82 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



into their neighbour's shaft. Tracing their course, 

 we see that as soon as they find themselves approach- 

 ing the burrow of another, they dip down below it 

 or go above it. Where the straight onward course 

 is found impracticable, they curve round and work 

 outwards. As two of these animals are sometimes 

 found in one bore, it may be inferred that they may 

 not be altogether solitary workers ; but whether 

 they are there for mutual assistance or as sexual 

 associates I have not had the opportunity of deter- 

 mining. 



Family ARCTURIDJS. 



Genus Arcturus, Latreille. 



arcturus longicornis, Sowerby. 



Oniscus longicornis, Sowerby, Brit. Misc., t. 19. 



Arcturus longicornis, Westwood, Trans. Ent. Soc 

 Lond., i., 72, t. 16. 



Astacilla longicornis, Fleming, Edin. Enc, vii., p. 502. 



Leachia lacertosa, Johnston, Edin. Phil. Jour., xiii.„ 

 p. 220. 



Habitat. — Taken frequently in the dredge at various 

 depths ; off Fairland Point, in 15 fathoms, bottom 

 mud and gravel ; off the Tan Buoy, towards Bute, 

 in 20 fathoms, mud and dead shells; off Skelmorlie 

 Point, in 39 fathoms, mud and gravel ; off Gantloch 

 Beacon, in 35 fathoms, mud, stones, and zoophytes ;; 

 and off Skate Island, Loch Fyne, in 105 fathoms,, 

 bottom soft mud. I have also had this species from 

 a fisherman, brought up on his long line. It has 

 been taken in the Firth of Forth by Mr. H. Goodsir ; 

 off Cullercoats, coast of Northumberland, Dr. Clarke; 

 Plymouth, Bate and Westwood. 



ARCTURUS GRACILIS, Goodsir. 



Leachia gracilis, Goodsir, Edin. New Phil. Jour.,, 

 xxxi., p. 310, pi. 6, f. 4. 



Arcturus gracilis, White, Cat. Brit. Crust., p. 64. 



Arcturus gracilis, Spence Bate and Westwood, Hist- 

 Brit. Sessile-eyed Crust. (1868), vol. ii., p. 373. 



