270 Geologic range of the Pterygotus problematicus. 



the restoration of the " lobster' 1 by the great ichthyologist 

 himself. 



Nearly allied to the Scotch fossil and the recent Limulus of 

 the West Indies, is the Pterygotus problematicus of the Silu- 

 rian rocks of England, and the object of this paper is to draw 

 the attention of geologists to the remarkable range of that 

 crustacean, and the association of a highly-organized Ento- 

 mastracan with groups of fossils so widely separated as are 

 the trilobites and mollusks of the " Caradoc conglomerate" 

 from the ichthyolites of the " Old Red Sandstone." 



In the collection of the Malvern Natural History Field 

 Club is a portion of one of the " thoracic feet," discovered by 

 Mr John Barrow, in the Caradoc conglomerate of Eastnor 

 Park. This fossil is alluded to by Sir R. Murchison (Siluria, 

 p. 237), to whom the circumstance of its detection was com- 

 municated by the late Mr Hugh E. Strickland. It is associ- 

 ated with Lingula crumena, Lingula attenuata, Area Eastnori, 

 and Pterinea orbicularis. 



Another "thoracic foot" was found by the writer of this 

 notice at the base of the Upper Ludlow shales at Gorstley 

 Common, Newent, Gloucestershire, and was examined and 

 named by Mr J. W. Salter. Rhynconella Wilsoni occurs in 

 the same rock ! 



The fine specimen of the limbs of this Palaeozoic crustacean 

 in the cabinet of the late Mr H. E. Strickland, has been fully 

 described (Quart. Journ. Geol. Soc, Nov. 1852, vol. viii.) 

 by Mr J. W. Salter. The locale of this fossil was in close 

 proximity to the Upper Ludlow "bone bed" of Hagley Park, 

 near Hereford ; and it was discovered associated with Avicula 

 retroflexa, Orthis lunata, and Orbicula rugata by the late 

 Mr Mackay Scobie. 



A few weeks ago I examined a fine collection of the remains 

 of Pterygotus in the cabinet of Mr R. Banks of Kingston, from 

 the ■• tilestones" of Bradnor Hill. One of the claws of this 

 animal is superior to the fossil of Hagley Park, while thoracic 

 feet, spines, and the plates figured (Sil. System, PI. IV., 4 a), 

 occur in great abundance. The only fossil hitherto detected 

 in the " tilestones," with the remains of Pterygotus, is Lingula 

 cornea. The " Arbroath paving-stones" of the Old Red Sand- 

 stone contain numerous fossils of the same crustacean (Siluria, 



