ANTHRACOMARTUS. 67 



plate, of the opisthosoma. Measurements in mm.— Total length 13; length of 

 opisthosoma 9, width about 8. 



All the above -described specimens are from Coseley, near Dudley. 



Anthracomartus priesti, sp. nov. Text-figures 33, 34. 



Carapace apparently a little longer than wide, its median length equal to that 

 of first six and half the seventh tergal plates of the opisthosoma ; both these areas 

 granular or coriaceous throughout. The first tergal plate of the opisthosoma large, 

 its median length equal to that of the second and third taken together ; the median 

 lengths of the second, third, fourth, fifth and sixth subequal ; their posterior 

 borders with approximately the same curvature as in A. hindi; length of median 



Fig. 33. — Anthracomartus priesti, sp n. ; dorsal surface, Fig. 31. — Suggested restoration of ventral surface of 



restored from several specimens, four times nat. the same, 



size. — Coal Measures ; Coseley, near Dudley. 



area of first plate less than one-half its posterior width ; of the second a little more 

 than one-fourth of its posterior width ; of the sixth distinctly less than one-half its 

 posterior width ; median length of the seventh a little less than that of the first, 

 and much less than its own anterior width ; the triangular lateral laminae of this 

 segment nearly equal-sided ; median length of the median unpaired lamina about 

 equal to that of the seventh tergal plate itself. 



Length of palpi doubtful. Trochanter and femur of first leg about equal to the 

 median length of the first, second, third, and half the fourth terga of the opistho- 

 soma ; of fourth leg about ecpial to the first five terga of that region. 



First sternal plate large and triangular, its posterior median angle nearly 

 rectangular, the median area of the plate marked apparently with a somewhat 

 arrow- or hammer-shaped crest, the handle or shaft lying in the middle line, and 

 the head expanding laterally just in front of the angular prominence of the plate ; 



