66 University of California Publications. [Zoology 



equal in length; second basal of maxilla with five bristles, inner 

 ramus with eight, outer wdth nine. Anterior maxillipecl with 

 pencillate appendages. First joint of outer ramus of first foot 

 without marginal spine. Fifth foot 3-jointed, terminal joint not 

 much longer than the others, with three heavy bristles (PL 13, 

 fig. 70). 



Length: Female, 6 mm. 



Coloration : Rather opacjue and without pigment. 



Occurrence : Common through summer of 1905 in deeper 

 hauls. 



Scolecithrix magna (Scott). 



PL 9, fig. 13; pi. 11, fig. 3S; pi. I'l, figs. 52, 64; pi. 13, fig. 72. 



Scolecithrix cristata, Giesbrecht ('95), p. 252, pi. 2, figs. G-S; pL 



3, figs. 1-5; ('98), p. 48, fig. 8. 

 Amallophora magna, Scott ('93), p. 55, pi. 4, figs. 5-9. 

 Amallophora magna, Sars (:02b), p. 55, pis. 34-35. 

 Scaphocalanus acrocephalus, Sars ( :00), p. 36, pis. 7, 8, 9; (:02b), 



p. 51. 



Female : Forehead (PI. 9, fig. 13) with a low and rather long 

 crest; last two thoracic segments fused; rostral filaments long 

 and slender. The last thoracic segment ends laterally in a small 

 rounded projection (PI. 11, fig. 38). The two middle segments 

 of the abdomen are about equal in length, shorter than the gen- 

 ital segment, and about twice as long as the anal segment. xVnte- 

 rior antennae 22-jointed, reaching a little beyond the cephalo- 

 thorax. Second basal of maxilla with four bristles, inner ramus, 

 with seven. Sensory appendages of anterior maxilliped pencil- 

 late and vermiform. First basal of fourth foot with plumose 

 inner marginal; first joint of outer ramus of first foot (PI. 12, 

 fig. 52) without marginal bristle, second joint with a very small 

 one and third joint with a large one. IMarginal spine of second 

 joint of outer ramus of second foot longer than the curved mar- 

 ginal of the first joint or than those of the third (PI. 12, fig. 64). 

 Third foot, and especially the fourth, with shorter spines. Fifth 

 foot (PI. 13, fig. 72) 2-jointed, with three bristles at the end, the 

 one on the inner margin being the longer; the outer marginal is 

 small. 



