22 



TERRESTRIAL CARBONIFEROUS ARACHNIDA. 



carapace a longitudinal groove runs obliquely backwards and inwards, its anterior 

 extremity starting at a point nearly on a level with the })osterior end of the ocular 

 tubercle. The posterior i)ortion of the carapace on each side of the median groove 

 is distinctly but irregularly granular. 



The abdominal terga are granular, but there is no evidence that they 

 possessed cither median or lateral crests. They appear to be perfectly normally 

 constructed. The posterior borders of the first, second and third are not clearly 



Fig. 5. — Anthracoscoi-jnu dutilujn, sp. n. ; suggested restoration of the type specimen, approximately 

 nat. size, with the abdominal somites contracted. — Upper Coal Measures ; Driinigray. K. Dunlop 

 Collection. 



defined; those of the fourth, fifth, sixth and seventh are more distinct, especially 

 that of the sixth. The seventh tergal plate is a little longer than half the length 

 of the carapace, its posterior width exceeding half its anterior Avidth. 



Of the tail only the anterior four segments and a portion of the fifth are 

 preserved. It is neai-ly parallel-sided, the first segment being a little wider than 

 the second, and the second than the third and fourth, the two last being approxi- 

 mately equal in width. The second, third, and fourth segments are almost equal 

 in length, being a little longer and a little narrower than the first. The structure 

 of the segments is normal, each being marked in the middle line by a shallow 

 groove; the superior crests are small and distinctly and cA'culy granular, but in no 



