[MATTHEW ] ORGANIC REMAINS OF LITTLE RIVER GROUP 275 
The following summary of the fossil Arachnida is condensed from 
Dr. Scudder’s review of these forms given in Bulletin 31 of the United 
States Geological Survey." 
ACArL (Mites) muller GIE VE RE RE eh cle del cb centres 36 species. 
Chelonethi (Pseudoscorpions), Tertiary.... .....:.....--.... 9 % 
Anthracomarti (extinct order), Carboniferous ............... 16 se 
Pedipalpi (Spider Scorpions), Carboniferous................ . 2 as 
Scorpiones (Scorpions), 3 Silurian, 8 Carboniferous, 1 Tertiary 12 + 
Ophiliones (Spider Mites), Tertiary . 7... ,2 1... 13 oe 
Araneæ (Spiders)—2 Carbonif., 1 Jurass., 226 Tertiary........ 229 ce 
It is chiefly with the extinct order of Anthracomarti that we are at 
present interested, and this from the fact that Arachnids allied to this 
order have been found in the plant beds at St. John. 
EURYMARTUS, n. gen. 
KURYMARTUS LATUS, n. sp., PI. IL, Fig. 7. 
Body oval, angulated in front at the sides. No distinction of width 
between the cephalothorax and the abdomen. 
Cephalothorax bounded by a narrow raised border or rim. The 
cephalon has traces of organs in front which are probably antennæ ; and 
centrally has a curved row of six (or eight) small scars, in a position 
where the eyes might be looked for, The cephalon is divided from the 
thorax by a narrow, low border. 
The thoracic segment is sub-quadrilateral, more than three times as 
long as wide, sides slightly contracted at the back where it joins the 
first abdominal segment. The thorax is inclosed by a narrow raised 
rim, and has protective spines at the anterior and posterior corners 
on each side, the anterior spines directed outward and the posterior 
backward. On each side of the thorax is a row of about eight scars ; 
these rows are inclined towards each other anteriorly, but are as far 
apart in front as the cephalothorax is long, At the front edge of 
the thorax in a line with the row of scars on each side, is a small elon- 
gated scar which may mark the point of attachment of a palpus ; also at 
the back of the thorax, outside the posterior scars on each side of the 
thorax, is a small round scar, perhaps indicating a spiracle. 
The abdomen of seven joints, is about as long as wide. It is divided 
longitudinally in three regions, a central one or rachis, inclosed by a 
sloping pleural region, and the whole bordered by a slightly raised, 
rather broad, marginal band. ‘The first two rings of the abdomen are 
armed on each side with anterior and posterior spines, directed backward, 
the five posterior segments are arched more and more at the sides as they 


1 Systematic review of our present knowledge of fossil insects, U.S. Geol. Survey, 
Bulletin No. 31. 
