404 



MOLLUSCOIDEA 



PHYLUM V 



Propygope Bittner. Triassic ; Europe. 



Didyothyris Douvill^ (Fig. 601); Glossothyris Boxw'iWq (Fig. 602); Pseuclo- 

 r/lossothyris Buckman ; (1) Disculina Deslong. All from the European Jura. 

 Liothyrina CEhlert (LiotJujris Douville) (Fig. 603). Tertiary to Kecent. 

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

 Chlidonophora Dall. Deep-sea Terebratulinae. Recent. 



Subfamily D. Dyscoliinae Beecber. 



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

 (?) Cretaceous, Recent. 



Glossothyris nttcleata (Schloth.). 

 Upper Jura ; Bngelhardsberg, 

 Franconia. i/j. 



Fic. 601. 



Diclyolhyi-U coarctatu, (Park.). Great Oolite ; Bath, England. A-C, Three 

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



Fi(i. 603. 

 Liothyrina vitrea (liinn.). Recent ; Mediterranean, i/i- 



Fig. 604. 



Tereb-ratulina suh- 

 ftfriata (Schloth.). 

 Ujiper Jura ; Nat- 

 theim, Wurtem- 

 berg. Viv 



Dyscolia and Eucalathis Fischer and CEhlert. Recent. 



(?) A(julhasia King. Small Terebratulina-\ike shells with the ventral beak 

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



Division B. Terebratelloids. 



Terebratulacea with the loop supported by a median dorsal septum throughout 

 life, or only in the younger stages. Brachial cirri directed inwards during larval 

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

 separated in two provinces, one austral, the other boreal. 



Family 1. Terebratellidae King (emend. Beecher). 



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

 two secondary lamellae, passing through a series of distinct metamorphoses while 

 attached to a dorsal septum. Devonian to Recent. 



