ANTHRACOMARTID.E. 61 



mesial angular notch present in Aatliracoinartni^, but the first and second sternal 

 plates are not enlarged and posteriorly produced as in Anthracomartn-s. There is, 

 however, on each side of them a distinct impression which I suggested in 1002 

 indicated possibly the position of the coxa3 of the legs of the last pair. 



Familii ANTHRACOMAETiD.i:, Haase. 



(= Aiithracomarf{i1;e + Proini/galkhe, Fritscli.) 



Carapace of prosoma not differentiated into definite regions as in the Eophry- 

 nidee, at most marked by a single posterior transverse sulcus. Chelicera3 not 

 certainly known, but apparently very slender, with thin, rod-like basal segments. 

 The remaining appendages normal, with their basal segments arranged subradially 

 round a wide sternal area ; sternal plate unknown. Opisthosoma with its lateral 

 and posterior borders forming a continuous widely-rounded curve, exhibiting eight 

 tergal plates on the dorsal side ; the first very short, narrowed laterally, without 

 pleural laminse, and partially or Avholly overlapped by the posterior border of the 

 carapace ; the rest with very large pleural laminas, divided into an outer and an 

 inner plate by sulci ; these sulci form a continuous series passing round the 

 opisthosoma in a line concentric with the lateral and posterior borders, starting at 

 the antero-lateral angles of this region in front and cutting posteriorly the unpaired 

 median pleural lamina of the last tergal plate on the dorsal side. The median 

 area of the first large pleura-bearing tergal plate usually widened in front. In the 

 posterior half of the opisthosoma the pleural lamince are directed obliquely back- 

 Avards, so that the posterior borders of the terga form a strongly curved line, 

 concave backAvards. 



On the ventral surface nine sternal areas are distinctly traceable in front of the 

 anal operculum. The posterior borders of the fifth to the eighth are strongly 

 recurved and notched in the middle line, giving a marked and characteristic 

 angular appearance to these plates. The first visible sternal plate, no doubt the 

 genital operculum, is large and wide, with concave anterior border and a more or 

 less angularly produced posterior Ijorder. It lies well behind the coxa) of the 

 posterior limbs of the prosoma and is in no sense wedged in between them as in the 

 Eophrynidaj. Usually, at all events, it has a median ridge or prominence. The 

 second and third plates follow, roughly speaking, the curvature of the first, their 

 posterior borders being convex backwards. The third plate is sharply marked 

 off from the fourth by what appears to be a strong hinge. Passing obliquely back- 

 wards and inwards from the lateral portion of the third plate towards the anal 

 operculum, there is, on each side, a strong ridge. The sternal areas between these 

 ridges are depressed so that the middle of the ventral surface behind the third 

 sterna] plate is arched. Outside these ridges the ventral surface is sloped obliquely 



