ANTHRACOMARTUS. 



67 



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

 opisthosoma 0, width about 8. 



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



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



Carapace apparently a little longer than wide, its median length ecpial 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 

 bordei's with approximately the same curvature as in A. Iiiiuli; length of median 



Fig. 33. — Anthracomartus pricsti,sp n. ; dorsal surface, 

 restored from several specimens, fciiir times nat. 

 size.— Coal Measures ; Coseley, near Dudley. 



Fig. 'Si. — Suggested restorati<)n of ventral surface of 

 the same. 



area of first })late 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 laminas 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 })alpi doubtful. Trochanter and fem\ir of first leg aliout ef[ual to the 

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

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



First sternal ])late 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 })rominence of the plate ; 



