BRACHIOPODS. 45 





 Productus longispinus SOWERBY. 



Plate xxxvii, fig. 4a-b. 

 Productus longispinus Sowerby, 1814 : Min. Conch., vol. I, p. 154, pi. Ixviii, 



fig- 1. 

 Productus splendens Norwood & Fratten, 1854: Jour. Acad. Nat. Sci., 



Phila , (2), vol. II, p. 2, pi. i, figa. 5a-d. 

 Productus wabashensis Norwood & Pratten, 1854: Jour. Acad. Nat. Sci., 



Paili., (2), vol. Ill, p. 13, pi. i, fig. 6. 

 Productus muricatus Norwood & Pratten, 1854: Jour. Acad. Nat. Sci., 



Phila., (2), vol. Ill, p. 14, pi. i, figs. 8a-e. (Not Phillips.) 

 Productus muricatus Cox, 1857: Geol. Sur. Kentucky, vol. Ill, p. 573, pi. 



ix, fig. 6. 

 Productus costatoides Swallow, 1858: Trans. St. Louis Acad. Sci., vol. I, 



p. 217. 

 Productus orbignyanus Geinitz, 1866: Carb. und Dyas in Nebraska, p. 56, 



tab. iv, figs. 8, 9, 10, 11. (Sot deKoninck, 1844 ) 

 Productus horridus Geinitz, 1866 : Carb. und Dyas in Nebraska, p. 56, 



tab. iv, fig. 7. ( Not Sowerby, 1822.) 

 Productus longispinus Meek, 1872: U. S. Geol. Sur. Nebraska, p. 161, pi. 



vi, fig. 7, pi. viii, figs. 6a-c. 

 Productus muricatus White, 1875: U. S. Geol. Sur. W. 100 Merid., vol. 



IV, p. 120, pi. viii, fig. 4i-c. 

 Productus longispinus Meek, 1877: Geol. Exp. 40 Par., vol. IV, p. 78, pi. 



viii, figs. 4-4a. 

 Productus muricatus Keyes, 1888 : Proc. Acad. Nat. Sci. , Phila., p. 228. 



Shell small, thin, somewhat wider than long; hinge-line 

 longer than greatest width of shell. Ventral valve arched, 

 with greatest convexity behind middle ; mesial sinus well de- 

 fined, broadly rounding; beak small, incurved, projecting be- 

 yond the hinge-line. Ventral valve concave, following closely 

 the curve of the opposite one. Surface marked by obscure 

 radiating cost*, which often become obsolete over nearly the 

 entire shell ; these are often crossed by distinct concentric 

 folds, which are more pronounced toward the beak ; spines 

 few, scattered. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



There seems to be but little doubt now that Norwood & 

 Pratten's species P. splendens and P. wabashensis are identical 

 with the form under consideration. In regard to certain other 

 allied shells reported by Geinitz from Nebraska, and their re- 

 lations to P. longispinus, Meek says: "Concerning the iden- 



