119 

 BRACHIOPODA. 



DiNOBOLus. (Species indeterminable.) 



Upper beds, T. C. Weston, 1884 : a large but very imperfect single 

 valve, the maximum breadth of which is nearly two inches and a half. 

 Not a vestige of the umbo or beak, but only the anterior and least in- 

 structive half of the valve is preserved. 



Strophomena incurvata (?) Shepard. 



Producta incurvata, Shepard .... 18.38. Am. Journ. Sc. and Arts, vol. XXXIV. , p. 



144, figs. 1 and 2. 

 Orthin incurvata, Castelneau 1843. Essai sur le Syst. Silur. de I'Ameriq. Sep- 



tentr. , p. 38. 

 Strophomtna convexa, Owen 1844. Geol. Expl. Iowa, Wiscous. and 111., p. 70, 



pi. 17, fig. 2. 

 Leptcena'Jilitcxta, YiaW 1847. Pal. N. York, vol. I., p. 3, pi. 3lB, figs. 



3 a-/. 

 Strophomena Jilitexta, Billings .. 1 856. Canad. Nat. and Geologist, vol. I., p. 203, 



figs. 1 and 2. 

 ..1863. Geol. Canada, p. 164, fig. 142. 

 Strophomena incurvata(Shepa,rd), 



Winchell & Schuchert 1893. Lower Silur. Brach. Minn., p. 385, pi. 30, 



figs. .36-40. 



Lower beds, T. 0. Weston, 1884 : a specimen showing only the exterior 

 of the dorsal valve, so that according to Mr. Schuchert, by whom it has 

 been examined, it is doubtful whether it should be referred to this species, 

 or to iS. neghcta, James. 



Strophomena fluctuosa, Billings. 



StrophomejM fluctuosa, Billings 1860. Canad. Nat. and Geol. , vol. 



v., p. 57. 



1862. Geol. Surv. Canada, Pal. 



Foss., vol. I., p. 123, figs. 102, a-6. 



186.3. Geol. Canada, p. 209, fig. 207.' 



Hall 1892. Pal. N. York, vol. VIII., pt. 



1, p. 251, pi. UA, figs. 4 and 5. 

 ^' " Winchell & Schuchert.. 1893. Lower Silur. Brach. Minn. 



p. 395, pi. 31, figs. 14-17. 



Lower beds. Dr. R. W. Ells, 1875, a dorsal valve, showing the character- 

 istic shape and surface markings ; and T. C. Weston, 1884, a dorsal valve 

 with the inner surface exposed and showing all the characters of the 

 interior of that valve. 



