332 



MOLLUSCOIDEA BRACHIOPODA 



SUB-KINGDOM V 



Trigonosemus, Koenig (Fissurirostra, Fissirostra, d'Orb. ; Delthyridea, King), 

 (Fig. 562). Cretaceous; Europe. 



Microthyris, Deslongchamps (Ornithella, Deslong.), (Fig. 563). Jura. 



Zeilleria, Bayle, seems to diifer only in 

 having a biplicate dorsal valve. Europe. 

 Aulacothyris, Douville" (Fig. 564). 

 Trias to Cretaceous ; Europe. Eudesia, 





FIG. 503 



Micrathyrls lagennlis, Schloth. sp. Corn- 

 biasli ; Rushden, England. J/l (after Davidson). 



FIG. 564. 



Aulacothyris resupinata, Sow. sp. Middle Lias; II- 

 inster, England (after Deslongchamps). 



King (Orthotoma, Trigonella, Quenstedt ; FlaMlothyris, Deslong.) Jura ; Europe. 



Fimbriothyris and Epicyrta, Deslong. Jura. Camerothyris, Bittner. Trias. 

 Cincta, Quenstedt. Jura. Antiptychina, Zittel. Jura. Plesiothyris, Douville. 

 Jura ; Europe. 



? Hynniphoria, Suess ; 1 Cruratula, Bittner ; 1 Orthoidea, Friren. 



Sub-Family D. MAGELLAXINAE. Beecher. 

 Terebratellidae with the loop composed of descending and ascending branches, passing 



FIG. 565. 



Mm/us pumilus, Sow. \Vhite 

 Chalk ; Mention, near Parts. A, B, 

 Shell, i/!. C, Vertical section. 

 D, Interior of dorsal valve. 



FIG. 566. 



Coenothyris vulgaris, Schloth. sp. Muschelkalk ; Wiirzbnrg. 

 A, Dorsal and anterior views, 1 /!. B, Loop enlarged and restored 

 from sections treated with acid (partly after Koschiusky). 



in the higher genera through metamorphoses comparable to the adult structure of Bou- 



