THE BRITISH FOSSIL BRACHIOPODA. 



353 



correctly classed in the Sip/ionotretida. Dall admits the genus Mesotreta, Kutorga, 

 ' Verh. Kais. Min. Ges. St.-Petersburg,' 1847, type M. (Siphonotreta) tentorium, Kut.> 

 as a distinct genus among the Siphonotretida. 



The Trimerellidce are a well-characterised family (see Dav. and King " On the 

 Trimerellidae, a Palaeozoic Family of Brachiopoda/' ' Quarterly Journal of the Geological 

 Society of London,' vol. xxx, page 124, &c, 1874). The Trimerellids we observed to be 

 closely related to the Lingulids, but distinct as a family. In that paper we described 

 seven species of Trimerella, four of Monomer etta, and seven of Dinodolus, and alluded to all 

 the localities where these fossils had been discovered. Since then, however, another 

 species of Monomerella has been found by Prof. F. Schmidt at Werden in Russia, and a 

 small form of Trimerella at Larsholm in the same empire. Mr. Whiteaves has also 

 described a new fine Dinobolus, D. ovatus, from Durham, Ontario, in Canada. 



Arthropomata, Owen =Clistenterata, 



King. 













Sub-Families and Genera. 



Palaeozoic. 



Mesozoic. 



Cainozoic. 



3 



6 



a 



B 





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 5 



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I. Family Tee 



1. Sub-FamilyTE-REBRATVLi'Dm. 

 Loop simple, varying in length, 



attached to the hinge-plate of ' 

 dorsal valve. 



2. Sub-Family Centbonellin.e. " 

 Loop long, composed of two 



ribbon-shaped lamellae with 

 crura ; the lamellae uniting at 

 their anterior extremities, and 

 a more or less developed verti- 

 cal lamella rises between. 



S.Sub-FamilyTER^BnATELLll>x. "1 



EBEATULACEA. 



" Dielasma, King, 1859 



Terebratula, Klein, 1753 



Terebratulina, d' Orbigny, 1847 

 ? Hemiptychina, Waagen, 1883 

 Loenothysis, Douville, 1880 . . . 



Waldheimia, King, 1850 



Terebrirostra, d'Orb., 1847 ... 



_ Megauthyris, Suess, 1856 



Centronella, Billings, 1859 ... 



• Renssellaeria, Hall, 1859 



? Leptoccelia, Sail, 1857 



Terebratella, d' Orbiqny, 1847 



























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1 





















Loop twice attached, to hinge- L ? Magasella, Dall, 1870 



plate and to a median septum. J Trigonosemus, Koenig, 1825. . . 



4. Sub-Family Megeblidj;. 1 Megerlia, King, 1850 



Loop three times attached ; I Kingina, Dav., 1852 



lateral lobes closed. J Laqueus, Dall, 1870 



5. Sub-Family Maqasivm. ") Magas, Sow., 1816 



An anchor-shaped lamella at- L Bouchardia, Dav., 1849 



tached to a mesial septum. f Khynchora, Dal man, 1828 ... 

 J ? Mannia, Dewalque, 1874 ... 



6. Sub-Family Kbaussid^:. ~] 

 No loop ; interior of dorsal valve | 



furnished with a forked pro- )■ Kraussina, Dav., 1859 



cess rising nearly centrically j 

 from the bottom. J 





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