292 
Aug. F. Foerste 
among the types in the Ulrich collection in the U. S. National Mu- 
seum, at Washington. 
The type of Chirospongia faheri is preserved in the Faber col- 
lection at Chicago University; it is numbered 8827 and is also listed 
as coming from Cincinnati, Ohio. In the original description it is 
stated to be associated with Pattersonia about 350 feet above low 
water in the Ohio river. The type of Chirospongia faheri is here 
figured. It gives but little information regarding the structure 
of the sponge wall. Numerous, relatively thick, short striae, regarded 
as spicules, from half to three-quarters of a millimeter long, traverse 
the surface longitudinally. These are arranged in quincuncial 
order, so as to produce the effect not only of longitudinal striation, 
but also of a sort of oblique striation. Locally, the thick longi- 
tudinal striations appear to be interwoven with much finer, ap- 
parently short, cross striations. While some of the latter striations 
make angles of about 60 degrees with the coarser longitudinal stria- 
tions, this angle is not known to be constant, and the exact form 
of the spicules, whether three-rayed or six-rayed, can not be de- 
monstrated from this type. 
By Ulrich, the surface of Leptopoterion mammiferum was 
regarded as suggesting a net-work of overlapping hexactinellid 
spicules having the six rays spread in one plane, but the evidence 
is not conclusive. 
6. Protaraea vetusta, Hall 
{Plate II, Fig. 3) 
1817. Porites ? vetusta Hall, Pal. New York, 1, p. 71, pi. 25, Figs. 5a, b. 
1 851 . Protaraea veOiMa Edwards and Haime, Ann. Sci. Nat., 3rd ser. ZooL, 16 p. 17. 
1899. Protare^ vetusta Lambe, Cont. Canadian Pal. Geol. Surv. Canada, I, pt. 1, 
p. 90, Plate 5, Figs. 8, 8a 
The type of Protaraea vetusta, numbered 642, is preserved in the 
American Museum of Natural History, in New York City, and is 
labelled as coming from the Trenton at Watertown, New York. 
The number of corallites is about 5 in a length of 5 millimeters, 
sometimes equalling only about four and a half corallites in this 
distance. The surface of the type is badly weathered and the 
septa can not be traced beyond the immediate vicinity of the walls, 
though probably reaching half way toward the center of the calyces 
in well preserved specimens. The vertical tubules in the spaces 
between the corallites are fairly distinct under a lens. The specimen 
