340 MOLLUSCOIDEA—BRACHIOPODA SUB-KINGDOM V 
Pomatospirella, Bittner. Small smooth shells having the contour of Dayia 
or Cyclospira. Alpine Trias. 
Kayseria, Davidson. Lenticular, plicated shells with a median plicated 
sinus on both valves. Jugum with a ventral articulating process and the 
bifurcations continued between the spiral ribbons to their outer ends. 
Deyonian ; Germany. 
Diplospirella, Bittner. Athyroids with the jugal processes coextensive 
with the principal spiral coils. Alpine Trias. 
Pexidella, Bittner. Athyroids differing from Diplospirella in that the 
jugum is much reduced and situated in the umbonal region. Valves much 
thickened in the apical region. Alpine Trias. 
Euractinella, Bittner. Diplospirelloids with short corresponding ribs. 
Alpine Trias. 
Anisactinella, Bittner. Diplospirelloids with alternating ribs. The 
secondary spiral coils give off a process which returns and joins the jugum. 
Alpine Trias. 
Koninckina, Suess (Fig. 584).-. Shell sub-orbicular, concavo-conyex, smooth, 
with a straight hinge-line, or Strophomenoid in external appearance. Car- 

Fic. 586. 
Fic. 584. Fic. 583 Thecospira Haidingeri, Suess sp. 
Koninckina Leonhardi, Wissm.  sp.. eS Dee) Rhaetic; Starhemberg, Austria. 
Upper Trias ; St. Cassian, Tyrol. <A, Shell Amphiclina, with re- A, Ventral valve, 4/;. B, C, 
showing spiralia, enlarged. B, Ventral stored brachidia (after Brachidia, enlarged (after Zug- 
and dorsal aspects, 1/1. Bittner). meyer). 
dinal area obsolete at maturity. The accessory spirals take their origin 
from the upper surface of the jugum, and are coextensive with the primary 
spirals. Trias; Europe. 
Amphiclina, Laube (Fig. 585). Like Koninckina, but sub-trigonal in out- 
line, and with well-developed cardinal area and deltidial plates. Trias and 
Jura; Europe. 
Koninckella, Munier-Chalmas. Similar to <Amphiclina, but with well- 
developed cardinal process. Trias and Jura; Europe. 
Amphiclinodonta, Bittner. Like Amphiclina, but with interlocking denti- 
culate ridges and tubercles within the margins of the valves. Alpine Trias. 
Koninckodonta, Bittner. Like Koninckina, but with prominent cardinal 
areas and a row of sub-marginal thickened tubercles on the interior of the 
ventral valve, which interlock with similar callosities on the dorsal valve. 
Alpine Trias. 
Thecospira, Zugmayer (Fig. 586). Ventrally cemented Koninckinae with 
well-developed cardinal area and cardinal process. Alpine Trias. 
