. Cambrian Brachiopoda. Brachiopoda, Fossil. A A' FiGXJRE 59.—AcrothijTa minoT ACROTRETIDiE. 717 ACROTHYEA MINOR Walcott. Text figure 59; Plate LXXVI, figures 4, 4a-b. Acroihyra minor Walcott, 1905, Proc. U. S. Nat. Mus., vol. 28, p. 303. (Characterized as below as a new species.) This species differs from others referred to the genus by its broad form and very strong vascular sinuses. The elevated callus between the sinuses is liigh and oval ui outline, some- what like that of Acrotreta inflata (Matthew). It may be that this species belongs to a different genus, but -wdth the material availab
. Cambrian Brachiopoda. Brachiopoda, Fossil. A A' FiGXJRE 59.—AcrothijTa minoT ACROTRETIDiE. 717 ACROTHYEA MINOR Walcott. Text figure 59; Plate LXXVI, figures 4, 4a-b. Acroihyra minor Walcott, 1905, Proc. U. S. Nat. Mus., vol. 28, p. 303. (Characterized as below as a new species.) This species differs from others referred to the genus by its broad form and very strong vascular sinuses. The elevated callus between the sinuses is liigh and oval ui outline, some- what like that of Acrotreta inflata (Matthew). It may be that this species belongs to a different genus, but -wdth the material available for study it is referred to Acroihyra on account of its low overhanging false area and elongate visceral area. Formation and locality.—Middle Cambrian: (5b and 54s) o Dark blue-gray Langston limestone |l\'alcott, 1908f, p. 198], just above the Cambrian quartzitic sandstones, north side _ of Twomile Canyon, near its mouth, 2 miles ( km.) southeast of Malade, Oneida County, "'"wrieo'tt. "A',A'"Ex'terior Idaho. and side Adews of a ven- tral valve from Locality AcEOTHYRA PROAViA (Matthew). f*''.'"'?.* iTif/f ^ ' km.) southeast of Malade, Idaho (U. S. Nat. Mus. Plate LXXV, figure 3; Plate LXXVI, figures 3, 3a-u. Cat. No. 52051). Acrotreta proavia JIatthew, 1899. Bull. Nat. Hist. Soc. New Brunswick, vol. 4, pt. 3, No. 19, p. 203, PI. Ill, figs. 2a-f. (Described and discussed as a new species.) Acrothyra proavia prima Matthew, 1901, idem, vol. 4, pt. 4, No. 19, figs. 1-6, p. 303. (No mention of this species is made in the text, which is a description of the genus Acroihyra, but the variety is figured for the first time. The specimen represented by fig. 1 is redrawn in this monograph, PL LXXVI, fig. 3.) proavia AIatthew, 1902, idem, vol. 4, pt. 5, No. 20, pp. 386-388, PL XIV, figs. 2a-g and 3a-f. (Described and discussed. Figs. 2a-f are copied from Matthew, 1899, PL III, figs. 2a-f.) Acrothyra proavia prima Matthew, 1902, idem, p. 389, PL X
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