506 Dr. L. Mo y sen — Coal-measure Arthropods. 



projecting quadrilateral plate normal to this segment in most of the 

 Anthraconiarti. 



The ahsence, or at least imperfection, of the anterior segments 

 makes it extremely difficult to refer this Arachnid to its proper genus. 

 It probably belongs to the order Anthracomartus of Pocock, and with 

 some hesitation we may refer it to the genus Trigonotarhus. It is 

 evidently, however, a new species, and it would be, at present, best 

 not to name it definitely, but to leave it in the hope that some 

 experienced arachnologist may in the future be able to give it a place 

 in the now rapidly growing list of Carboniferous spiders. 



In conclusion, it would be well to describe in some detail the 

 locality from which so many of these and other rare or new fossils 

 have been obtained, that it ranks with the Coseley Openworks near 

 Dudley, and the Sparth Bottoms Brickfield, llochdale, as one of the 

 main sources of enrichment of our Coal-measure fauna. The spot in 

 question is the Shipley Clay-pit, about 1^ miles north of Ilkeston, 

 Derbyshire, situated on the Shipley Manor estate, and owned by 

 E. H. Mundy, Esq., to whom, for his kindness in giving me opportunity 

 to examine the nodules it contained, I am deeply indebted. The pit, 

 which covers some two acres of ground, was opened in the yellow 

 clays in the neighbourhood of the Top Hard Coal, probably some 

 30 to 40 feet below that seam. The clays abound in ironstone nodules,, 

 arranged in bands, every one of which, when broken, reveals the 

 presence of some organism, either plant 1 or animal, in a perfect or 

 fragmentary condition. It was found, however, that nodules which 

 were more or less symmetrical, either round or ovoid, usually contained 

 the most perfect specimens. To such an extent was this the case 

 that, latterly, symmetrical nodules were collected and brought home 

 to. be broken at leisure by freezing or by other means, with most 

 satisfactory results. Unfortunately the clay-pit is now disused and is 

 totally obliterated by being filled with waste from an adjoining mine. 



The following is a list of the animals obtained from the clay -pit; 

 and it is curious to notice, purely as a coincidence, how closely it can 

 be compared with a similar list given by Mr. W. Baldwin 2 for the 

 Sparth Bottoms Clay-pit : — 



AKTHEOPODA. Xylobius sp. 



Crustacea — Arthropleura, sp. nov. 3 



Phyllopoda : Leaia trigonioides, A. armata, Jordan. 



sp. nov. 



SCHIZOPODA : Prceanaspides prce- INSECTS. 



cursor, Woodward. Insects' wings 4 with Blattoid and 



Myriapoda : Lithomantid affinities. The latter, 



Xylobius cf. spinulosa. gen. et spec. nov. 



1 For list of plants found in this clay-pit see a paper by Mr. E. A. Newell 

 Arber in the Proceedings of the Yorkshire Geological Society, vol. xvii, pt. ii, 

 pp. 132-55, pis. xii-xix, 1910. 



2 W. Baldwin, "Fossil Myriapods of the Middle Coal-measures, Sparth": 

 Geol. Mag., Dec. V, Vol. VIII, p. 75, 1911. 



3 Professor Woodward has kindly undertaken to describe this specimen at 

 a later date. 



4 Mr. H. Bolton has kindly undertaken to name and describe these wings at 

 an early date. 



