318 



PALEONTOLOGY OF ILLINOIS. 



MOLLUSCA. 



BRACHIOPODA. 



GENUS GAMBKOPHOKIA, King. 



a, 



JCAMEROPHORIA GiFFORDi, Worthen. 



La, View of dorsal valve; b, ventral valve; c, profile view.] 

 Camerophoria Giffordi, WOBTHEN, February, 1882. 

 Bulletin No. 1, of the Illinois State Museum of Natural History, p. 39. 



Shell above the medium size, broadly ovate or sub- 

 circular in general outline. Dorsal valve nearly cir- 

 cular, moderately convex, the greatest convexity 

 being about one-third the distance from the beak 

 to the front part of the shell, umbo depressed. 

 Ventral valve much more convex, and the beak 

 produced beyond that of the dorsal valve, and 

 strongly recurved. . 



The only specimen we have seen of this tine shell 

 is an internal cast, with a fragment of the test ad- 

 hering to the beaks. Traces of ten or twelve broad 

 shallow plications can be seen on the front portion 

 of the shell, two or three of which probably extended to 

 the beak on the ventral valve, while the others became 

 obsolete before reaching the cardinal border. Traces of 

 fine longitudinal striations are also visible with a good 

 glass. Length from the beak to the front 23, breadth 

 22, heighth 14 millimeters. 

 Dedicated to the memory of Mr. Wm. Gifford, of Peoria county, 

 111., from whom the specimen was received. 



Position and locality: Middle Coal Measures near Alta, Peoria 

 county, 111. 

 Illinois State collection. 



