506 ARICIA NORVEGICA. 



twenty-third the foot has dorsally on each side of the median line the broadly lanceolate 

 branchia, then the elongated dorsal lobe, which is shaped somewhat like a pointed shoe, 

 with a tuft of slender, tapering, serrate (camerated) bristles, amongst which are some 

 simple forms, and with four spines. In the interval between this and the ventral division 

 is a short and rather broad conical papilla. Then the bifid ventral lobe follows with a 

 somewhat clavate setigerous region supported by two spines, and a pointed lanceolate 

 lobe in front of it. The bristles were almost wholly abraded, but such as remained 

 conformed to the elongated slender forms with finely tapered tips and minute serrations 

 directed distally. 



At the base of the ventral division is a bluntly pointed lamella apparently 

 homologous with the ventral cirrus. 



No forked bristles were observed, but the condition of the examples was not 

 favourable. 



This form, therefore, differs from the Aricia Kupfferi of Bhlers in the occurrence of a 

 short cirrus between the dorsal and ventral lobes, though it also has hastate spines in the 

 last three feet of the anterior region. It likewise differs from A. norvegica in having 

 the intermediate cirrus, and in the shape of the ventral cirrus. 



5. Aricia norvegica, If. Sars, 1873. Plate LXV, fig. 3— head; Plate LXXXV, figs. 

 9-9 b— bristles ; Plate LXXXVII, figs. 2 and 2 a— feet. 



Specific Characters. — Head a short cone as in the type. Anterior region of the body 

 has fifteen bristled segments. Branchiae commence on the fifth. Dorsal cirrus flattened, 

 slightly enlarged towards the base, and tapered distally. Anterior rows of ventral 

 bristles pale, the last three or four feet with dark brown hastate spines. Rows of papillse 

 behind the foot more acutely pointed than in the previous forms, and eight to twelve in 

 number (Sars). Form and colour as in A. Cwvieri (Sars). At the twenty-third foot the 

 dorsal division has four or five spines and a long tuft of slender bristles with finely 

 tapered serrated tips. The cirrus is narrow and has a tapered extremity. The ventral 

 division has one spine and a small group of equally slender bristles, the tips of which are 

 serrated. The blunt setigerous lobe has a conical lobe to its outer side, whilst at the 

 base externally is a conical ventral cirrus nearly equal in size to the last mentioned. 



Synonyms. 

 1871. Aricia norvegica, M. Sars. Yidensk.-Selsk. Forhandl. for 1871, p. 5 (sep. copy). 



1873. „ „ idem. Bidrag Christ. Fauna, iii, p. 36, Tab. xvi, f . 1 — 8. 



1874. „ „ Malm. Goteb. vet. o. vitt. HandL, xiv, p. 91. 



1875. „ „ Mobius. Jahresb. Comm. deutsch. Meere, p. 160. 



1877. „ groenlandica, Mcintosh. Trans. Linn. Soc, Zool., i, p. 504, pi. lxv, f. 5—9. 



1879. „ norvegica, Tauber. Annul. Danic, p. 106. 



„ „ Hansen. Nyt Mag. f. Naturvid., xxiv, p. 269. 



1893. „ „ ' Levinsen. Vidensk. Ud. " Hauchs," p. 336. 



1905. „ „ Mcintosh. Ann. Nat. Hist., ser. 7, vol. xv, p. 44. 



Habitat— Hi. Magnus Bay, Shetland (J. G. Jeffreys). 



