<i The American Geologist. July, 1894 
Measurements. — Hight 28; length 27; breadth 17.5 mm., 
in the largest specimen; average specimens having about 
two-thirds of these dimensions. 
Occurrence. — The species abounds immediately south and southwesl 
of Belvidere, in the shell-platform designated as No. ."> of my Belvidere 
section, associated with Sphenodiscus pedemalis Ftoem., Schloeribachia 
peruviana VonB., Limopsis belviderensusCv&g., Serpula sp., etc. li is per- 
haps the commonesl fossil of this horizon, excepting tin- small or 
••//////" phase of Grypluea piteheri Mori. li occurs here, however, 
mostly in weathered specimens that show the shorl spines as more or 
less protuberant granules only. It occurs sparingly in No. 3, sometimes 
with the spines beautifully preserved. 1 have collected a few speci- 
mens in the lower part of the Bluff Creels Neocomian section in ('lark 
county, Kansas. I have also seen several examples of this species 
among specimens collected by Mr. W. F. Cummins in the Tucumcari 
dist rid in New Mexico. 
(7CARDIUM) MUDGEI. sp. nov. 
Size apparently about that of Cardita belviderensis, shell 
ornamented with heavy, narrowly-interspaced, round-topped, 
radial ribs, and with numerous freely projecting, concentric, 
lamellar borders, which are relatively more prominent in cros- 
sing the ribs than elsewhere, forming thereupon strong hood- 
like imbrications. Within a space of 9 millimeters on the 
ventral margin of the type specimen, there are 5 ribs, and on 
the largest one of these ribs there are, on the distal 7 milli- 
meters of its length 9 of the hood-like imbrications. 
Occurrence. — No. 3 of the Belvidere section, about a mile and a half 
southwesl of the Belvidere railway station. 
Only a part of a single valve of this shell has been round, so that the 
generic place of the species is somewhal doubtful; but the ornamenta- 
tion is of such a character as to readily distinguish the species, which 
may belong to Cardita or to Pectunculus. 
The Fox Hills bivalve, Pectunculus subimbricatus M. A: EL, as figured 
in Meek's Cretaceous [nvertebrata, PI. 28, fig. 1 1 a , is a shell whose orna- 
mentation recalls, but does not specifically duplicate, that of the pres- 
ent species, its hood-like spines, or imbrications, being less prominent 
than in the latter and o| herwise different. 
The species is named after that most excellenl pioneer worker in Kan- 
sas geology, the late Prof. Benjamin F. Mudge. 
CARDIUM (NEMOCARDIUM) BISOLARIS. sp, nov. 
Plate I. fig. 16. 
Shell small, quadrilaterally or subtriangularly rotund, of 
moderate convexity; beaks subcentral, slightly in advance of 
the middle; posterior fourth (or less than fourth) part of 
