BRAOHIOPODA. 887 
Subgenus Camerothyris, Bittner. 1890. 
Shells with the contour and loop of Auzacoruyris, but having 
the dental plates convergent and united. 
(Type, Camerothyris Ramsauert, Suess (sp.). Trias.) 
Fias. 589-591. Camerothyris Ramsaueri, Suess (sp.) (BrITTNER.) 
(It is suggested by CEuuerr that the genus Orrnorpxa, Friren, 
1875, is based on young shells of Magellania numismalis, Lamarck. 
Lias.) 
Terebratalia, Beecher. 1893. 
Magellaniiform shells, having the adult loop of precisely simi- 
lar structure to that of TmermprareLya, but derived through a 
dissimilar series of metamorphoses, namely, through stages cor- 
responding successively with the adult condition in Pxati1a, 
Ismenta and Miuurecpria. 
Fias. 592-594. Terebratalia transversa, Sowerby (sp.). (DAVIDSON ) 
Type, Terebratalia transversa, Sowerby (sp.). 
Distribution. Recent (Arctic, Boreal, Japanese, Aleutian and 
Californian Provinces). 
Laqueus, Dall. 1870. 
Synonym; /renula, Dall, 1871. 
Shells differing from TrrepratTELya only in the structure of the 
loop, which bears two lateral processes, connecting the ascending 
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