460 Reviews—Dr. W. Dames—The Triassic Ganoids. 
known merely from detached scales, but is represented by the anterior 
portion of a fish and two examples of the head; and Dr. Dames points 
out that some of the scales have been named G. maximus, Ag., and 
G. tennistriatus, Ag. G. Quenstedti is a new species, founded upon 
the hinder portion of a fish, remarkable for the great length of the 
anal fin and the comparatively remote situation of the dorsal. 
The genus Colobodus proves to be a Lepidosteoid Ganoid related 
to Lepidotus, and having no connection with the Pycnodonts, to 
which it is commonly assigned. It differs from Lepidotus, so far as 
known, in the presence of an apical tubercle upon the rounded 
teeth, in the prominence of the scale-ornament, and in the depressed 
form of the head. Considerable variation, however, is exhibited in 
the five recognized species; and while relegating Ductylolepis, 
Nephrotus, ani Asterodon to the synonymy, Dr. Dames suspects that 
future discoveries may possibly justify the retention of the two 
first-mentioned names for the peculiar species to which they were 
originally applied. The fins and the precise form of the trunk 
are still unknown in all the species: but tolerably complete specimens 
of the squamation and dentition are described, and these lead to a 
considerable reduction in the number of “species” based upon 
isolated scales and teeth. 
A new genus and species, Crenilepis Sandbergeri, is founded 
upon a well-preserved portion of the squamation of a large fish from 
the Upper Muschelkalk of Krainberg, evidently related to the 
earlier Lepidosteoids, and distinguished by the form and ornamen- 
tation of the scales. In the anterior part of the flank, the scales are 
very much deeper than broad; and those of all parts are externally 
sculptured with a number of delicate branching furrows. 
The type- “species of the genus Serrolepis, Quenstedt, from the 
Lettenkohle, is now named S. suevicus; but only scattered scales 
are known, and Dames doubtfully associates with this fish a frag- 
ment of jaw, with stout styliform teeth, discovered upon the same 
slab of stone. On the whole, the genus seems most probably allied 
to Dapedius. 
In conclusion, Dr. Dames discusses an interesting problematical 
fish from the Upper Muschelkalk of Brunswick, not yet determinable, 
but in some respects suggestive of close relationship with the 
Semionotide. A summary of results then follows, and it is in- 
teresting to note how the distribution of species of Ganoids in the 
Muschelkalk agrees well with that of the Crinoids and the Cephalo- 
pods, the Lower, Middle, and Upper divisions being distinctly 
separated, and also the overlying Lettenkohle. 
A brief appendix records the occurrence of other well-preserved 
Ganoids in the same formation, including probably a new Paleoniscid 
genus, a new species of Gyrolepie, and a fish allied to Pholidophorus. 
These, and any other materials with which the author may be 
favoured, will form the subject of a second memoir to which we look 
forward with considerable interest. AS We 
