﻿JURASSIC AND TRIASSIC BRACHIOPODA. 



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commencing under the extremity of the beak, and margined on either side by narrow 

 deltidial plates. Dorsal valve much less convex than the opposite one, and divided in 

 the middle by a rather deep sinus, five or six ribs occupying each side of the lateral 

 portions of the valve, while the whole surface of the shell or ribs are concentrically 

 crossed by numerous equidistant projecting lines of growth. Shell perforated by 

 numerous canals. In the interior of the smaller valve the hinge-plate is well-defined, 

 as well as the attachment to it of the riband-shaped lamellae forming the loop. A small 

 short septum extends also for a short distance along the bottom of the valve. Dimen- 

 sions variable ; a large example measured, length 3, width 6 lines. 



Obs. — Whatever may be the genus to which this species should belong, it will not, I 

 think, when better known, be retained either in Jrgiope, Megerlia, or Terebratula, 

 although it will no doubt find its place among the Terebratulidm. Its loop is not yet 

 known, and all my attempts, as well as those of Mr. E. Deslongchamps, to discover it have 

 hitherto failed. It will, however, there is little doubt, bear the same shape and character as 

 that of Terebratula (?) Suessi. In the fissure of the larger valve I perceived in a 

 specimen from Normandy, a large sunk flattened plate or pseudo-deltidium (fig. 2 a). 

 It differs at once from Tereb. (?) Suessi in having a fold and sinus ; it is also a 

 much larger and less spindle-shaped shell. Of this and the preceding species some 

 beautiful figures will be found in Deslongchamps' ' Jurassic Brachiopoda ' above 

 referred to. 



Position and Localitg. — This species was discovered for the first time by Dr. Perrier 

 in the Middle Lias of Fontaine-Etoupe-four, and May, near Caen, in Normandy. It is 

 not so abundant as T. Suessi. 



In England it was found by Mr. C. Moore in the Middle Lias of Whatley, near 

 Frome, in Somersetshire. 



79, Terebratula maxilliata, Sow. Dav., Ool. Mon., p. 50, PL IX, figs. 1 — 9. 



This species occurs plentifully in the Forest Marble, Bradford Clay, Great Ooolite, 

 and Cornbrash. There are, however, specimens in the Museum of the School of Mines 

 in London, stated to have been obtained from the Inferior Oolite, which cannot be 

 distinguished from the large examples from the Bradford Clay and Cornbrash. These 

 were found in a sandy limestone, about half a mile south of Great Ponton, near 

 Grantham, Lincolnshire. 



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