188 KANSAS UNIVERSITY QUARTERLY. 
between the costae with an outward curve. Entire length un- 
known, but individuals incomplete in both extremities, 5 inches in 
length and 1.60 inches in breadth have been met with.  Indivi- 
duals of this size show at the thickest part 9g coste in a space of 
50) imehes.7* 
In addition to the above characters may be mentioned: In young 
specimens the cardinal septum and all the other septa on that side 
of the corallum are very greatly developed laterally after passing 
inward from the vesicular -zone; the inner wall of the vesicular 
zone is also thickened on that side of the corallum. As a result of 
this great thickening of the septa the interspaces are small, pro- 
ducing a peculiar appearance in cross sections as shown in figure 
1. The septal development becomes less and less marked as the 
specimen advances in age until in old specimens it is hardly 
noticeable, save in the cardinal septum, though a close comparison 
generally shows them a little larger on the outside of the general 
curve. These peculiarities may be seen by sectioning the large 
and small ends of any adult specimen. The thickness of the dis- 
sepimental zone and also the number of tabular dissepiments are 
variable, as will be seen by comparing figures 2 and 3 with those 
of Meek.+ Some specimens in the collections of the University are 
about g inches long and apparently incomplete at both ends. 
Such specimens are generally a litlie crooked throughout their en- 
tire length. The young specimens are either rather slender or 
quite turbinate; the latter form is shown in figure 4, which is twice 
natural size. Through the courtesy of Mr. Gharles Schuchert of 
the U. S. National Museum I have had the pleasure of examining 
some specimens from Rock Bluff, Nebraska, belonging to the col- 
lection studied by Meek, and upon which he based his description. 
These show the above mentioned pecularities quite distinctly. 
Specimens from Jefferson, Douglas, and Chatauqua counties, 
Kansas (all from about the horizon of the Lecompton Limestone 
of Bennett), show these characters equally well, as does also a 
specimen collected in a quarry in ‘‘Northrop’s Woods” about three 
miles west of Kansas City, Kansas. The horizon of the Rock 
Bluff locality is probably above that of the Lecompton limestone. 
It is evident that the species has a considerable geological as well 
as geographical range in Kansas. 
Among the many interesting fossils which the Turner Odlite has 
produced are two right valves of a Monopteria apparently quite 
distinct from any species I have yet seen described. . 
*Meek. Fin. Rep. U. S. G. S. Neb, 1872, p. 145, pl. i. Fig. TI. 
tLoe. eit 
