0. Harger—New Fossil Spider from the Coal Measures. 221 
to be owing to the accidents of its preservation. The presence 
or absence of spinnerets cannot be determined 
In considering the relations of this insect to previously 
known living and fossil forms, the more important points of 
structure to be regarded are, the segmentation of the abdomen 
and its union with the cephalothorax, the character of the palpi, 
the position and number of the eyes, and the cephalothoracic 
The segmented character of the abdomen seems to be beyond 
a doubt . J. H. Emerton, in a letter to Prof. Marsh, has 
called attention to an aberrant spider described by Schiédte, 
blance to that of Arthrolycosa, and it is perhaps not impossible 
that the segmented appearance in the fossil may have been 
the fossil by any other than the most natural and obvious 
ly segmented in its structure. 
small number of abdominal segments, apparently only 
seven at most, is an interesting point. If its segmented charac- 
rings, 
Unfortunately, in his description of Protolycosa anthraco- 
Phila,t Romer does not state distinctly whether the abdomen 
1S segmented or not. His figures indistinctly indicate nine or 
ten segments in its abdomen, while in the discussion of its 
fre seems to be no n 
cephalothorax and abdomen was as delicate as in 
* Naturhistorisk Tidsskrift, II, vol. ii, p. 617, pl. v, 1849. ee 
+ Neues Jahrbuch fir Mineral. Geol. u. Palaont. von Leonhard u, Geinitz, p. 
136, pl. mm. Stuttgart, 1866. 
