INVERTEBRATES. 251 



Should future discoveries prove this type to be only one of a series connect- 

 ing Palscchinus and Mdonites as sections of one genus, its name would become 

 Palsechinus Danse, since Palsechinus has priority over either of the other names. 



Locality and position : Jersey county, Illinois. Keokuk division of the 

 Subcarboniferous series. Also at Warsaw, Illinois, at same horizon. We have 

 likewise seen a specimen of apparently the same species, in Dr. Shumard's col- 

 lection, from Fenton, St. Louis county, Missouri. 



MOLLUSCA. 



BRACHIOPODA. 



Genus CAMAROPHORIA, King, 1844. 



(Ann. and Mag. Nat. Hist., vol. xiv.) 



CAMAROPHORIA SUBTRIGONA, M. and W. 



PI. 18, Fig. 8 a, 8 6, 8 c. 



Rhynchonella subtrigona, Meek and Worthen, Oct., 1860. Preceed. Acad. Nat. Sci., 

 Philad., p. 451. 



Rhynchonella Parvini, McChesney, Feb., 1861. New sp. Fossils from Palaeozoic rocks 

 of the Western States, p. 83 ; also, 1865, Illustrations of ditto, plate 6, figure 2. 



Compare Atrypa isoryncha, McCoy, 1844. Carboniferous Fossils, Ireland, p. 154;= 

 Camaropharia isoryncha, McCoy, 1852. British Pal. Foss., p. 444; Davidson's Brit- 

 ish Carboniferous Brachiopoda, p. 117, pi. xxv, figs. 1 and 2, la and lb. 



Shell rather above medium size, trigonal-subglobose, wider 

 than long, usually gibbous, truncated in front and on each 

 postero-lateral slope; anterior margins of the valves sharply 

 and deeply serrated; posterior lateral slopes each forming a 

 flattened or concave oval space, without well defined plications, 

 and limited by a more or less distinct angle on each valve. 

 Ventral valve nearly flat, or arching a little from the umbo 

 along the middle towards the front, on each side of which the 

 antero-lateral margins are at first elevated, then very abruptly 

 deflected towards the other valve ; front curving down nearly 

 at right angles to the plane of the valve, and extended so as to 



