ATTHEYELLA. 59 



twisted at the base, and the larger pair are shortly 

 plumose. Length -^g-rd of an inch ('77 mm.). 



Male unknown. 



A very few specimens only were found in an old 

 engine-pond at Murton Junction, near Sunderland ; 

 and a single example, which appears to belong to the 

 same species, occurred in a gathering sent to me by 

 Mr. David Robertson from an old canal at Peterhead. 

 The fifth foot of this latter specimen is represented at 

 PI. XLIII, fig. 18, and differs slightly from that of the 

 Murton specimens. More recently (July, 1877) I have 

 found A. spinosa in a gathering taken amongst weeds 

 in the river a little west of Pwllheli, Caernarvonshire, a 

 situation where it is quite possible that sometimes the 

 water may become brackish, though at the time of 

 my visit it was not perceptibly so. I at first sup- 

 posed these specimens to belong to Fischer's Cantho- 

 camptus horridus, to which they bear a very close 

 resemblance, but Fischer's figure distinctly represents 

 the first foot with a much elongated inner branch, 

 from which I infer that it cannot be identical with the 

 present species, which seems to be generically distinct 

 from Canthocamptus. I propose, therefore, for its 

 reception a new genus named after my friend Mr. 

 Thomas Atthey, of Grosforth, near Newcastle, to 

 whom we are indebted for the discovery of the next 

 species (A. cryptorum), and who, by his intelligent and 

 unwearying labours amongst the fossils of the Nor- 

 thumberland coal-field, together with an unsurpassed 

 manual skill in the preparation of his specimens, has 

 done so much for that branch of science.. 



