﻿CRETACEOUS BRACHIOPODA. 



33 



Dr. Schloenbach has justly reminded us that this species was correctly described 

 and figured by Roemer in 1841 under the designation of Tereb. arcuata ; his name must, 

 therefore, be adopted. 



32. Terebratula squamosa, Mantett. Dav., Cret. Mon., PI. V, figs. 5 — 11 ; Sup., 



PI. II, fig. 15. 



The loop is short and simple. Specimens have been found by Mr. Meyer in the 

 Chalk-marl of Folkestone and the Chloritic Marl of Pinney Cliff, near Lyme Regis. 



33. Terebratula capillata, If Arch. Dav., Cret. Mon., PI. V, fig. 12 ; Sup., PI. VII, 



figs. 2, 2a — c. 



Three specimens of this species have been found by Mr. Keeping in the Lower 

 Greensand at Upware, and are deposited in the fine collection of fossils, from that 

 locality, in the Woodwardian Museum, Cambridge. These specimens agree more closely 

 with those from the Tourtia of Belgium than do those that occur in the Red Chalk of 

 Hunstanton. The last are more ovate and convex than the Belgian specimens, and 

 also much larger. It may possibly be necessary to consider the " Red Chalk " shell as 

 a distinct species or variety. The external sculpture in the specimens from the Red 

 Chalk, the Lower Greensand, and the Tourtia is, however, exactly the same, and as many 

 as twenty of the characteristic small ribs may be counted in the width of two lines. We 

 are not acquainted with the apophysary arrangements in this species. 



34. Terebratula biplicata, Sowerby. Dav., Cret. Mon., PI. VI, figs. 1 — 42 only ; 



Sup., PI. V, figs. 1, 2. 



Much confusion seems to prevail with reference to the biplicated species of 

 Terebratula that occur in the Tertiary, Cretaceous, and Jurassic formations, and, 

 indeed, one scarcely knows how to deal with species so variable, and at the same time 

 bearing, in many cases, so much general outward resemblance as to render their 

 separation into distinct, well-characterised species a matter of no small difficulty and 

 uncertainty. Palaeontologists are now very generally of opinion that the term biplicata 

 should be retained exclusively for the shell described and figured by Sowerby 

 (tab. 437, figs. 2, 3, and 4), and that Brocchi's designation maybe entirely dispensed 

 with. 1 



1 In 1860 Messrs. Saeman and Triger visited the Museum of Milan, where Brocchi's collection is 

 preserved, and carefully examined the specimen to which the Italian palaeontologist had, in 1814, given 



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