BRACHIOPODA. 889 
Terébratella, @Orbigny. 1847. 
Synonym; Waltonia, Davidson, 1850. 
Shells biconvex, oval; surface plicate, rarely smooth. Cardinal 
area more or less distinctly defined on the pedicle-valve ; foramen 
large, deltidial plates usually not united at maturity. Dental plates 
and sometimes a faint median septum are present. Brachial valve 
Fias. 601, 602. Terebratella dorsata, Gmelin (sp.); showing the mature and an immature 
condition :f the loop. (Dayipson.) 
with prominent cardinal process and divided hinge-plate. Loop 
long and recurved, the descending processes joined with the median 
septum by a pair of lateral lamella passing obliquely backwards. 
Type, Terebratella dorsata,* Gmelin (sp.). 
Distribution. Jurassic — Recent (Australo Zealandian, Cali- 
fornian, Peruvian and Magellanian Provinces). 
Kingena, Davidson. 1852. 
Synonym; Avngia, Schloenbach, 1867. 
Shell subglobose, smooth or tuberculated. Foramen circular, 
deltidial plates rudimentary. Pedicle-valve with dental plates; 
Fies, 603, 604. Kingena lima, Defrance (sp.). CWoopwARD.) 
brachial valve with broad cardinal process and a median septum. 
Loop long, recurved, as in TeReBRaTELLA, but with the dorsal band ~ 
* On pp..15, 17 and 76 this species is erroneously referred to as Terebratalia dorsata. 
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