﻿CRETACEOUS BRACHIOPODA. 



59 



shown by Mr. Meyer and others, are referable to the age of the Lower Greensand, 

 and not to that of the Upper Greensand, as I had formerly erroneously supposed the 

 Sponge-gravel at Earingdon to belong. Mr. Meyer is of opinion that Sowerby's 

 Bh. depressa is quite distinct from any forms that occur in the Upper Greensand of 

 Warminster, and, if this view be correct, the shells I figured in PL XII, figs. 28, 29, 

 30, should be referred to another species. 



Sowerby's Bh. depressa has, both on the Continent and in this country, been made 

 a convenient receptacle for several forms that could not be clearly distinguished ; 

 hence much confusion has arisen, which it will be no easy matter to dispel. 



A large variety of Sowerby's species (figs. 24, 25), very variable in shape, occurs 

 abundantly in the Lower Greensand at Upware ; and, indeed, in this locality the greater 

 number of forms, which occur likewise at Earingdon, have attained larger proportions, 

 together with a strong varietal aspect. Bh. depressa is stated by Mr. Meyer to be 

 found also at Godalming. 



78. Rhynchonella Schloenbachi. Dav., Cret. Mon., PL XII, figs. 28, 29, 30. 



Rhynchonella depressa, varr. A & B, Dav. Cret. Mon., pi. xii, figs. 28 — 30. 



At pages 91 and 92 of my Monograph, I stated that the specimens figs. 28, 29, and 

 30, " appear to constitute (if not a separate species) well-marked varieties of Bh. depressa 

 of Faringclon ; " consequently I described them under the head of " Varieties A " and 

 " B." Since then I have had the opportunity of examining a great number of specimens 

 from the Upper Greensand near Belfast, where the shell occurs in the " Zone of Exogyra 

 columba ; " also from Vivortier, in the Dept. de l'Orne ; and I am now disposed to agree 

 with Mr. Meyer that this shell can be specifically distinguished from the true Bh. 

 depressa as occuring in the Lower Greensand of Earingdon. 



The variety "A," with fewer and larger ribs (fig. 30), and the variety " B, J ' with smaller 

 and more numerous ones (figs. 28, 29), seem to graduate one into the other. Perhaps 

 Schloenbach's Bhynch. sigma may be a modification of the shell under description. 



Position and Locality. In addition to Chardstock, Mr. Meyer has found this species 

 in the Upper Greensand of Niton, Isle of Wight ; Pinhay CJifT, near Lyme Regis ; at 

 the base of Upper Greensand, near Beer Head ; and in Chloritic Marl at Dunscombe. 



79. Rhynchonella lineolata, Phillips. Dav., Cret. Mon., PL XII, fig. 6. 



Of this species, as found in the Speeton Clay (Neocomian) of Knapton, in Yorkshire, 



