314 D. K. Greger — New Devonian Brachiopod. 



Crancena morsii sp. nov. Shell large for the genus, sub- 

 circular, valves nearly equally and uniformly convex. Margi- 

 nal line along the lateral and anterior juncture of the valves, 

 forming a sharp, thin edge. No defined fold or sinus. Sur- 

 face covered with very faint, even concentric lines of growth ; 

 otherwise the surface is smooth. Shell structure abundantly 

 punctate, the punctae very minute and arranged as in the 

 related Crancena iowensis (Calvin). 



Brachial valve similar in degree of convexity to the opposite 

 valve, slightly ridged from beak to near the center. Beak 

 obtuse and but slightly incurved. 



Pedicle valve regularly convex, most prominent near the 

 center, sloping gently to the front and sides. Beak elevated, 

 slightly incurved and truncated by a circular foramen. Del- 

 tidial plates conspicuous. A slight auriculation in the poste- 

 rio-lateral region gives a shouldered appearance to some 

 individuals, but it is not a constant character. 



Brachial valve similar in degree of convexity to the opposite 

 valve, slightly ridged from beak to near the center. Beak 

 obtuse and but slightly incurved. 



Measurements : The average of a number of mature indi- 

 viduals give the following : Length, 42 millimeters ; breadth 

 40 millimeters ; thickness, 17 millimeters. 



Found near the base of the Snyder Creek shale associated 

 with Atrypa reticularis, Spirifer amarus, Schizophoria mac- 

 farlani, Strophonella crassa, Stropheodonta infiexa, Stroph- 

 eodonta Jcemperi, Schuchertella pandora, and Productella 

 marquessi. With the exception of Atrypa reticularis, Spiri- 

 fer amarus and Productella marquessi, the species here listed 

 appear to be confined to the first twenty inches of dark shale 

 resting directly upon the Callaway Limestone. 



Locality: Snyder Creek, six miles south of Fulton, Calla- 

 way County, Missouri. Our shell differs from Crancena 

 iowensis, its near congener, in being a constantly larger and 

 more circular species. The retention of the original color 

 markings — some individuals retaining them in a most perfect 

 ■condition — gives to the species a special interest. 



It is with keen pleasure that we dedicate this interesting 

 brachiopod to Professor Edward S. Morse of Salem, Mass., a 

 student of the Brachiopoda, who with acute perception and 

 artistic hand has added so much to our knowledge of the 

 embryology and development of the Class. 



Westminster College Museum, Fulton, Missouri. 



