Geology and Mineralogy. 143 
is developed a chitinous rod in almost all respects like that of the 
graptolites.* 
On the whole, then, it would seem that the graptolites consti- 
h if fiinity 
Thave proposed to designate them.’ 
. Descriptions of New Species of Fossils, from the vicinity of 
Louisville, Ky.; by James Hart and R. P. Wurrrtetp (con- 
tinued). 12 pp. 8vo. Published June 12, in advance of the 
Report on the State Museum.—The species described are Brachio- 
, nort 
and South, is unquestionably Cretaceous. It is covered with beds 
gain, the branches of the large Madrepore of the wreck were 
Widely spaced, those of M. cervicornis having intervals of from 
Six to eighteen inches or more between the branches. 
ct it is impossible to make any exact estimate of the 
rate of growth of the reef; because a large part of the reef-grounds 
Sen at is, of the region of soundings receiving the eoral débris— 
i t 
. ora . 
<— of all Aiea. aie and channels among reefs, the bottoms of 
ic , as 
8reat extent so because too deep for living corals; and it is true 
wee, compari vith that of a graptolite has al- 
parison of the rod of Rhabdopleura with that of a graptolite 
ready been made by Dr. Nicholson (‘Manual of Zoology”), though he adopts the 
ao generally accepted view which finds hydrozoal rather than polyzoal affiniti 
‘the graptolites. 
