Reviezv of Recent Gcologkal Literature. 313 
pretty equal commingling of lower and upper Silurian elements (earlier 
Silurian: Orthis freitana, O. smithi, Anodontopsis putilla, A. austina, 
Tellinomya pulchella, T. subrecta, Clidophorus brasiliensis, Primitia 
minuta; later Silurian: Lingula cf. oblata, Lingulops derbyi, Orthis 
callactis, var. amazonica, Chonetes cf. nova-scotica, Anabaia paraia 
(comp. A. anticostiensis), Bucaniella trilobata, var. brasiliensis, Tent- 
aculites, Conularia amazonica, Bollia lata, var. brasiliensis): hence "the 
inference is quite natural that in this region the break in the record 
represented by the conventional plane of separation between the upper 
and lower divisions of the series is obliterated. The fauna is a middle 
Silurian." 
The material described in the second paper was collected in the 
Devonian strata about the little village of Erere and along the banks of 
the rivers Maecuru and Curua, northern confluents of the Amazonas, 
by an expedition that consisted of Messrs. O. A. Derby, Dr. J. de 
Freitas and H. H. Smith, and had been sent out by the late professor 
Ch. Fred Hartt. when director of the Commissao Geologica do Bra- 
zil. This expedition visited Erere. the fauna of which locality had 
been made known before by Messrs. Hartt and Rathbun, and dis- 
covered the remarkable localities on the Maecuru and Curua rivers. 
The brachiopods collected at these places have been described by Mr. 
Rathbun (Proc. Boston Soc. Nat. Hist., vol. xx), and the trilobites 
by Mr. Clarke (Arch, do Mus. Nac, vol. ix), who, by the present 
publication, has been permitted to bring to public notice all mollusk? 
from the latter localities and the new. or not yet illustrated, forms 
from Erere. 
The richness of the new localities is proved by the fact that the 
expedition, though handicapped by the possession of only one canoe, 
produced 78 species as against 48 species from Erere, the output of 
three collecting visits. 
It becomes apparent from Derby's description of the geologic re- 
lations of the Devonian of the lower Arhazonas, that the fossils came 
from a few beds of white or yellowish sandstone, which have a thick- 
ness of thirty feet, and which yield the fossils as beautifully preserved 
impressions. 
The analysis of the Brachiopoda by Mr. Rathbun brought out the 
fact that the fauna of the Maecuru district and that from Erere are 
different, and bear about the same stratigraphic and palseontologic 
relations to each other as the Corniferous group and the overlying 
Hamilton group of New York do, which Rathburn, therefore, consid- 
ers as their equivalents. 
The following forms of Platyceras are described: PI. whitii (M.*), 
PI. whitii var. curua (C), PI. hussaki (M), PI. steinmanni (M), PI. 
hartti (M). PI. symmctricum. Hall (E), PI. symmetricum var. ni;e- 
curuense (M). There are three species of Diaphorostoma. viz.. D. 
darwini (M and C), D. ? agassizi (M) and D. furmanianum Hartt 
*M signifies Maecuru; C, Curud, and E, Erere. 
