404 



MOLLUSCOIDEA 



THYLUM V 



Fropygope Bittner. Triassic ; Europe. 



Didyothyris Douvillö (Fig. 601); Glossotky r is IdoviYiWii (Fig. 602); Pseudo- 

 glossothyris Buckman ; (?) DiscuUna Deslong. All from the European Jura. 

 Liothyrina Q^hlert (Liothyris Douville) (Fig. 603). Tertiary to Recent. 

 Terebratulina d'Orb. (Fig. 604). Jurassic to Recent ; distribution general. 

 Chlidonophora Dali. Deep-sea Terebratulinae. Recent. 



Subfamily D. Dyscoliinae Beecher. 



Post-Paleozoic Terebratulidae with the loop short and no coiled median arm. 

 (?) Cretaceous, Recent. 



B C 



Fig. 602. 



Glossotliyris nucleata (Schloth.). 

 Upper Jura ; Bngelhardsberg, 

 Franconia. i/j. 



Didyothyris coarctata (Park.). Great Oolite ; Bath, England. A-C, Tliree 

 Views of the natural size. D, Portion of outer surface, enlarged. 



Fig. 603. 

 Liothyrina vitrea (Linn.). Recent ; Mediterranean. i/^. 



Fig. 604. 



Terebratulina suh- 

 striata (Schloth,). 

 Upper Jura ; Nat- 

 theim, Würtem- 

 berg. Vi- 



Dyscolia and Eucalathis Fischer and (Ehlert. Recent. 

 (?) Ägulhasia King. Small TerehratuUna-like shells with the ventral beak 

 greatly elevated and a triangulär false cardinal area. Cretaceous to Recent. 



Division B. Terebratelloids. 



Terebraiulacea with the loop supported hy a 



dorsal septum throughout 

 life, or only in the younger stages. Brachial cirri direded inwards during larml 

 This section has two phyla having a common origin, now geographically 

 ' in two provinces, one austrat, the other horeal. 



Family 1. Terebratellidae King (emend. Beecher). 



Terebratelloids with the loop in the higher genera composed of two primary and 

 two secondary lamellae, passing through a series of distind metamorphoses white 

 attached to a dorsal septum. Devonian to Recent. 



