Rhyiichopora, King, .-i Xczv Species. — Grcger. 297 
ON THE GENUS RHYNCHOPORA, K1N(;, WITH 
NOTICE OF A NEW SPECIES. 
Uy V. K. <".i<Kr,KK, Fulton, Missouri. 
The punctate, rhyiichonclloid genus, Rhynchopora, King 
(i) is represented in European faunas of Carboniferous and 
Pcmiian age by a limited number of species, of whicli the 
typical form, R. geinitziana de Verneuil (2) is the most prolific. 
This species was originally described from the Permian of Rus- 
sia and the labors of Prof. Tschernyschew and Dr. Stuckenberg 
have added two more species to the genus, also from that coun- 
try, viz.; R. nikifini Tschernyschew (3) and R. variabilis 
Stuckenberg (4). 
With the species enunu'ratcd above may be associated the 
R. yoioigi Davidson (5) from the Upper Carboniferous of 
Great Britain and the 7^. thcobahii W'aagen (6) from the Salt 
range of India. 
But a single species, Rhyiic/iopora piistiilosa White (7) 
has been identified, heretofore, in the faunas of the American 
Carboniferous. A\'ith this species and the two forms described 
in the present paper, the genus is shown to have as great a 
range of specific development in this country as in Europe. 
Quite recently while making sections for microscopic study, 
we had occasion to cut a specimen of RliynclioncUa iUinoiscnsis 
Worthen (8 ) a shell with a pronouncedly fibrous external struc- 
ture, and we were not a little .surprised to find the internal 
laminae of the shell highly punctate. 
Upon this discovery a careful examination of all the "Rhyn- 
chonellas" in our possession, from the American Carboniferous, 
was instituted, which resulted in finding an additional repre- 
sentative of the genus, from the upper beds of the Burlington 
limestone. 
Rhynchopora beecheri, (si>. nov.) 
Form and Outline of Shell: Sub-trigonal ovate, length and 
breadth about equal in neanic and ephebic specimens, with a 
tendency to become transverse and somewhat gibbous in geron- 
tic individuals. Beaks obtusely pointctl. 
Pedicle valve : Depressed convex or nearly flat, with the 
mesial sinus well defined, beginning somewhat posterior to 
