H. I. Pocock — A New Carboniferous Arachnid. 249 



it may be inferred that the sternal area of the cephalothorax (prosoma) 

 was wide, as in Eoplirynus. 



The opisthosoma (abdomen) shows very distinctly eight, and only 

 eight, plates on its upper side. It thus resembles this region in 

 Kreiseheria wiedei, and dififers from that of JiJophrynus prQstvicii, 

 where nine plates are exposed, the first and second being short 

 and apparently representing conjointly the first that is retained in 

 Kreiseheria wiedei and in the species now under notice. In the latter 

 the first is the shortest of the series, the second the longest. The 

 posterior border of the first is slightly convex in the middle ; that of 

 the others is fairly straight from side to side, although on account of 

 a distinct and gradual elevation of the median area of the second, third, 

 and fourth, this border appears from a superficial examination to be 

 slightly concave in the middle. In the comparative straightness of the 

 hinder border of the posterior terga, this species differs strikingly not 

 only from EopJiryniis and Kreiseheria, but also from Brachypyge and 

 Anthraeomartus, in all of which the terga become progressively more 

 and more recurved towards the posterior extremity of the abdomen. 

 In the middle of the terga there is a distinct triangular granular area, 

 wider behind than in front ; there is also a series of fine granules 

 defining the divisional lines between the terga and their laminas ; 

 but the tubercles, which form so conspicuous a feature on the terga 

 and lateral laminse both of Eophrynus and Kreiseheria, are here 

 represented by a single pair of small tubercles upon the terga, and 

 these are scarcely discernible on the anterior segments. The lateral 

 borders of the third, fourth, fifth, and sixth terga are slightly produced 

 anteriorly, and come into contact with the proximal extremity of the 

 posterior side of the lamina of the antecedent segments. The lateral 

 laminge, too, are very different from those of the genera of Anthraco- 

 marti hitherto described. None are visible upon the first ; on the 

 second they appear as slender sclerites lying obliquely backwards ; 

 on the third and fourth they are of the same form, but larger, and 

 project back in the same way, and their external margins are bordered 

 by a strip of chitinous integument belonging to the lateral or ventral 

 area of the body. It is not until the fifth segment is reached that 

 the laminge are at all comparable in development to those of other 

 genera. From the fifth backwards they ai-e large but fairly normal 

 in size and form, their outer edges forming an evenly continuous 

 curve. The posterior angles of the laminee of the sixth and seventh 

 segments, not of the seventh and eighth as in Eophrynus and Krei- 

 seheria, seem to be furnished with a spiniform process ; but upon 

 this point it would be rash to make a positive statement. The eighth 

 segment is large, and furnished with the normal median and the 

 two lateral laminse separated by a deep groove ; the lateral laminse, 

 however, are not marked off from the median area of the tergum, as 

 is the case in most other Anthracomarti known. Owing to the small 

 size of the anterior lamina3 and the large size and obliquely backward 

 direction of those at the posterior end of the abdomen, this region of 

 the body is much longer in proportion to its width than in most 

 Anthracomarti. The impression of the circular anal plate, omitted 



