MOORE — ON NEW BRACHIOPODA, ETC. 



191 



the presence of two species of this genns in oolitic strata, although in 

 both instances they have become very degenerate in size. No larger 

 specimens of the genus have yet been found in the same beds to 

 which these diminutive shells can be referred. 



Terebratula (?) mtnufa. Moore. PI. ii., figs. 21, 22. 



Shell very small, smooth, inequivalve, longitudinally oval, with 

 large triangular deltidium ; valves equally convex ; hinge-line 

 straight. The dorsal valve is usually square, and its inner side pos- 

 sesses a broad flattened septum, nearly the length of the shell, and 

 dividing it into two equal portions. 



Obs. — I have been unable to determine the form of the loop of 

 this shell ; and until this has been seen it will be doubtful whether it 

 be a true Terebratula. Should it be such, it will be the smallest 

 known species with which we are acquainted. It is from the coral- 

 line bed of Hampton Cliffs, Bath. It differs entirely from any other 

 Terebratula found in the Great Oolite ; and although so small, appears 

 to present the characters of an adult shell. 



ffliynchotiella (?) coronata. Moore. PI. ii., figs. 23 — 25. 



Shell small, smooth, rounded ; ventral valve rather convex ; dorsal 

 more flattened, and with a slight sinus ; beak produced, with a large 

 triangular deltidium, bordered by a narrow area, from which spring 

 two raised lateral ear-like processes, which again fold over upon the 

 area. Under the above the valve possesses strongly marked hinge- 

 teeth. 



The shell is from the Upper Lias of Ilminster, whence I have 

 nine examples. The lateral ear-like expansions give to it a very 

 peculiar appearance. With some little doubt it is referred to Rhyii- 

 chonella, though the shell-structure appears to agree most with that 

 genus. 



In addition to the foregoing new species, the observations recorded 

 in this paper show that the vertical range 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 kind hints I have always been indebted in my study of the 

 Brachiopoda, has shown the continuity of some species in the 

 Carboniferous and Permian eras ; a fact which has since been 

 more fully noticed by Mr. J. W. Kirby, in the Quarterly Journal of 

 the Geological Society for November last, and in the same number 

 may be found the interesting conclusions arrived at by Messrs. Jones 

 and Parker bearing on this point, and having reference to the 

 extraordinary range of some of the Foraminifera. 



The range of specific forms is a question to which the attention of 

 palaeontologists should be especially directed. 



