114 



the length of the anterior division and narrow cylindrical in form; genital segment 

 of moderate size, with the anterior part slightly dilated, forming on each side a 

 rounded prominence. Caudal rami slightly exceeding in length the anal segment 

 and suhlinear in form, being scarcely at all divergent; outermost seta, together 

 with the dorsal bristle, slightly remote from the apex; middle apical seta of 

 moderate length. Anterior antennae slender, though scarcely exceeding half the 

 length of the cephalic segment, and composed of 12 joints, the last one much 

 the longest. Posterior antennae rather narrow, with the terminal joint consider- 

 ably produced, being almost as long as the 2nd (basal) joint, and carrying 

 3 apical and one lateral seta, middle apical seta much longer than the other 2, 

 lateral seta attached near the base. Siphon extending about to the end of the 

 cephalic segment. Maxilla) with the outer lobe rather narrow, sublinear in form, 

 and carrying on the tip 2 moderately long setae; inner lobe conical in form with 

 the apical seta very slender. Anterior maxillipeds with the dactylus exceedingly 

 narrow and elongated, distal part evenly curved and clothed inside with minute 

 spinules. Posterior maxillipeds with the hand unusually narrow, dactylus normal. 

 Natatory legs moderately strong, with the spines of the outer ramus finely 

 denticulate; 1st joint of inner ramus in 1st pair unusually broad and, like the 

 2nd basal joint, provided on the lower face with a rounded, boss-like prominence. 

 Last pair of legs extremely minute ; distal joint provided with 3 small bristles, 

 one apical and 2 lateral. 



Body, according to Giesbrecht, nearly colourless, with reddish orange 

 translucent intestine and lateral coeca; eye very large and bright red. 



Length of adult female about 1 mm. 



Remarks. This Copepod resembles in its outward appearance certain 

 forms of the Ascomyzontidos, but is easily distinguishable by the rather different 

 structure of the anterior antenna?. The specific name proposed by Giesbrecht 

 alludes to the narrowly-produced siphon, which in some cases is seen projecting 

 from the body at nearly a right angle, as indicated in the side-view figure 

 given by Giesbrecht. 



Occurrence. A solitary, but well preserved female specimen of this form 

 was found in a sample taken at Korshavn, south coast of Norway, from a depth 

 of about 40 fathoms, muddy sand. 



Distribution. Bay of Naples (Giesbrecht), Franz Joseph Land (Scott). 



