FEOM THE GULF OF GUINEA. 53 



rostrum ; jiostero-lateral angles of last thoracic segment rounded. Anterior antennre 

 long, reaching to near the extremity of the abdomen, 21 -jointed and sparingly setiferous. 

 The annexed formula shows the proportional lengths of the joints : — 



12 . 3 ■ 3 . 3 . ;i ■ 3 . 8 . 3 ■ 3 ■ 4 . 6 ■ ■ 7 ■ 7.8.7.7.7.6.8.11 

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1(5 17^18~i9~2(rTl' 



Anterior foot-jaws stout ; four of the marginal lobes are each armed with a long 

 setiferous spine and two sctce ; a number of slender sensory filaments spring from the end 

 of the anterior foot-jaws as in other species of Scolccithrix. The terminal spines of the 

 swimming-feet are finely toothed on the outer margin ; the arrangement of the marginal 

 teeth of the terminal spines of the third and fourth j)airs differs from those of the second, 

 as shown in figure 36. The fifth pair are small, somewhat dilated, and 1-jointed, armed 

 with one terminal spine, a stout and prominent spine on the inner margin, and a small 

 tooth on the outer margin (fig. 37). Abdomen short, stout, the last segment small. Caudal 

 stylets short, the breadth about equal to the length, and furnished with one subterminal 

 and three apical sette. 



Eabitat. Lat. 1° 55' 5" N., long. 5° 55' 5" E., 460 fathoms (January 22nd, day collection). 

 Station 23, 85, and 235 fathoms (February 5th, day collection). 



Scolecithrix tumida is a rare species in the ' Buccaneer ' collections ; its robust form, 

 the spinous armature of the anterior foot-jaws, and the dilated fifth pair of feet are 

 characters that readily distinguish it from other species of Scolecithrix. 



Scolecithrix dubia, Giesbrecht. (PI. III. figs. 27-32 ) 



1892. Scolecithrix dubia, Giesbrecht, oj). cit. p. 281, pi. 13. fig. 29 a. 

 1892. Scolecithrix simulans, Scott (!MS. uame). 



? Male. Length 1-6 mm. Body robust; abdomen of moderate length, 3-jointed, the 



middle segment rather shorter than the first or last. Anterior antennae reaching to 



about the end of the second abdominal segment, sparingly setiferous, composed of twenty 



joints, the eighth equal to the entire length of the preceding four, the last two elongate, 



slender. The formula shows the proportional lengths of the diflerent joints : — 



5. 5. 3.3. 3.3. 3. 12. 3. 5. 6. 7.7. 7.7.5 .5.4.8.0 

 12 3 4 5 6 7 8 S) 10 11 12 13 14 15 10 17 18 19 20' 



The articulation between the sixteenth and seventeenth joints of the right antenna is 

 imperfect and somewhat indistinct. The posterior antennae, mouth-ap^jendages, and 

 first four pairs of swimming-feet nearly as in Scolecithrix Dcmce, except that the marginal 

 lobes, especially the one nearest the apex, of the anterior foot-jaws bear elongate curved 

 spines with ciliate inner margins ; the apex, as in Scolecithrix Dance, bears a number of 

 hair-like filaments (fig. 29). The terminal spines of the swimming-feet are finely serrate 

 on the outer and ciliate on the inner margins. The fifth pair are unequal; the (?) left 

 consists of three joints ; the basal part of the elongate middle joint is considerably swollen 

 and bears a (?) spiniform appendage on its inner aspect ; the inner angle at the distal end 



description and figures and the description and figures given in this Eeport, I leave the ' Buccaneer ' species as 

 originally described. 



