278 ROYAL SOCIETY OF CANADA a 
From the known species of Eurymartus this fossil differs in the short 
facet at the front of the abdomen indicating a cephalothorax narrower 
than the abdomen, and in the absence of a marginal rim. 
CRUSTACEA, 
AMPHIPELTIS PARADOXUS, Salter, Pl. IL, Fig. 6. 
Quart. Jour. Geol. Soc., Feb., 1863. 
Acad. Geol., 2nd Ed., p. 523. 
The type of this crustacean, described some thirty years ago by Mr. 
J. W. Salter, is not now available to me ; 1 therefore describe herein the 
example preserved in the museum of the Natural History Society of New 
Brunswick, St. John, N.B. 
This consists of five segments of the body. Of the anterior segment 
only a fragment is preserved ; the next three segments bear pleural spines 
directed backward, those on the two posterior of the three being larger ; 
in the last segment the spinal ridge is turned inward and apparently fused 
with the segment, forming part of a broad, lamellar terminal, plate, as in 
the typical example described by Mr. Salter. 
Sculpture.—The several segments bear various markings ; the second 
has two small tubercles near the axial line, and the fourth and fifth have : 
pleural grooves, somewhat distinctly impressed. The whole surface of 
the test is minutely pitted. 
Size of this mutilated example. Length 15 mm. Width 12 mm. 
Horizon and Lovality.—From Plant Bed No. 2, Lower Cordaite Shales 
Little River Group, St. John, N.B. 
Judging by the name given it, this was a perplexing fossil to Mr. 
Salter. Sir J. W. Dawson suggested that it might have been allied to 
the Stomapods,’ a not unreasonable suggestion, considering the width of 
the front part, as shown by the type which Mr. Salter described. How- 
ever, with the author’s present view that ail the animals of this plant bed, 
are either aerial, terrestrial or palustral forms, he is compelled to look 
elsewhere for relatives of this crustacean. Among terrestrial Crustaceæ 
the Isopods seem the group which would most likely have left remains 
such as this. If Amphipeltis be of this group, the rapidly varying seg- 
ments would indicate that the example in the museum of the Natural 
History Society is a part of the pleon, probably the principal part ; and 
would indicate, so far as modern Isopods are concerned, an animal of very 
considerable size ; but still one not by any means so large as some fossil - 
Jsopods reported from the coal measures, and referred to the family 


Acadian Geology, 2nd Ed., p. 523. 
