CHITON. 407 



Middendorff describes the branchiae of G. alius as not 

 extending beyond the centre of the foot, and as being 

 about twenty in number on each side. 



This species has possibly been confounded with its 

 near allies on some parts of the coast, so that it is 

 difficult to ascertain its true range. Authentic specimens 

 are all from the North ; among the Hebrides (Lowe, 

 Jeffreys, Barlee) ; in the Orkneys (Thomas) ; Lerwick and 

 Scalloway, Zetland, in ten to twenty fathoms (Jeffreys) ; 

 and on the north coast of Ireland (W. Thompson) ; there 

 is reason to believe that it is not a common Chiton. It 

 appears to be generally distributed through the Boreal and 

 Arctic Seas. 



C. asellus, Chemnitz. 



Depressed, rather broad, subcarinated, generally ash-coloured ; 

 granulations of the central areas disposed in longitudinal monili- 

 form rows. 



Plate LIX. fig. 1, 2, and (Animal) Plate AA, fig. 5. 



Chiton asellus, Chemn. Conch. Cab. vol. viii. p. 290, pi. 96, f. 816 (fide Loven). 



— Lowe, Zoolog. Journ. vol. ii. p. 101, pi. 5, f. 3, 4. — Brown, 



Illust. Conch. G. B. p. 66, pi. 21, f. 19.— Spengi,. Skriv. Nat. 



Selsk. Kiobenh. vol. iv. pt. 1, p. 99 (fide Loven). — Desh. Lam. 



Anim. s. Vert. vol. vii. p. 506. — Middend. Malac. Rossic. 



Chiton, p. 122. 



„ minimus, Chemn. Conch. Cab. vol. viii. p. 289, pi. 96, f. 814 (fide Loven), 



from which Wood, Gen. Conch, p. 19, and Dillw. Recent 



Shells, vol. i. p. 10. 



„ cinereus, Mont. Test. Brit. p. 3. — Turt. Conch. Diction, p. 34. — Fleming, 



Brit. Anim. p. 289. — Forbes, Malac. Monens. p. 37, animal, 



— Johnston, Berwick. Club, vol. ii. p. 38. — Brit. Marine Conch . 



p. 128.— Macg. Moll. Aberd. p. 184.— Dillw. Recent Shells, 



vol. i. p. 12 (in part). — Sowerby, Conch. 111. Chiton, sp. 4, 



f. 95 to 98. — Gould, Invert. Massach. f. 22? — Reeve, 



Conch. Icon. vol. iv. Chiton, pi. 28, f. 191. — Loven, Index 



Moll. Scand. p. 27. 



„ alhus, Maton and Rack. Trans. Linn. Soc. vol. viii. pi. 1, f. 4 (probably). 



Owing to the great confusion which has taken place 



