PROUT—NEW SPECIES OF PRODUCTUS. 43 
ie Dieleription of a New Species of i bc ay from 
the Carboniferous pated of St. Louis. By Hie 
A. Prout, M.D. (Plate IT.) : 
FAMILY, PRODUCTID. (Davidson.) 
Genus, Propuctus. (Sowerby. ) 
Group, Semireticulati. (De Koninck.) 
Propvuctus mMarcGinicinctus (nob.) 
som of medium size, subquadrate, slightly transverse in full 
wn specimens, as broad as long in those of middle age. Dor- 
Sa valve vaulted, with the arch sightly isefining cowards the beak. 
ed 
and flattened near the anterior border; sinuated, sinus shallow. 
and swell in a somewhat alternate manner, in nearly concentric 
rows, into long tubercles, which, at their lower termin 
gin to long and slender spines; this arrangement of the tuber as 
resembles that so beautifully displayed alike on the surface of the 
P. subquadratus and the P. Cancrini ; neck slightly tapering into 
ranular th 
_ obsolete; deltidium none. This valve terminates below ina — 
and prominent oe or ring, separated from reer main _—* 
ere pine inte the conti- 
‘tee The con tie ges are yore toate createed 
a eb tnatiin. concentric s are not so east 
goer: except on saricaler 
peck, where they are much coarser, Sa gee le 
eek Go phiy chirkees ou thes an! 
: face of the sell. ‘This valve bed hemor? = ee nd 
= 
ons on and — - 
a wrinkled 
