELLA (?) coROiSrATA, Moore. 

 PI. II., figs. 23-25. 



Sliell small, smooth, rounded ; ventral valve ratlier con- 

 yex ; dorsal more flattened, and Avith a sliglit sInus ; beak 

 produced, with a large triangulär deltidium, bordered by a 

 nan'ow area, from wliich spring two raised lateral ear-like 

 processes, which again fold over upon the area. Under 

 the above the valve possesses sti'ongly marked hinge-teeth. 



The shell is from the Upper Lias of Ilrainster, whence I 

 have nine examples. The lateral ear-like expansions glve 

 to it a very peculiar appearance. With some little doubt 

 it is referred to Rhynchonella, though the shell-structure 

 appears to agree most with that genus. 



In addition to the foregoing new speeies, the observations 

 recorded in this paper show that the vertical ränge of other 

 previously known Brachiopoda has been extended beyond 

 the zones to which they were supposed to be confined. My 

 friend Mr. Davidson, to whose klnd hints I have always 

 been indebted in my study of the Brachiopoda, has shown 

 the continuity of some speeies in the Carboniferous and 

 Permian eras, a fact which has since been more fully noticed 

 by Mr. J. W, Kirby, in the Quarterhj Journal of the 

 Geological Societi/ for November last, and in the same 

 number may be found the interesting concluslons arrived at 

 by Messrs. Jones and Parker bearing on this point, and 

 having reference to the extraordinary ränge of some of the 

 Foraminifera. 



The ränge of specific forms is a question to which the 

 attention of palteontologists should be especially directed. 



