﻿TERTIARY BRACHIOPODA. 



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2. Lingula Dumortieri, Nyst. Dav., Tert. Mon., PI. I, figs. 10, 11; Supplement, 



PI. II, fig. 9. 



Lingula Dumortieri, S. Wood. Sup. to Crag Mollusca, Pal. Soc, p. 172, pi. xi, 



figs. 1, 1 a, 6, c, 1874. 



No complete example of this species has been hitherto found in Great Britain ; and 

 scarcely ever even in Belgium, where the shell is not quite as rare. Some specimens 

 from the Grey and Yellow Crag, or " Etage Scaldisien," at Stenyvenberg, in the neighbour- 

 hood of Antwerp, have measured one inch and a quarter in length, by a little more than 

 half an inch in breadth. 



Mr. Jeffreys is of opinion that this Lingula cannot be specifically distinguished from 

 the Lingula jaspiclea of A. Adams, dredged in seven fathoms at Mososeki, in Japan ; 

 but, as only one small example of the recent form could be examined, this supposed 

 identification must for the present remain an open question. 



Lingula Dumortieri, when in life, presented, there can be but little doubt, a bright 

 brownish or somewhat coppery colour, such as is seen in L. jaspidea and in a larger 

 form of the same genus which occurs in the Bay of Jeddo, Japan. 



Position and Localities. — Coralline Crag, Sutton and near Orford. 



3. Discina fallens, S. Wood. Dav., Tert. Mon., PI. I, fig. 9. 



Discina Norvegica? <S. Wood. Ann. and Mag. Nat. Hist., p. 253, 1840. 

 Okbicula lamellosa? Dav. Tert. Mon., pi. i, fig. 9 (not of Broderip), 1852. 

 Crania Atlantica, Bell. Proc. Geol. Association, vol. ii, p. 206, 18/2 (not 



Discina Atlantica, King). 

 Discina fallens, S. Wood. Sup. to the Crag Mollusca, p. 172, pi. xi, fig. G, 1874. 



Two small examples only were found by Mr. S. Wood. The specimen described by 

 myself in 1852 is in the British Museum, and was carefully examined and compared 

 with Discina Atlantica by Prof. W. King, in 1867, who states, in the Proceedings of the 

 Natural History Society of Dublin, January 2, 1S68, " At one time I entertained a 

 suspicion that the shell herein described (D. Atlantica) might turn out to be specifically 

 identical with the Crag specimen ; but having lately examined the latter in the British 

 Museum, I find that the present species (D. Atlantica) has a more circular form, seemingly 

 finer lines of growth, also more elevated and less excentrically situated apex." It is certainly 

 not a Crania, as suggested by Mr. Bell in his paper on the English Crags. Mr. Wood's 

 second example is larger than the one figured in my Monograph. It is three lines in 

 length by two and a half in breadth. Mr. Wood has proposed the specific name of 

 fallens for the Crag species, which I willingly adopt. 



