ORDER IV 



TELOTREMATA 



329 



'i, Waagen. Plicated Dielasmas without dental plates. 

 Carboniferous to Permian ; India. 



Xntntlun-h, Waagen. Carboniferous; India Terebratulina, d'Orbigny^ 

 (Fig. 550). Jura to Recent. Distribution general. 



Terebratula, Klein, 1753 (Fig. 551). Genus not well known. Mesozoic or 

 Tertiary. 



Liothyrina, Oehlert (Liothyris, Douville), (Fig. 552). Tertiary to Recent. 



FIG. 554. 



nictutlnii-'i* r.xirctata, Park sp. Great Oolite; Bath, England. A-C, 

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



PIG. 555. 



Glossothyris nucleata, Schloth. 

 sp. Upper Jura; 

 Franconia. J /i- 



Pygope, Link (DiphyUes,Schroter', Pugites, de Hann; Antinomia, Catullo), (Fig. 

 553). Shell originally bilobed, the two lobes often uniting anteriorly in 

 adult specimens, but leaving posteriorly a median hollow space passing 

 through the shell. Jura ; Europe. 



Dictyothyris, Douville (Fig. 554); Glossothyris, Douville (Fig. 555); 

 (?) Disculina, Deslong. All from the European Jura. 



Zui/nieyeria and Pthaetina, Waagen ; and Propygope, Bittner. Trias ; Europe. 



Sub-Family D. DISCOLIINAE. Beecher. 



Terelmtulidae with the loop short ami no coiled median arm. (?) Cretaceous, 

 Recent. 



Discolia and Eucalathis, Fischer and Oehlert. Recent. 

 ? Agulhasia, King. Small Terebratulika-likQ. shells with the ventral beak 

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



(SECTION B.) TEREBRATELLA. 



Terelratulacea with the loop s//yy/ W />// 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). 



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

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

 attached to a dorsal septum. Devonian to Recent. 



