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On the remains of a giant isopod PRjEARCTURUS GIG AS, 



(H. Woodward) from the old red sandstone of rowlestone 



QUARRY, HEREFORDSHIRE. 

 BY HENRY WOODWARD, F.G.S., F.Z.S., of the British Museum. 



During the Meeting of the British Association at Exeter, in August, 1869, 

 Dr. Mc'Cullough, of Abergavenny, exhibited some portions of a most remarkable 

 fossil from the Cornstones of Rowlestone, Herefordshire, which (after a cursory 

 examination) I ventured to state were, — I believed — parts of a species of Stylonu- 

 rus, equal in size to the great Stylonurus Scoticus, from the Old Red of Forfar- 

 shire (described by me in the Quart. Journ. Geol. Soc. Lond., I860., Vol., 

 xxi. p. 484. PL siii.] 



Last year Dr. Mc Cullough was so kind as to send the fossil remains in 

 question up to London, with the request that I would examine the same and 

 report upon them to the Woolhope Club. 



The fossil-remains about to be described are delineated by Dr. Bull, with 

 his accustomed fidelity, in the accompanying Sketches Nos. 9 and 10. 



Sketch No. 9 represents the dorsal and ventral aspects of what is evidently 

 the body-segment of a large Crustacean, having its upper surface (Fig. 1 A. ) 

 ornamented with tubercles and exhibiting along its most perfectly preserved 

 anterior border (a) the smooth rounded margin which was inserted beneath the 

 next preceding segment, of which however no trace remains. 



The underside (Fig. 1 B) exhibits the basal joints of what were probably a 

 pair of ambulatory or natatory feet (n, nj belonging to the segment seen in Fig. 

 1 A. ; whilst the remains of a second and exactly similar pair (0, o,J once 

 attached to a lost posterior segment, can also be readily made out. 



In Sketch No. 10 is represented three other remains, obtained with the 

 preceding, and evidently parts of Cimfcaceau appendages ; being moreover orna- 

 mented in a similar manner to the dorsal surface of the segment in Sketch 9, 

 they may with propriety be referred to the same animal. 



