TEREBELLIDAE 



187 



Remarks. The largest specimen measures 76 mm. by 4 mm. There are several tubes 

 with the characteristic lateral projections. In my opinion Benham (1921, PI. ix, figs. 97, 

 98), in his figures drawn to show the arrangement of the lateral , 

 lobes, greatly exaggerates the size of the lobe below the i st notopod . 

 I find the lobe of the 3rd segment larger and more rounded than 

 he shows it, and that of the 4th segment or ist chaetiger only 

 very slightly developed. I give a figure of the modified hooks 

 (Fig. 76) of the ist thoracic torus. I have nothing further to add 

 to the numerous accounts of this species and its tube. 



3mmT 



Pista corrientis, Mcintosh. 



Mcintosh, 1885, p. 457, pi. xlviii, fig. 11 ; pi. xxvii A, fig. 35. 

 Hessle, 1917, p. 158, pi. ii, figs. 2 and 3. 



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. 105-115 m. 

 Gear OTL. Bottom: fine sand. One specimen. 



St. 195. 30. iii. 27. Admiralty Bay, King 

 George Island, South Shetlands. 62° 07' 00" S, 

 58° 28' 30" W. 391m. Gear OTM. Bottom: 

 mud and stones. ? Two specimens. 



Remarks. Of these specimens only that 

 from St. 51 is suitable for detailed exami- 

 nation. It measures 20 mm. by 2 mm. 

 The cephalic lobe is completely concealed 

 at the sides by the greatly developed 

 lateral flaps of the buccal segment. The 

 3rd segment has also well-developed 

 lateral processes. The ist pair of gills 

 (Fig. 77, a) has a long stalk and is richly 

 branched at the apex. The 2nd pair is 

 about two-thirds the size of the first. 

 Small nephridial papillae are visible at 

 the sides of the 3rd and 4th notopods 

 (6th and 7th segments). The dorsal bristles 

 have wide wings (Fig. 77, b) and the an- 

 terior hooks are well figured by Mcintosh. 

 I give a figure of a hook (Fig. 77, c) from 

 a biserial thoracic torus, in which the 

 posterior prolongation is absent. I find 

 this species difficult to separate from 

 Pis fa symbranchiota (Ehlers). 



-LO 



Fig. 76. Pista mirabilis. 

 Hook of ist thoracic 

 torus. 



O-L 



a 



T-08min 











b 



Gill. 



Fig. 77. Pista corrientis. 



b. Dorsal bristle, c. Hook from 

 biserial thoracic torus. 



24-J 



