NEMASTOMOIDES. 



83 



posterior region. From the shape of the fossil and the great length of the 

 appendages I propose to identify it provisionally as : 



Nemastomoides elaveris, Thevenin. Text-figure 42. 



1902. Nemastomoides elaveris, A. Thevenin, Bull. Soc. G-eol. France [4], vol. i, p. 609, pi. xiii, fio-. 2. 

 1904. Nemastomoides elaveris, A. Fritsch, Palseoz. Arachn., p. 29, fig. 34. 



The carapace appears to be broad in front and to have the antero-lateral angles 

 subrectangular. Its anterior portion in front of the coxa? of the legs of the third 

 pair is higher in the middle than at the sides, and has a central longitudinal groove 



Fig. 42. — ? Nemastomoides elaveris, Thevenin ; suggested restoration of the dorsal surface, five times nat. size. — 



Coal Measures j Ellismuir. E. Dunlop Collection. 



posteriorly. The coxa? of the third and fourth pairs of legs do not appear to meet 

 in the middle line; those of the third pair diverge transversely in the same straight 

 line ; those of the fourth pair, about equal to them in size, diverge obliquely back- 

 wards, and between them there appears to be a triangular plate which must 

 probably be regarded as the first sternal plate of the opisthosoma seen vaguely 

 through the median area of the first tergal plate of that region. It is marked with 

 a pair of distinct tubercles, belonging probably to the sculpturing of the dorsal 

 surface. Behind this plate the outline and segmentation of the opisthosoma 

 are clearly seen. Its shape is semi-elliptical, being broad in front, gradually 

 narrowed and rounded behind. There are six distinct plates with their anterior 

 and posterior borders subparallel, each consisting of a median area and a pair 

 of uptilted pleural lamina?, as in typical Anthracomarti ; the pleural lamina? 



