328 MOLLUSCOIDEA—BRACHIOPODA SUB-KINGDOM V 
Harttina, Hall and Clarke. — Centronellaike shells with a high dorsal 
median septum and the descending branches of the loop laterally fringed with 
irregularly set spinules. Carboniferous ; North America and Brazil. 
? Cryptacanthia, White and St. John. Upper Carboniferous; North 
America. 
Sub-Family C. TEREBRATULINAE. Dall. 
Terebratulidae with a short loop. A median unpaired coiled arm exists in recent 
genera. Devonian to Recent. 
Of this large sub-family only a few of the more important genera can be briefly 
considered here. 
Dielasma, King (Epithyris, King), (Fig. 549). To the divergent crural 
plates is attached a shallow, often quite long, anteriorly acuminate hinge- 

Fig. 550. 
Fic, 549. Terebratulina sub- Fic. 551 
Dielasma elongata, Schloth. sp. Permian ; Hum- striata, Schloth. sp. peso 
bleton, England. A, Dorsal and anterior views, Upper Jura; Nat- Terebratula Phillipsi, 
1/;. B, Interior of conjoined valves, greatly en- theim, | Wurtem- Morris. Middle Jura; Egg, 
larged (after Davidson). berg. 1/3. near Aarau, Switzerland. 1/;. 
plate carrying the muscles of the dorsal valve. Devonian to Permian ; 
Europe, India, and America. 
Bunella and Cranaena, Hall and Clarke. Dielasmas without the adherent 
myiferous hinge-plate. Devonian; North 
America. 
Beecheria, Hall and Clarke. Smooth-shelled 
Dielasmas without dental plates, but with the 


NS 
np 
= =z aL LN fat 

Fic. 553. 
: Pygope diphya, Colonna. Tithonian; 
Liothyrina vitrea, Linn. sp. Recent; Mediterranean, 1/3. Trent, Tyrol. 1/;. 
Fig. 552. 
’ 
myiferous plate wholly attached to the dorsal valve. Carboniferous ; North 
America and India. 
Diclasmina, Waagen. Plicated Dielasmas. Carboniferous ; India. 
