144 



DISCOVERY REPORTS 



Family ARICIIDAE, Savigny 



Genus Aricia, Savigny 

 Aricia marginata, Ehlers. 



Ehlers, 1897, p. 95, pi. vi, figs. 150-156. 



Benham, 1921, p. 77. 



Nainereis marginata, Fauvel, 1916, p. 445, pi. viii, figs. 26-33, ^^''^^ synonymy. 



St. 45. 6. iv. 26. 2-7 miles S 85° E of Jason Light, South Georgia. 238-270 m. Gear OTL. 

 Bottom: grey mud. Seventy specimens. 



St. 141. 29. xii. 26. East Cumberland Bay, South Georgia. 200 yards from shore, under Mount 

 Duse. 17-27 m. Gear BTS. Bottom: mud. Fourteen specimens. 



St. 144. 5. i. 27. Off mouth of Stromness Harbour, South Georgia. From 54° 04' S, 36° 27' W 

 to 53° 58' S, 36° 26' W. 155-178 m. Gear N 4-T. Bottom: green mud and sand. One specimen. 



St. WS25. 17. xii. 26. Undine Harbour (North), South Georgia. 18-27 m. Gear BTS. Bottom: 

 mud and sand. Nine specimens. 



St. WS 62. 19. i. 27. Wilson Harbour, South Georgia. 26-83 m. Gear BTS. Five specimens. 



St. MS .'' 24 or 25. 13. iv. 25. East Cumberland Bay, South Georgia. (No further information.) 

 Fourteen specimens. 



Remarks. I have examined a large series of examples of this species, which is common 

 off South Georgia. The number of thoracic chaetigers varies between 11 and 14, but 

 the greater part have 13 thoracic chaetigers. 



The appearance of the gills on the 6th chaetiger is an almost constant character : in 

 one specimen examined they begin on the 9th chaetiger. The three rows of spines in 

 the ventral rami of the thoracic feet are also constant in my specimens. I find no 

 capillary bristles in the ventral thoracic rami. Forked bristles are present in the 

 abdominal region. 



Aricia ohlini, Ehlers, with its 19 or 20 thoracic segments, is a very closely allied species. 



Aricia michaelseni, Ehlers. 



Ehlers, 1897, p. 88, pi. vi, figs. 136-140. 



St. 56 ?. 16. V. 26. Sparrow Cove, Port William, East Falkland 

 Island. I m. Gear RM. One specimen. 



Remarks. A single specimen measuring 65 mm. by 2 mm. 

 and incomplete posteriorly. There are 22 thoracic segments 

 and the gills begin on the 6th chaetiger. Ehlers gives 

 17 to 19 thoracic segments and the 5th for the gills. There 

 are about 12 papillae on a mid-thoracic foot. The ventral 

 papillae begin on the 14th chaetiger and continue to the 

 23rd. The rows are single and contain a maximum of 

 about 15 papillae. At the 14th chaetiger a great change 

 comes over the thoracic neuropodia (Fig. 54). Four or five 

 spear-headed chaetae appear, arranged in a transverse row, 



Imm 



^O 



Fig. 54. Aricia tnicliaelseiii. 

 Fifteenth thoracic foot. 



