﻿CRETACEOUS BRACHIOPODA. 



70. Rhynchonella plicatilis, Sow. Dav., Cret. Mon., PI. X, figs. 37 — 42. 



Var. octoplicata. PI. X, figs. 1 — 17. 

 Var. Woodwardi. PI. X, figs. 43 — 46. 



Mr. Tate informs me that Bh. lentiformis (Woodward), ' C. M.,' PI. XII, figs. 4, 5 r 

 which he (Tate) has catalogued as a variety of Bh. limbata (Quart. Journ. Geol. Soc, 

 vol. xxii, p. 30) appears to be the young of Bh. octoplicata, and that both occur in the 

 Upper Chalk of the County of Antrim, in Ireland. 



71. Rhynchonella limbata, Schloth. Dav., Cret. Mon., PI. XII, figs. 1 — 5, Upper 



Chalk. 



Var. robusta, Tate. Sup., PI. VII, figs. 18, 18a. 



Rhynchonella limbata, var. kobusta, Tate. Quarterly Journal Geol. Soc, vol. xxi, 



p. 42, pi. v, fig. 2, 1865. 



Mr. Tate observes that this well marked variety of Bh. limbata is very distinct on 

 account of the exceeding gibbosity of the shell. It is very common in the Upper 

 Greensand or Hibernian Greensand (' Zone of Inoceramiis Crispi ' of R. Tate) at Woodburn, 

 near Carrickfergus (Country Antrim), Whitehead, and Island Magee. It was also found 

 by Mr. Judd in the same Zone at Waterloo, near Larne. It may be noted that, although 

 possessing the general aspect of Bhyn. limbata, all the specimens I have been able to 

 examine were so much more circular and gibbous than Bh. limbata as occurring in the 

 Upper Chalk, that it might perhaps constitute a separate species under the designation of 

 Bh. robusta, Tate. This species (or variety of B. limbata) seems to be restricted to the 

 Upper Greensand, while Bh. limbata proper occurs (even in Ireland) in the White or 

 Upper Chalk. 



72. Rhynchonella Martini, Mantell. Dav., Cret. Mon., PI. XII, figs. 15, 16. 

 Specimens from the Chalk-marl of Watlington, Oxon ; and Grey Chalk of Dover. 



73. Rhynchonella Grasiana, cVOrb. Dav., Cret. Mon., PI, XII, figs. 17, 19. 



Specimens from Folkstone, the Upper Greensand of Warminster, Brauscombe, and the 



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