266 Scientifie Intelligence. 
The mass of sediments which directly underlie this St. John 
Group, including the conglomerates called EKtcheminian by the 
author, are now regarded by him to be actually Pre-Cambrian. 
This fauna, therefore, appears to be the oldest of which we 
have any elaborate knowledge, although it should be noted that 
the Olenellus fauna has not been discovered in this section, and the 
fauna immediately succeeding the Protolenus fauna in the Han- 
ford Brook section is the Paradoxides fauna. 
The fauna is thoroughly primordial in character: there are two 
genera of Foraminifera (Orbulina and Globigerina). There are 
three genera of Spongida (Monadites, Protospongia and Astro- 
cladia?). The Brachiopoda are represented by JLingulella, 
Obolus, Trematobolus, Obolella, Linnarssonia, Acrotreta, Acro- 
thele, and a specimen referred to as an Orthid. Among the forms 
referred to Obolus are some which differ slightly from the typical 
genus and are described under the subgenus Botsfordia. The 
author has been able to make out several stages of development 
for B. pulchra, which he summarizes as follows: “ This species, 
then, is marked by four stages of growth and development, of 
which the most prominent features are the following :— 
(1.) Embryonic.—Formation of the embryonic shell. 
(2.) Larval or nepionic.—Lengthening of the hinge line and 
acquisition of mantle-margins. 
(3.) Adolescent or nealogic.—Fixation of the hinge line, other- 
wise as the last, except that the radular ornament becomes 
irregular. 
(4.) Adult or ephebolic.—Absence of radular ornamentation on 
the valve, and great expansion of the mantle-margin.” The genus 
Trematobolus is remarkable as combining the unmistakable char- 
acteristics of the inarticulate order of Brachiopods, yet having a 
distinct articulation of the hinge line. The mollusca are repre- 
sented by Hyolithellus, Coleoides, Orthotheca, Hyolithes, Diplo- 
theca, a peculiar new genus, Pelagiella, which appears to have 
been a free swimmer and to belong to the Heteropoda, and Vol- 
borthella. In this group the Hyolithide are prominent, and all of 
the mollusca seem to have been of pelagic type. Nearly half of 
the species described are Arthropoda. Among the Ostracoda 
are Hipponicharion, Beyrichona, Aparchites, Primitia, Schmid- 
tella and Leperditia. The new genus Beyrichona was originally 
described in the Transactions* of the: Royal Society of Canada, 
and the author, upon study of better material, has modified the 
description by reversing the anterior and posterior portions of the 
shell. The two species referred to Aristozoa by Walcott, Mr. 
Matthew considers to be species of this genus. One supposed 
Phyllopoda (ZLepiditta) is described. Of Trilobites, thirteen 
species are described, and referred to the genera Protograulos, 
Elllipsocephalus, Micmacca, Avalonia, Protolenus and Bergeronia. 
As salient features separating this fauna from all others, the 
author mentions the following points: All the trilobites have 
* Vol. ili, p. 65. 
