ORDER IV TELOTREMATA 329 
Hemiptychina, Waagen.  Plicated Dielasmas without dental plates. 
Carboniferous to Permian ; India. 
Notothyris, Waagen. Carboniferous; India. Terebratulina, dOrbigny 
(Fig. 550). Jura to Recent. Distribution general. 
Terebratula, Klein, 1753 (Fig. 551). Genus not well known. Mesozoic or 
Tertiary. 
Liothyrina, Oehlert (Liothyris, Douvillé), (Fig. 552). Tertiary to Recent. 

Fia. 555. 
Fig. 554. 
Glossothyris nucleata, Schloth. 
Dictyothyris courctata, Park sp. Great Oolite; Bath, England. A-C, sp. Upper Jura; Engelhardsberg, 
Three views of the natural size. D, Portion of outer surface, enlarged. Franconia. 1/;. 
Pygope, Link (Diphyites,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, Douvillé (Fig. 554); Glossothyris, Douvillé (Fig. 555) ; 
(2) Diseulina, Deslong. All from the European Jura. 
Augmeyeria and Rhaetina, Waagen ; and Propygope, Bittner. Trias ; Europe. 
Sub-Family D. Discotmnar. Beecher. 
Terebratulidae with the loop short and no coiled median arm. (1?) Cretaceous, 
Recent. 
Discolia and Eucalathis, Fischer and Oehlert. Recent. 
1 Agulhasia, King. Small Terebratulina-like shells with the ventral beak 
greatly elevated and a triangular false cardinal area. Cretaceous to Recent. 
(SECTION B.) TEREBRATELLA. 
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. 
x 
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. 
