Authors' Catalogue. 383 
ous tubes having some of the characters of Hyolithes. For another 
type of these tubes the genus Byronia is proposed; these are annulated 
like Tentaculites, but are larger and flexuous. 
The following genera of trilobites are recognizea: Ogygia (Ogy- 
gopsis) Bathyuriscus, Zacanthoides, Neolenus (n. gen) Ptychoparia, 
Dorypyge, Agnostus, Corynexochus, Dolichometopus. Oryctocephalus 
and Conocephalites. On a review of these genera, and their geological 
range the author expresses the opinion that the fauna of Mt. Stephen 
cannot be older than the Peltura fauna of Europe. 
At page 64, an interesting table is given showing the gradual reduc- 
tion in the number of the body rings, etc., of the trilobites during the 
progress of the Cambrian age; and also the growth of the pygidium 
at the expense of the thorax. 
Studies on CiDiibrian Faunas, No. 4; Fragments of the Cambrian 
Faunas of New Foundtand. (Trans. Royal Soc. Can., Ser. 2, vol. 5, 
sec. iv, p. 67.) 
The fossils described herein are chiefly from the Paradoxides and 
Protolenus zones. From the latter a number of new species are de- 
scribed, and several species of the former zone are discussed. The 
species Conocoryphe trilineatus is recognized, and supposed to be from 
the beds carrying Paradoxides davidis. Erinnys venulosa Salt, is re- 
ported from the same beds, and is referred to Harpides breviceps Aug.. 
but Salter's generic name is retained for it. A large Paradoxides 
like trilobite is referred to the Sardinian genus Metadoxides, Borne- 
mann. 
A third article on the Etcheminean fauna of Smith sound, New 
Foundland, has already been reviewed in this journal. 
There are eight plates of figures of the different species described 
in these articles. 
MONTHLY AUTHORS' CATALOGUE 
OF American Geological Literature, 
Arranged Alphabetically.* 
Ashley, Geo. H. 
The coal deposits of Indiana. (23d Ann. Rep., Dept. Geol. & Nat. 
Resources, pp. 1565, 7 geol. maps, 90 sketch maps, and numerous plates 
and figures. ) 
Bennett, L. F. 
Notes on the eastern escarpment of the Knobstone formation. 
(Proc. Ind. Acad. Sci., 1898, pp. 283-288.) 
*Tlii.s list includes titles of articles received up to the 20th of the precediiiK 
month, including general geology, physiography, paleontology, petrology and 
mineralogy. 
