Invertebrata from the Neocomian of Kansas. — Cragin. 3 
PINNA COMANCHEANA. sp. nov. 
Shell large, thin; anteriorly inflated and subcircular in 
cross-section, becoming more compressed and with exteriorly 
concave upper slopes posteriorly ; not, or only very obtusely, 
angulated along the median line; increase of hight with 
distance from beak more rapid than in P. lakesii White; 
decussately ornamented with rather remote radial costelhe 
and somewhat less conspicuously raised remote concentric 
lines, there being about nine of the radial costelhe on the con- 
cave slope. 
The shell attains a length of at least eight or nine inches. 
Oeeurrenee. — Common in rocks of the Fredericksburg division in 
Kansas, Texas and New Mexico: especially in the Comanche Peak 
limestone of Texas. The largesi specimen that I have observed is in 
the collection made in the Tucumcari district of New Mexico by the 
W. F. Cummins' party of the Geological Survey of Texas. The types 
are specimens in the writer's private collection from Kansas and Texas 
and in the Colorado College collections from southwestern Kansas. All 
of the specimens thus far obtained near Belvidere, Kansas, are from 
No. ."> of the Belvidere section. 
CUCULL/EA (IDONEARCA) TERMINALIS. var. nov. recedens. 
Plate I. fig. ]!). 
The hinge of Cueullaea terminalis Con. being entirely un- 
known, I present a figure of the interior of the Belvidere, 
Kansas, Tdonearca which I provisionally referred to C. ter- 
minalis in my "Contribution to the Invertebrate Paleontology 
of the Texas Cretaceous" (Fourth Ann. Rep. Geol. Surv. of 
Texas, p. 175). This shell occurs in great abundance in No. 
5 and occasionally in No. 3 of the Belvidere section ; and is 
found through the entire thickness of the Comanche shales of 
Clark county. 
As compared with the type-figure of ('. terminalis, the Bel- 
videre species has the beaks less anterior, and by no means 
terminal, though their position is somewhat variable and the 
figure now given represents perhaps ;t little more than the 
average of their recession from a terminal position. 
Typical C. terminalis belongs to the Alternating beds, 
while the C. recedens belongs to the lower part of the Fred- 
ericksburg division, as represented in Kansas and as seen on 
a hill-slope a little west of Weatherford, Texas (where oc- 
curs a shell-bed that is apparently the equivalent of No. "> of 
