820 Report or THE STATE GEOLOGIST. 
Amphiclina, Laube. 1885. 
Shell concavo-convex, subtrigonal, with straight hinge-line, 
well-developed cardinal and deltidial plates. Spirals duplicate, 
the two pairs being coextensive. 
Yor 
Fias. 404-406. Amphiclina dubia, Miinster (sp ). 
(Fia. 405, Brrrner; Fias. 404, 406, BEECHER.) 
Type, Amphiclina dubia, Miinster (sp.). 
Distribution. Triassic. 
Koninckella, Munier-Chalmas. 1880. 
Shell concavo-convex, smooth. Hinge-line straight, cardinal 
area, deltidial plates and cardinal process well developed. 
Spirals duplicate, jugum probably as in Konryoxina. The 
Fies. 407-409. Koninckella triadica, Bittner. 
(BITTNER. ) 
volutions of the spiral cones are few, and the ribbon of the 
primary coils bear long marginal spinules. 
Type, Koninckella liasina, Bouchard-Chantereaux (sp.). 
Distribution. Lias. 
Koninckodonta, Bittner. 1893. 
Shell as in Konrycxina but with well-developed cardinal area 
and deltaria. On the interior of the pedicle-valve is a submarginal 
row of thickened tubercles which interlock with similar callosities 
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