SABELLARIIDAE 



177 



concentric rows of paleae, and the distinctive broad outer paleae (see Mcintosh, he. cit. 

 PI. XXV A, fig. 24) render it generically distinct from Ida 11 thyrsus. To some extent it 

 combines the characters of Sabellaria and Idanthyrsiis. 



Genus Idanthyrsus, Kinberg 

 Idanthyrsus armatus, Kinberg. 



Pallasia sexungulata, Ehlers, 1897, p. 125, pi. viii, figs. 194-202. 

 Idanthyrsus armatus, Johansson, 1927, p. 90. 



St. 51. 4. V. 26. Off Eddystone Rock, East Falkland Island. From 7 miles N 50° E to 7-6 miles 

 N 63° E of Eddystone Rock. 115 m. Gear DLH. Bottom: fine sand. Five specimens. 



St. 53. 12. V. 26. Port Stanley, East Falkland Island. Hulk of "Great Britain." 0-2 m. Gear 

 RM. Four specimens. 



St. WS 72. 5. lii. 27. 51° 07' 00" S, 57- 34' 00" W. 95 m. Gear OTC. Bottom: sand and shell. 

 One specimen. 



St. WS 77. 12. iii. 27. 51° 01' 00" S, 66° 31' 30" W. From 51° 00' 00" S, 66° 30' 00" W to 

 51° 02' 00" S, 66° 33' 00" W. 110-113 m. Gear OTC. Bottom: coarse dark sand. One specimen. 



St. WS 79. 13. iii. 27. 51° 01' 30" S, 64° 59' 30" W. From 51° 00' 00" S, 65° 00' 00" W to 

 51° 03' 00" S, 64° 59' 00" W. 132-131 m. Gear OTC. Bottom: fine dark 

 sand. " Found attached to large Mo/g'i//i(/fle." Six specimens. t2.i 



St. WS 85. 25. iii. 27. 8 miles S 66° E of Lively Island, East Falkland 

 Island. From 52° 09' 00" S, 58° 14' 00" W to 52° 08' 00" S, 58° 09' 00" W. 

 79 m. Gear OTC. Bottom: sand and shell. One specimen. 



St. WS 88. 6. iv. 27. 54° 00' 00" S, 64° 57' 30" W. From 54° 00' 00" S, 

 65° 00' 00" W to 54° 00' 00" S, 64° 55' 00" W. 118 m. Gear OTC. Bottom: 

 sand, shell and stones. Four specimens. 



St. WS 92. 8. iv. 27. 51° 58' 30" S, 65° 01' 00" W. From 52° 00' 00" S, 

 65°oo'oo" Wto5i°57'oo"S,65°02'oo" W. i45-i43m. GearOTC. Bottom: 

 fine dark sand and stones. A cluster of tubes with Serpulid vermidom and one 

 specimen. 



St. WS 95. 17. iv. 27. 48° 58' 15" S, 64° 45' 00" W. From 48° 57' 00" S, 

 64° 45' 00" W to 48° 59' 30" S, 64° 45' 00" W. 109 m. Gear DC. Bottom: 

 fine dark sand, stones and shell. Two specimens. 



Remarks. Ehlers has given a full account of this species. 

 Johansson claims that the outer paleae (Fig. 73) are characteristic. 

 They are certainly distinct from those of the allied /. pennatiis 

 (Peters) of tropical distribution. 



The specimens from St. 53 are very small, measuring 7-10 mm., 

 and I can find only two pairs of dorsal hooks instead of the 

 usual three. Otherwise they do not difi^er. I take them for young armatus. Outer palea. 

 specimens. 



The name Pallasia, Quatrefages, 1848, retained by Fauvel (1927, p. 206), appears to 

 be preoccupied hy Pallasia, Desvoidy, 1830, in Diptera, and is replaced hy Idanthyrsus, 

 Kinberg. 



O 



Fig. 73. Idanthyrsus 



