332 MOLLUSCOIDEA—BRACHIOPODA SUB-KINGDOM V 
Trigonosemus, Koenig (Fissurirostra, Fissirostra, @’Orb. ; Delthyridea, King), 
(Fig. 562). Cretaceous ; Europe. 
Mierothyris, Deslongchamps (Ornithella, Deslong.), (Fig. 563). Jura. 
Zeilleria, Bayle, seems to differ only in 
having a biplicate dorsal valve. Europe. 
Aulacothyris, Douvillé (Fig. 564). 
Trias to Cretaceous; Europe. Ludesia, 







Fic. 563 Fic. 564. 
Microthyris lagenalis, Schloth. sp. Corn- Aulacothyris resupinata, Sow. sp. Middle Lias ; ‘Tl- 
hbiash ; Rushden, England. 1/; (after Davidson). minster, England (after Deslongchamps). 
King (Orthotoma, Trigonella, Quenstedt ; Flabellothyris, Deslong.) Jura; Europe. 
Fimbriothyris and Epicyrta, Deslong. Jura. Camerothyris, Bittner. Trias. 
Cincta, Quenstedt. Jura. <Antiptychina, Zittel. Jura. Plesiothyris, Douvilleé. 
Jura; Europe. 
? Hynniphoria, Suess ; ? Cruratula, Bittner ; ? Orthoidea, Friren. 
Sub-Family D. MaGELLAntnar. Beecher. 
Terebratellidae with the loop composed of descending and ascending branches, passing 

Fic, 565. 
Pp 
Magas pumilus, Sow. White Fig. 566. 
Chalk ; Mendon, near Paris. 4, B, Coenothyris vulgaris, Schloth. sp.  Muschelkalk; Wiirzburg. 
Shell, 1/3. ©, Vertical section. A, Dorsal and anterior views,1/;. LB, Loop enlarged and restored 
D, Interior of dorsal valve. from sections treated with acid (partly after Koschinsky). 
in the higher genera through metamorphoses comparable to the adult structure of Bou- 
