68 TERRESTRIAL CARBONIFEROUS ARACHNIDA. 



the second sternal plate shorter but wi<ler than the first, with its median area 

 elevated into a subcrescentic thickening which fits round the angle of the first ; 

 the third wider than the second, very short in the middle, thickened and notched 

 laterally, where it is hinged to the fourth. 



Meusnrf'))ient.s In iidii. — Total length 11 ; length of carapace 4*5, width about 4; 

 length of opistliosoma (r5; median length of its first tergal plate about To, 

 of seventh about 1 ; length of trochanter and fenuir of first leg almost 3, of the 

 rest of the limb 3"5; trochanter and femur of fourth leg o'o. 



Coseley, near Dudley. 



The type specimen above described is in the collection of Mr. S. Priest. 



In addition to the type I have seen many specimens in various stages of 

 preservation in the Collections of Mr. S. Priest, Mr. Henry Johnson, Mr. W. 

 Egginton, Dr. Hind, and Mr. J. S. Neil, all contained in clay ironstone nodules from 

 Coseley and Dudley. 



The following may be mentioned : 



(1) A perfect specimen of the opistliosoma from the dorsal side in Mr. Priest's 

 Collection. It differs principally from the type in having the median area of the 

 seventh tergal plate longer than its unpaired lamina. Total length of the opistlio- 

 soma 6*5 mm., width 6 mm. 



(2) Another specimen in Mr. Priest's Collection has the o})isthosoma G mm. long 

 and about 6' 3 mm. wide. 



(3) Specimen in Dr. Hind's Collection showing the same general features as the 

 type, but the sterna of the opisthosoma less well preserved and the second, 

 third, and fourth legs of the right side clearly traceable. The opistliosoma is 

 shortened by distortion. Measurements in mm. : Total length 10 ; length of carapace 

 4'5, width 3*5; length of opistliosoma 5"5; length of second leg 5'5, of third 5*5, 

 of fourth G"3. 



(4) Specimen in the British Museum collected by Mr. J. S. Neil and showing 

 the dorsal surface, with the carapace incomplete. Total length about llo mm.; 

 length of opisthosoma 7 mm., width 7'o mm. 



(5) Specimen in Mr. Egginton's Collection (No. 5) show^ing the anterior 

 sternal plates of the opisthosoma nearly as clearly as in the type. Total length 

 about 12 mm., of which the opistliosoma is 7 mm ; trochanter and femur of fourth 

 leg 3 mm. 



In addition to No. 5, Mr. Egginton's Collection contains ten s})ecimens of 

 Anthracomarti, most of which seem to belong to this sj)ecies. Some, however, 

 are of doubtful identity. The three following are selected for measurement on 

 account of their small size : No. 26, total length 9 mm. No. 52, total length 

 7 mm. ; length of opisthosoma 4*5 mm. No. 32, total length 5 mm. ; length and 

 width of opisthosoma about 3 mm. ; length of first leg 3 mm. These may be young 

 specimens of A. piesti. 



