ANTHRACOSCORPIO. 23 



sense denticulated ; the superolateral crests are similarly granular, and granules 

 are irregularly scattered over the areas between the crests. 



The chelicerse are not well preserved, no details . of the dentition being 

 decipherable ; but the movable digit appears to be strongly arcuate. 



The chela3 are long and slender, somewhat recalling those of Ghelifer cancroides. 

 The humerus and brachium are subequal in length, and both, broadly speaking, 

 about four times as long as Avide. No trace of crests or granulation is preserved. 

 The mantis is slender and oval, its width being a little greater than that of the 

 brachium, and little more than half the length of the back of the manus. The 

 digits are slender, normally arcuate, the movable being about as long as the 

 carapace, brachium, or humerus. 



Portions of all the legs are preserved, showing the normal structure. Evidence 

 for the existence of tibial spurs is to be found on the fourth and fifth legs, as in 

 many genera of existing Buthidas ; but there also appears to be one on the first leg 

 — a character not present in any recent species of the order. On the second 

 leg of one side a pedal spur is also preserved. The femora, patellae, tibias and 

 protarsi are crested, and the femora at least are beaded with granules along their 

 upper and lower edges. The claws are not preserved. 



Approximate Measurements in mm. of Ttpe Specimen. 



Length of carapace 



20? 







j) 



abdomen 



40 







,, 



caudal segments 1 to 4 . 



50 







,, 



entire tail probably not less than 



70 







)) 



entire animal „ ,, „ 



180 







yy 



first caudal segment 



10-5 



; width of same 



11 



,, 



second „ ,, 



13; 



>> »> 



10-5 



j* 



third ,, 



13; 



>> j> 



10 





fourth ,, „ 

 humerus 



13; 

 21 



>> >! 



10 



,j 



brachium 



20; 



width of brachium . 



5 



,, 



back of the hand 



9; 



,, of hand 



6 





movable digit 



20 







In the above-given table the probable total length of the tail has been guessed 

 from the length of the fourth segment, 20 mm. being allowed for the fifth 

 segment and the vesicle, which are not preserved. These two missing segments 

 were probably not less, and may have been more than the amount supposed, since 

 the fifth caudal segment is never shorter and is usually longer than the fourth in 

 living Scorpions. 



The type and only known specimen of this species is contained on the two 

 pieces of a split shale from the Upper Coal Measures of Drumgray, near Airdrie, 

 in Scotland. It is in the possession of Mr. R. Dunlop, to whom I have dedicated 



