E. Leonard GUI — Carboniferous Arachnid from Lancashire. 395 



There are also fossil remains of the shearwater ( Puffinus obscurus, 

 Hurdis & Reid ; Auduboni, Pinseh) from Smith's parish. Mr. L. L. 

 Mowbray, the curator, has mounted the sternum found alongside of 

 the recent skeleton of the shearwater, with whose measurements the 

 fossil agrees. 



EXPLANATION OP PLATES. 



Plate XVIII. 



Map of Bermuda, showing principal points touched on in the paper. Drawn by 



Mrs. Bullen. 



Plate XIX. 



Fig. 1. Sand-dune 'anchored' by sea-lavender (Touriiefortia gnaphaloides, 



E. B.). 



,, 2. Sand-dune ' anchored ' by indigo-berry (Randia aculeata, L.). 



Both Figs. 1 and 2 from Warwick Long Bay, south shore. 



Plate XX. 



,, 1. Becent landslip, Paget formation, Kempe's Bay, Warwick parish, 



south shore. 

 ,, 2. Serpuline ' atolls ', south shore. 



(To be concluded in the October Number.) 



II. — A Carboniferous Arachnid from Lancashire. 



By E. Leonard Gill, M.Sc, Curator of the Hancock Museum, 

 Newcastle-upon-Tyne. 



rpHE specimen represented in the accompanying figure was obtained 

 1 from the Coal-measures of Westhoughton, near Eolton, Lancashire, 

 and has been kindly lent to me by Mr. Thos. Miclgley, of the Chadwick 

 Museum, Bolton. It is the nearly complete abdomen (opisthosoma) 

 of an arachnid of the order Anthracomarti. The concavity of the outer 

 margins of the pleural laminse, producing the scalloped outline 

 shown in the figure, indicates at once that the specimen must be 

 assigned to the family Brachypygidse 1 ; but it is less obvious to what 

 genus it may belong. Mr. Pocock's monograph (see preceding 

 footnote) gives only two genera as known in the family, namely 

 Brachypyge, Woodward, and Maiocercus, Pocock. Comparison between 

 these two is rendered difficult by the fact that of the former only the 

 dorsal surface is known, of the latter only the ventral ; of neither has 

 any part but the opisthosoma yet been recognized. Accordingly, in 

 differentiating his genus Maiocercus from Brachypyge, Mr. Pocock 2 

 was compelled to fall back upon two characters — the general shape of 

 the opisthosoma and the angles made by the anterior pleural laminse. 

 Brachypyge is defined as having the " opisthosoma much longer than 

 Avide ; pleural laminae of the second and third pleura-bearing terga 

 inclined slightly backwards " ; Maiocercus as having the " opisthosoma 

 much wider than long ; pleural laniinse of the first, second, third, and 

 fourth sterna inclined slightly forwards". 



These definitions fail when applied to the present specimen, for 

 though on the whole the inclinations of the pleural lamin as agree with 



1 See B. I. Pocock, "Terrestrial Carboniferous Arachnida of Great Britain " : 

 Palffiontographical Society, vol. lxiv, p. 58, 1911. 



2 Loc. cit., p. 59. 



