MOORE — ON NEW BRACHTOPODA, ETC. 
191 
the pi'esence of two species of this genus 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. 
Terehrakda (?) minuta. 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 Grreat Oolite ; and although so small, appears 
to present the characters of an adult shell. 
Bhynchonella (?) 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 Rhyn- 
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. 
