68 TERRESTRIAL CARBONIFEROUS ARACHNIDA. 



the second sternal plate shorter but wider 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. 



Measurements in mm. — Total length 11 ; length of carapace 4*5, width about 4; 

 length of opisthosoma 6'5; median length of its first tergal plate about 13, 

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

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



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 opisthosoma 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 opistho- 

 soma 6" 5 mm., width 6 mm. 



(2) Another specimen in Mr. Priest's Collection has the opisthosoma 6 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 opisthosoma is 

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

 4*5, width 3 - 5; length of opisthosoma 5 - 5; length of second leg 5 - 5, of third 5 - 5, 

 of fourth 6" 3. 



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

 the dorsal surface, with the carapace incomplete. Total length about 11 "5 mm.; 

 length of opisthosoma 7 mm., width 7'5 mm. 



(5) Specimen in Mr. Egginton's Collection (No. 5) showing the anterior 

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

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

 leg 3 mm. 



In addition to No. 5, Mr. Egginton's Collection contains ten specimens of 

 Anthracomarti, most of which seem to belong to this species. 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. priesti. 



