60 TERRESTRIAL CARBONIFEROUS ARACHNIDA. 



of the second ; it lias no laminae, but bears two widely separated tubercles. A 

 pair of similar but larger tubercles is present on the elevated median area of the 

 six following terga. The second tergal plate is large ; its pleural lamina? are 

 distinct, with their postero-lateral portion inclined outwards and slightly back- 

 wards. The pleural laminge from the third to the seventh are Avidely extended 

 laterally and divided by a distinct sulcus into an external and internal moiety. 

 The median area of the terga is narrow as compared with the same area in 

 Antliracomarfiis. The median area of the eighth tergal plate is very long and the 

 inner moieties of the pleural laminae are not differentiated. In this respect 7>. 

 carhonis differs from all the other members of the Anthracomarti hitherto 

 described ; and it is the elongation of the tergal plate which gives the charac- 

 teristic length to the opisthosoma. 



(hims MAIOCERCUS, nov. 



Characters as above (p. 59). 



Tijpe Species. — Maiocercus celticus, Pocock. 



Pig. 29. — Maiocercus celticus (Pocock); ventral surface of opisthosoma, nat. size. — Coal Measures ; Ty'nyboclw, 

 Rhondda Valley, S. Wales. 1 st. to 9 st., sterna of the first to the nintli somites ; 8 ty., ventral side 

 of median lamina of the last tergal plate visible on the dorsal side ; t(j., area regarded as the tergal 

 plate of the ninth somite ; lU tg., anal operculum or tergal plate of tlie tenth somite ; imp., impression 

 (? coxal) marking the first and second sternal plates. From Geol. Mag. [-1], vol. ix, p. 491. 



Maiocercus celticus (Pocock). Text-figure 29. 



1896. Eophrynus carhonis, F. T. Howard and T. H. Thomas, Trans. Cardiff Nat. Hist. Soc, vol. 



xxviii, p. 52, figs, a aud b (nee Woodward). 

 1902. Brachypyfje celtica, R. I. Pocock, Geol. Mag. [4], vol. ix, p. 488, fig. 2 a. 

 1904. Brachypij(je celtica, A. Fritsch, Palaeoz. Araclin., p. 41. 



The figure of the ventral surface of the opisthosoma of this species suggests 

 that the genus Maiocercus is much more closely allied to Anilimcomartus than is 

 Brachypyge. The chief resemblance to Bracliijpyrie lies in the scalloped edge of the 

 pleural laminge. There is no reason to suppose that the eighth somite is elongated 

 as in the latter. The posterior borders of the sixth and seventh sterna show the 



