276 ROYAL SOCIETY OF CANADA 
approach the posterior extremity ; the last joint is broadly lenticular, 
obscurely outlined and contains the anus. 
The suture at the back of the thorax and the sutures between the 
three first joints of the abdomen are of equal prominence, but those of 
the posterior segments of the abdomen become more and more obscure. 
The imprints of two detached limbs of the thorax have apparently 
been preserved ; the limbs as thus shown consist of six joints, which are 
about as long as the segments of the abdomen, except the fourth joint 
which is longer; the posterior joint is narrow and sharp-pointed. A 
detached anterior limb, which has been preserved, has a broad, probably 
lamellar termination. 
Sculpture—The whole body was granulated, the markings being 
just visible to the naked eye. 
Size—Length 10 mm. Width 7} mm. Length of the limbs 5 mm. 
Horizon and Locality.—Same as the preceding species. Rare. 
This remarkable Arachnid is different from any known type, but it 
appears to come nearer the genus Anthracomartus than to any other 
forms of this sub-class, ancient or modern. 
EURYMARTUS (?) SPINULOSUS, n. sp., Pl. II., Fig. 9. 
A rather smaller species than the preceding. Only the abdomen is 
known. 
The abdomen is ovate behind, and is marked by nine transverse 
rings. The three posterior and the anterior ring are obscurely defined 
(the latter owing to imperfect preservation). There is a marginal ridge 
near the sides and back of the abdomen; along the inner margin of this 
ridge at the sides there is a double row of spines (the row on the marginal 
ridge being directed inward and backward, and that at the ends of the 
segments being turned outward and backward). A pustule within the 
marginal ridge, at the posterior end of the abdomen, appears to mark the 
position of the anus. 
Sculpture.—The surface is very finely pitted. 
Size of the abdomen.—Length and width each 6 mm. 
Horizon and Locality.—Same as the preceding. Rare. 
This little species, by its broad marginal rim, straight anterior edge 
to the abdomen, and form of the segments, appears to belong to Eury- 
martus, but the absence of the cephalothorax makes the reference 
doubtful. 
Though we have said that these Arachnids are allied to the Anthra- 
comarti, it is only by a distant relationship. The most obvious distinction 
is the entirely different arrangement of the bases of the limbs, and the 
absence of wedge-shaped segments to the cephalothorax. The coxe are 
arranged in two distant rows converging forward. It would appear then 
