Reviews — Griffith 8f Brydone — Zones of the Chalk, Hants. 177 



Anthracomarti, an extinct group formerly included in the Opiliones, 

 but regarded \>y Pocock as a distinct Order. The Phalangiotarbi are 

 also given ordinal rank, and a new Order, Haptopoda, is established 

 for a species to which the name Plesiosiro Madeleyi is given. It is 

 pointed out that these three Orders may possibly " serve to bridge, to 

 a certain extent, the interval between the Opiliones and the more 

 primitive Orders of Arachnida ". 



The other Orders represented in the Carboniferous fauna are the 

 Scorpiones, Pedipalpi, Aranese, Bicinulei, and perhaps also Opiliones. 

 So far as the evidence of the fossils goes, the members of these Orders 

 seem to have resembled, to a remarkable degree, those existing at the 

 present day, and they serve to illustrate once more the extreme 

 antiquity of living types of invertebrate animals. A few of the forms, 

 however, show characters of great morphological interest, the most 

 striking being those presented by a scorpion to which the name 

 Eobutlius Itolti is given. In addition to some peculiarities, of which 

 the significance is not quite clear, in the region of the genital somite, 

 this scorpion differs fx'om nearly all those hitherto known in having 

 the ventral plates of the fourth, fifth, and sixth somites of the abdomen 

 each with the hinder margin divided into two semicircular lobes over- 

 lapping the succeeding somite. As Mr. Pocock points out, these 

 bilobed overlapping plates have "a general resemblance to the gill- 

 bearing appendages of the same segments in Limulus", and, as he 

 was unable to find any trace of stigmata upon them, he concludes 

 "that the respiratory lamelke lay beneath them as they do in 

 Limulus". He remarks that "in possessing these lobate sternal 

 plates the Scorpion now described is more like Limulus than is the 

 Silurian Scorpion Palceophonus ". It is quite possible, however, as 

 Mr. Pocock himself suggested in describing the Scottish Silurian 

 Scorpion some years ago, that the supposed mesosomatic 'sternites' 

 of Palceophonus are really broadly laminate gill-bearing appendages, 

 as they have been shown to be in Eurypterus. If this should prove 

 to be so it would reduce the difference in this respect between 

 Eohuthus and Palceophonus to the fact that in the former the appendages 

 are lobate as in Limulus, while in the latter they are square-cut as in 

 Eurypterus. At all events there can be no question as to the extreme 

 interest and importance of Eohuthus from this point of view, and it is 

 to be hoped that collectors will be induced to keep a look out for more 

 perfect specimens which will throw further light on its structure. 

 W. T. C. 



II. — The Zones of the Chalk in Hants. By C. Griffith, M.A., 

 F.G.S., and P. M. Bkydonk, B.A., F.G.S. 8vo ; pp. 36, with 

 4 plates. Dulau & Co., 37 Soho Square, London, W., 1911. Price2s. 



Ij^OR more than twenty years Mr. Brydone has been studying the 

 Chalk of Hampshire and its fossils, at first while a pupil at 

 Winchester College under the guidance of Mr. Griffith, and afterwards 

 in collaboration with him. The pi'esent work, while embodying the 

 results of their joint labours, has been drawn up by Mr. Brydone. 



We have also before us the neat little booklet prepared in 1891 by 

 Mr. Griffith for the Winchester College Natural History Society, and 



DECADE V. — VOL. VHI. — NO. IV. 12 



