36 



Remarks. In the notes on Copepoda left by Boeck this form is named 

 as above. No description however, has, been published, and the figures accom- 

 panying the notes are, as far as this form is concerned, copies from some drawings 

 long ago executed by the present author. It would seem therefore, that Boeck 

 himself had not observed this Calanoid. The present form may be at once 

 distinguished from the others belonging to the family ^Etideidce, by its unusually 

 short and robust body and the comparatively short and densely setiferous anterior 

 antennae. Moreover, the upturned acute lateral lappets of the last segment of the 

 metasome distinguish it very conspicuously. 



Occurrence. I have met with this peculiar Calanoid in several places 

 off the Norwegian coast, from the Stavanger Fjord to Apelvser (Namdal), but 

 only in greater depths ranging from 50 to 150 fathoms. Like the species of 

 the genus Undinopsis, it is a true bottom-form, always keeping close to the 

 ground, and accordingly only to be obtained by the aid of the dredge. I have 

 several times had an opportunity of observing this form in the living state. It 

 moves in a peculiar revolving manner, chiefly by the aid of the posterior antennae 

 and the powerfully developed mandibular palps, only now and then making an 

 abrupt bound by the action of the natatory legs. All the specimens which I have 

 seen, are of the female sex. The male, when once detected, wille undoubtedly 

 exhibit some additional distinguishing character of the present genus. Out of 

 Norway this form has not yet been observed. 



Fam. 6. Euchaetidae. 



Characters. Cephalosome coalesced with the 1st pedigerous segment, or 

 at any rate imperfectly defined from it. front projecting in an acute, undivided 

 rostrum. The last 2 segments of metasome united. Urosome consisting in female 

 of 4 segments, the last of which, however, is very small, genital segment more 

 or less protuberant below. Caudal rami short, with the outermost marginal 

 seta rudimentary, appendicular bristle issuing from the inner corner of the rami, 

 and generally much elongated. Anterior antennae slender, with some of the bristles 

 of the anterior edge very long and extending in different directions; those of 

 male provided at the base with strongly developed sensory appendages. Posterior 

 antennae and mandibles normal. Maxilla with the palp incurved in an unusual 

 manner. Both pairs of maxillipeds very powerfully developed; the posterior ones 



