38 Alexander Petninkevitch , 



"The only specimen of this fossil yet known to us consists of a 

 cast and mould as revealed in splitting open a concretion. It shows 

 most of the cephalothorax and mandibles in somewhat crushed con- 

 dition, the dorsal side of the seven abdominal regments, and three 

 of those of the tail, all in place. Also four of the legs on one side and 

 one on the other, with one of the peculiar comb-like organs, . . . the 

 latter being detached and lying in the matrix near the side of the 

 abdomen. 



"The cephalothorax seems to be subquadrangular in form, some- 

 what wider behind than long, the breadth being about 11.5 mm. 

 Unfortunately it is not in a condition to show the ocelli, nor can we 

 see whether or not its anterior edge is emarginate. It shows a minute 

 marginal line behind, from near which there originates a distinct 

 mesial furrow, wliich extends forward to near the middle, where it 

 is intersected by, or rather bifurcates into, two oblique furrows, 

 with the prominence for the mesial ocelli between them. Two other 

 rather deep lateral furrows extend, one on each side, from the pos- 

 terior end of the mesial one, obliquely outward, near the posterior 

 margin. The surface is ornamented with irregular scattering granu- 

 les, mostly upon the prominences between the furrows. The man- 

 dibles are stout, . . . but appear to be without teeth or serrations. 

 The movable finger is curved and sharp at the point. The legs are 

 rather stout, with most of the divisions long. Palpi unknown. 



"The abdomen is a little more than twice the apparent length 

 of the cephalothorax, or about 23.0 mm. in length, and 15.2 mm. in 

 breadth. Its segments gradually increase in their antero-posterior 

 diameter, from the front one backward to the seventh, which is about 

 twice and a half as long as the sixth or largest of the others (being 

 9.0 mm. long, and 12.3 mm. wide), subtrigonal in form, with the 

 posterior angle broadly truncated for the attachment of the tail, and 

 the anterior lateral angles a little rounded. The six shorter abdominal 

 segments, especially the anterior ones, have their front margin more 

 or less sinuous along the middle, and their lateral extremities more or 

 less rounded. They all have the surface a little granular, the granules 

 being very small and arranged mainly along the posterior margin. 

 The last, or subtrigonal one, also has on its posterior half, near the 

 middle, two longitudinal, parallel rows of minute pits or punctures. 



"Of the tail, only the anterior three segments are preserved in the 

 specimen. These show that it was rather stout, but as distinct from 

 the abdomen by its sudden contraction in breadth, and in the form 

 of its segments, as in the existing Scorpions. Its segments measure 

 as follows : first one, 6.5 mm. in length ,6.0 mm. in breadth ; second, 



