1890.] Geology and Paleontology. 845 
The volume is divided into three parts, viz.: I. On the Fishes of 
the Silurian System; /II. On those of the Devonian; and II. On 
those of the Carboniferous System. The number of species referred to, 
and the number described in the divisions of these systems, is as 
follows : 
SILURIAN SYSTEM. 
— Enumerated. Described. 
Onondaga Salt Series, ....... rcs o 
DEVONIAN SYSTEM, 
ee ao. n oo t a 20 I4 
MM | o0 ou 4 4 AS X Mosi C 8 8 
CARBONIFEROUS SYSTEM 
Chad 27. 7 ENS 9 
DEREN, - us s MEUS quaii 9 
Waverly, i va STR es 48 5 
Cleveland Shades a ovs 28 26 
Carboniferous Limestone, . . . . . . 347 14 
Coal Mei, . Lu uy Lu 27 2 
Tota. nen £v. 498 87 
Among the eighty-seven species described are a number of very 
interesting ones, several of which are referred to new genera. From 
Corniferous series we have Acantholepis and Acanthaspis Newb., 
ich the author thinks to be allied to Cephalaspis. From the Ham 
uin. Goniodus Newb., probably a Cestraciont shark ; and Ciüloiiidhus 
Newb., small forms allied to Dinichthys. From the Chemung, Holo- 
nema Newb., based on the Pierschthys rugosa of Claypole, a remark- 
able Placoderm of large size. From the Cleveland Shale, Titanich- 
thys Newb., a member of the Dinichthyids, but different from Din- 
ichthys in the slender edentulous jaws, with two species; Glyptaspis 
Newb., another Placoderm belonging to the Dinichthyidz ; Mylostoma 
Mew. another member of the same group, with flattened grinding 
surfaces on the extremities of the dentary bones; Trachosteus, an ally 
of the same family ; and Actinophorus Newb., apparently a very prim- 
itive representative of the modern superorder of the Actinopterygia, 
and therefore a very interesting discovery. The Waverly produces 
the new genus Mazodus Newb., which is based on the flat-grinding 
teeth of some Cestraciont shark of large size. To the fauna of the 
Carboniferous Limestone is added the genus Ccelosteus Newb., based 
on a mandibular ramus, with shallow alveolz for large teeth, probably 
