70 
BULLE'riN OF THE LABORATORIES 
■or a little wider than the branches, nine, sometimes ten in lo 
mm. 
Reverse : — Here the branches are more or less strongly rounded, 
the dissepiments nearly on a plane with them, and both somewhat 
thinner, the fenestrules larger than on the opposite face of the zoarium. 
The whole surface is covered with the sub-angular or elongated ori- 
fices of small pores, usually exhibiting a marked tendency to a longi- 
tudinal arrangement. 
This peculiar species is known only from natural moulds of the 
■exterior, and the characters above described are furnished by gutta-per- 
cha impressions. Those showing the obverse side exhibit a feature as 
yet not well understood, but which I am inclined to attribute to a pecu- 
liar state of preservation. The mouths of most of the zooecia are sur- 
rounded, namely, by a circular impression instead of a raised margin. 
This feature appears so anomalous that in preparing figure 7-a I have 
taken the liberty to substitute (excepting in the upper right hand zooe- 
cium) a raised line where the gutta-percha shows an impressed one. 
If I am right in ascribing this anomalous character to an unusual state 
of preservation then it is not impossible that the porous condition of 
the branches and dissepiments is due to the same cause. This, how- 
ever, is not probable, yet, if true, they must represent structures of 
some kind — tubercles perhaps. 
In its measurements this species approaches closely to F. Herrick- 
■ana. Aside from the supposed differences in the surface markings 
they differ in the following particulars : F. Herrickana has thirteen 
or fourteen zooecia in 5 mm and seven or eight fenestrules in 10 mm. 
where F. cavernosa has, respectively, fourteen or fifteen and nine or 
ten. 
Formation and locality : — Waverly group, at Sciotoville, Ohio, 
where it occurs, associated with Strehlotrypa amplexus and numerous 
brachiopoda in ferruginous clay nodules. 
FENESTELLA REGALIS, Ulrich. 
(Plate XIII, Fig. 5, 5a.) 
Fenestella regalts, Ulrich. Kept. III. Geol. Surv. Vol. VIII, pi. i, fig. i, la. 
(now in press.) 
All of the Ohio specimens of this species before me are mere 
fragments. The most of them agree quite closely with the typical 
