23 



.85 mm. 



Nov. 10th, 1896. Puddefjord. 

 08 m. 



cT Front body 0.60 mm. 1 

 Hind 1.25 } 

 M. hibernica is easily distinguished from the longa by the 

 pointed corners at the last body-segment (fig. 26), and by its com- 

 paratively shorter furca, the breadth of the branches being about 

 half the length (fig. 25). 



Metridia longa, Lubbock. 



The largest specimens of this species I took in the Ofoten- 

 fjord. The largest female measured 4.29 mm. The males had a 

 length of about 3.5 mm. M. longa occurs at greater depths in the 

 fjords near Bergen, but the females here have scarcely exceeded 

 4 mm. The largest one I have till now measured was 3.9 mm. 



I 



Heterochceta norvegica, Boeck. 



In Kristiania Videnskabsselskabs Forhandlinger for 1872, AXEL 

 BOECK has given a short diagnosis of a copepod that he had 

 taken at a rather great depth off the Norwegian coast, and 

 which on examination was found to be of a species differing 

 from the forms described by GLAUS (spinifrons, papilligera). The 

 said new species received the name of heterocJueta norvegica. GIES- 

 BEECHT, in his well-known "Monographic", has noted this as "Un- 

 bestimmbare Species", at the same time stating that some of the 

 characteristics given suggest some known species. BOECK'S descrip- 

 tion of 5th left foot of cf does not however agree with any of the 

 species previously described. The original description of h. nor- 

 vegica is as follows: 



"The upper feelers are not as long as the body. The basal 

 joint of the outer jaw-foot is armed with a strong thorn. The 

 final part is distinctly separated. The first joint of the upper 

 feelers is longer than the four others together. The outer branch 

 of the second to fourth pair of feet is about three times as long 

 as the inner branch. The final joint is very large, oval, supplied 

 with three teeth in notches on the outer edge and at the point, 

 as well as near the latter with three rough saw-teeth. In the 

 males the basal joint of the right fifth pair of feet is drawn out 

 into a very large curbed hook. The second joint of the outer 

 branch has on the inner edge a knot. The third joint is drawn 

 out into a strong point. In the left fifth pair of feet the third 

 joint of the outer branch is shorter than the second, and inwardly 

 drawn out into a strong point, against which a curbed claw from 

 the point of the joint can strike". This short description, which 

 is not accompanied by drawings, is certainly meant by the author 

 to be only a preliminary one. It is seen from BOECK'S work 

 ("Nye Slegter og Arter af Saltvands Copepoder") that it was his 

 intention to deliver an extensive work on the copepods. Death 

 however abruptly put a stop to the realization of this plan. 



By examing a sample from the Ofoten-fjord, taken Feb. 25th, 

 1897, depth 250 m., I discovered two specimens (9, cT) of 



f 



nm. ) 



3. 



" ) 



78 mm. 



heterochceta which showed a rather great likeness to h. papilligera. 

 A closer inspection has proved that the specimens from the Ofoten- 

 fjord differ, especially in the structure of fifth pair of feet, from 

 papilligera, while in all essentials they correspond with the descrip- 

 tion of h. norvegica. The latter will therefore, in my opinion, 

 have to be maintained as a seperate species. 



Description of $. 

 Length. Front body 2.70 mm. 

 Hind 1.08 

 Greatest breadth 1 mm. 



The front body consists of 5 segments, the two hinder ones 

 being joined into one. Of these thl and th4 5 are about 

 equally broad, likewise th2 and th.3, which however both are 

 narrower than the two former ones. (The terms of GIESBRECHT'S 

 denotation are here adopted). The head segment carries two 

 extremely small hairs, pointed forwards, and the two rostral 

 threads. The brow papilla is not pointed as in h. spinifrons, but 

 bears an obvious likeness to the corresponding one in h. papilligera. 



The hind body (fig. 11) consists of four segments, diminishing 

 in length downwards; the genital segment is a little longer than 

 the three following taken together. The joint connection between 

 ab5 and furca is rather indistinct. The length of the furcal 

 branches is not quite three times as great as the breadth, the 

 left branch being a little longer than the right one. Each furcal 

 branch carries 5 large brushes and, besides, an extremely small 

 one on the inner side. One of the brushes on the left branch is 

 much longer than the others. It was torn off both in the male 

 and the female, but it is likely to be longer than the body in 

 both of them. The piece that was left measured a little over 2 

 mm., and at the fracture the thickness had not perceivably de- 

 creased. The genital segment is on the ventral side very much 

 swollen, dorsally it has a peculiar inward curbing. Besides, the 

 genital segment and the two following ones carry on the dorsal side 

 a series of thorns (fig. 11). In the former this thorny row 

 sits a little above the lower edge, in the two others in the edge 

 itself. The first pair af antennae consist of 25 different pieces, of 

 which the foremost one, which is pointed forward, is longer than 

 the four following ones taken together. The length of the antennae 

 is 4.2 mm., they are consequently longer than the body, but as 

 the proximal part is stiffly projecting, the antennae when folded 

 along the body will scarcely reach the end of the furca. 



The posterior antenna? which are fixed to a comparatively long 

 handle, have two branches, of which the inner branch is somewhat 

 longer than the outer branch. The inner branch is made up of 

 two joints of which il is about three times as long as i2 (fig. 10). 

 The inner branch is made up of 8 joints, the outermost of which 

 is longer than the 4 following taken together (fig. 24). The ma- 

 sticatory edge (fig. 21, 23), of the mandible has a characteristic 

 armament, there being at one corner a curved tooth, at the other 

 corner three teeth, with one, three, and two points respectively; 

 at the base of the last-mentioned point also sits a little brush. 

 The palp of the mandible consists of a short basal joint and a 

 long one, to which are joined two branches, the outer branch being 

 broader than the inner one (fig. 21). Both have feathery brushes 

 at the top, besides a little feathery brush sitting at the second 



