On the Species of the Gemcs Palaeoxyris. 63 



segments is marked with very fine oblique lines, of 

 which Fig. 5a gives an enlarged drawing. These lines, 

 however, may be due to mineralisation. Lesquereux 

 unites with Palccoxyris Prendelii his Palceoxyris corrugata^ 

 but the specimen on which this latter species is founded 

 is badly preserved, and though it probably belongs to 

 Palceoxyris Prendelii, its state of preservation is so imper- 

 fect that the real characters for specific distinction are 

 entirely obliterated, and nothing further can be said than 

 that the fossil belongs to the genus Palceoxyris. 



Horizon. — Coal measures. 



Locality. — Clays Croft Openwork, Coseley, near Dudley, 

 Staffordshire. 



PALiEOXYEIS JOHNSONI, U.S. 



(PL L, Fig. 6.y 



Description. — Body broadly fusiform, about 5 cm. long and 

 1'5 cm. broad; segments about 60 in number, and very 

 narrow, on the centre of the body five segments occupy 

 3 mm., but at the extremities about ten occupy the same 

 space. The segments are very steep. 



Bemarhs. — This species is easily distinguished from all the 

 others by its numerous very narrow concave segments ; the 

 segments decrease in width from the centre of the body 

 towards each end. On the exposed surface marked {a) 

 thirty segments can be counted ; they here lie almost parallel, 

 and scarcely show any spiral twisting. The specimen is only 

 partially compressed, but on those parts where it has suffered 

 from pressure the rhomboidal markings are about 1 mm. long 

 and slightly less in width ; but their size, like that of the 

 segments, decreases from the centre towards the ends. 



I have only seen one example of this species, which is in 

 the collection of Mr Henry Johnson, F.G.S., Dudley, after 

 whom I have pleasure in naming it. 



Horizon. — Coal measures. 



Locality. — Coseley, near Dudley, Staffordshire. 



1 Report, Geol. Survey of Illinois, vol, iv., p. 466, pi. xxvii,, fig. 13. 



