30 . CAMBRIAN BRACHIOPODA. • 



Present reference. 



Acrotreta attenuata var.? Walcott [1905a, p. 298] Acrotreta attenuata var.? 



Acrotreta babel Barrande [1879b, PI. XCV, figs, vii: 1-2] Acrotreta babel. 



Acrotreta baileyi Hall and Clarke [1892a, PL III, figs. 28-30] Acrotreta baileyi. 



Hall and Clarke [1892c, p. 102] Do. 



Matthew [1886, pp. 36-37] Do. 



Matthew [1902b, p. 395] Do. 



Matthew [1903, p. 97] Do. 



Walcott [1902, pp. 581-582] Do. 



Acrotreta baileyi ? Matthew [1892, p. 43] Acrotreta bisecta. 



Acrotreta bellatula Walcott [1908d, pp. 93-94] Acrotreta bellatula. 



Acrotreta bisecta Matthew [1901a, pp. 275-276] Acrotreta bisecta. 



Matthew [1902b, p. 394] Do. 



Matthew [1903, pp. 186-187] Do. 



Walcott [1902, p. 582] ' Do. 



Walcott [1905a, pp. 298-299] ' Do. 



Acrotreta? cancellata Walcott [1905a, p. 299] Acrotreta?? cancellata. 



Acrotreta carinata Moberg and Segerberg [1906, p. 66] Acrotreta carinata. 



(Acrotreta?) ceratopygarum [Discina], Brogger [1882, p. 47] .^ Acrothele ceratopygarum. 



Acrotreta circularis Moberg and Segerberg [1906, pp. 65-66] Acrotreta circularis. 



Acrotreta claytoni Walcott [1902, p. 583] Acrotreta claytoni. 



Acrotreta concentrica Walcott [1902, p. 583] Acrotreta concentrica. 



Acrotreta conula Walcott [1902, p . 584] Acrotreta conula. 



Acrotreta convexa Walcott [1902, p . 584] Acrotreta convexa. ' 



Acrotreta curvata Walcott [1902, p . 584] Acrotreta curvata. 



Acrotreta definita Walcott [1902, pp. 584-585] Acrotreta definita. 



Acrotreta depressa Walcott [1908c, p. 245] Acrotreta depressa. 



Acrotreta dichotoma Hall and Clarke [1892c, pp. 100 and 103] Acrothele dichotoma. 



Walcott [1886b, p. 107] Do. 



Acrotreta eggegrundensis Walcott [1905a, pp. 299-300] Acrotreta eggegrundensis. 



Wiman [1902, p. 55] Do. 



Acrotreta emmonsi Walcott [i905a, p. 300] Acrotreta emmonsi. 



Acrotreta gemma Billings [1865a, pp. 216-217] Acrotreta gemma. 



Grabau and Shimer [1907, p. 199] Acrotreta primseva. 



Hall and Clarke [1892c, p. 102, fig. 55] Acrotreta curvata. 



Hall and Clarke [1892c, p. 102, figs. 56 and 57] Acrotreta idahoensis alta. 



Walcott [1884b, pp. 17-18] ; Acrotreta attenuata (in part), A. pyxidi- 



cula (in part), A. curvata (in part), and 

 A. idahoensis alta (in part). The text 

 includes all four species, but the last two 

 were the only ones figured. 



Walcott [1884b, pp. 17-18, PI. I, figs, la-b] Acrotreta idahoensis alta. 



Walcott [1884b, pp. 17-18, PI. I, figs. Id-e] Acrotreta curvata. 



Walcott [1886b, pp. 98-99] Acrotreta attenuata (in part), A. pyxidi- 



cula (in part), and A. primaeva (in part). 

 The text includes all three species, but 

 the last was the only one figured. 



Walcott [1886b, pp. 98-99, PI. VIII, figs. 1, la-b] Acrotreta primseva. 



Walcott [1891a, p. 608] Acrotreta attenuata (in part), A. pyxidi- 



'cula (in part), A. curvata (in part), A. 

 idahoensis alta (in part), and A. pri- 

 maeva (in part). The text includes all 

 five species, but the last three were the 

 ■ only ones figured. 



Walcott [1891a, p. 608, PI. LXVII, figs. 5 and 5a] Acrotreta idahoensis alta. 



Walcott [1891a, p. 608, PI. LXVII, fig. 5b] Acrotreta curvata. 



Walcott [lS91a, p. 608, PI. LXVII, 5c-e] Acrotreta primaeva. 



Walcott [1899, p. 449] Acrotreta attenuata (in part), A. pyxidi- 



cula (in part), A. curvata (in part), A. 

 idahoensis alta (in part), and A. pri- 

 mseva (in part). The text includes all 

 five species, but the last three were the 

 only ones figured. 

 Walcott [1899, p. 449, PI. LXII, figs. 2, 2b, and 2d] Acrotreta primseva. 



