NO. 6.] ACCOUNT OF THE SPECIES. 1 13 



25. Onccea com/era, Giesbrecht. 

 (PI. XXXII, figs. 15, 16). 



Onccea conifera, Giesbrecht, 1. c. p. 600. etc., PI. 2, fig. 10 ; PI. 47, figs. 4, 16, 

 21, 28, 34-38, 42, 55. 



Specific Characters. Body comparatively more slender than in the 

 preceding species, greatest width of anterior division not nearly attaining half 

 the length. 1st pedigerous segment in female exhibiting dorsally a very con- 

 spicuous coniform gibbosity. Tail about half the length of the anterior divi- 

 sion, genital segment scarcely longer than the remaining part of the tail. 

 Caudal rami fully twice as long as they are broad, innermost apical seta 

 shorter than the outermost. Anterior antennae comparatively narrower than 

 in 0. notopus, 3rd joint longer than the 2 preceding ones combined, and 

 nearly twice the length of the terminal part. Posterior antennae with the last 

 joint almost as long as the 2nd, and having the 2 groups of anteriorly- 

 curving setae separated by a rather long interspace. Posterior maxillipeds 

 with the dactylus rather slender, and about the length of the palm, palmar 

 spines likewise slender. 2nd, 3rd and 4th pairs of legs with the inner ramus 

 produced at the tip, between the 2 apical spines, to a triangular projection. 

 Last pair of legs rather small, with the distal joint short, oval, not pro- 

 jecting dorsally, apical setae very unequal. Length of adult female 0'75 mm. 



Remarks. This form also, at least in the female sex, is distinguished 

 fairly well from the other species by an easily observable character, viz., 

 the peculiar dorsal gibbosity of the 1st pedigerous segment, this character, 

 indeed, having given rise to the specific name conifera, proposed by Dr. 

 Giesbrecht. It also differs from the preceding species in several other 

 points, mentioned in the above diagnosis. Any more detailed description of 

 it is not, I think, needed to show its identity with the form recorded by Dr. 

 Giesbrecht. 



Occurrence. This form was found rather plentifully in the same samples, 

 in which the preceding species occurred. 



Distribution. Coast of Norway, Mediterranean, Pacific Ocean, between 

 87 and 132 W., 13 N. and 3 S., down to 4000 metres (Giesbrecht). 



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