204 SUPPLEMENT TO THE BRITISH 



found which may appear to connect these three forms together, but the group so formed 

 may be connected to many other groups in a similar manner, and so on until all the 

 species of Rhynchonella would disappear. This mode of proceeding, although, perhaps, 

 to some extent correct in the abstract, would not be serviceable to the ends of science. 



Rh. acuta has been found by the Rev. F. Smithe near the bottom of the Middle Lias, 

 or Am.Jamesoni zone, at Churchdown, in Gloucestershire, and in the A. margaritatus zone in 

 the same locality. It has also been quoted by Prof. R. Tate, and others from the A. 

 spinatus zone, or top of the Middle Lias. In Yorkshire it occurs in the zone of Am- 

 margaritatus (bottom seam of ironstone) at Hutton, Guisborough' (Tate), Wilton, 

 Bilsdale (Phillips), Rockcliff (Hutton). Professor Tate found the shell also in the 

 Middle Lias of the Island of Raasay, Scotland. Other localities are recorded in the 

 published description I have given of the species at p. 76 of my Monograph. 



197. Rhynchonella cynocephala, Richard. Dav., Ool. Mon., p. 77, PI. XIV, 



figs. 10—12. 



'o'- 



I have nothing to add to the description I have already given of this species ; but a 

 few words with respect to its geological position may be here appended. In Yorkshire, 

 the species is stated by Prof. R. Tate to occur at the base of the Inferior Oolite along with 

 Am. Murchiso?ii. In his paper on " New Secondary Brachiopoda " ' Geological Magazine,' 

 vol. vi, December, 1869, it is quoted from the top of the Middle Lias, or Zone of Am. 

 spinatus (?), and in the zones of Am. jurensis and Am. opalinus of the Upper Lias. The 

 Rev. E. Smithe found the fossil in an earthy ferruginous band between two cephalopoda- 

 beds, reposing on the Am. jurensis zone, at Haresfield Beacon, in Gloucestershire. 



198. Rhynchonella ringens, Herault. Dav., Ool. Mon., p. 74, PI. XIV, figs. 



13—16 ; Sup., PI. XXVII, figs. 14, 

 15, 16. 



Rhynchonella ringens, Dav. Proc. of the Dorset Nat. Hist, and Antiquarian Field 



Club, pi. iv, figs. 17, 18, 1877. 



In England we find a small variety of this species. It has been collected by Mr. 

 Darell Stephens and Mr. J. F. Walker in considerable numbers in the Inferior Oolite at 

 Half-way House near Bradford Abbas, in Dorsetshire. There appears to be a consider- 



