15 



name proposed by Dana. From the type genus, Eucalanus Dana, it is moreover 

 clearly distinguished by the presence of a 5th pair of legs, which in the 

 female of Eucalanus are wholly absent. Three species of this genus are as yet 

 known, one of them being now for the first time stated to occur also in the 

 northern oceans. 



4. Rhinealanus nasutus, Giesbrecht. 



(PI. VI & VII). 



Eldncalanus nasutus, Giesbrecht, Pelagisclie Copepoden (Fauna und Flora des Golfes von Neapel 

 XIX), p. 154, PI. 3, fig. 6; PI. 9, figs. 6, 14; PI. 12, figs. 9 12 ; 14, 16, 17; PI. 35, figs. 46, 47, 49. 



Specific Characters. Female. Body exceedingly slender and elongated, 

 with the anterior division, seen dorsally, narrow oblong in form, greatest width 

 not even attaining ] /4 of the length, and occurring behind the middle, cephalic 

 part gradually attenuated, though slightly widening at the insertions of the anterior 

 antennre, and produced beyond the latter to a conical anteriorly-pointing projec- 

 tion; rostral filaments not visible in the dorsal view of the animal. Anterior 

 body-segment (the combined cephalosome and 1st pedigerous segment) nearly 

 twice as long as the remaining part of metasome. 2nd, 3rd and 4th pedigerous 

 segments each with 2 small subdorsal, and 2 lateral denticles on the hind edge. 

 Urosome about equalling in length Vo of the anterior division, genital segment 

 with 2 small dorsal denticles in the middle. Caudal rami somewhat instricted 

 in their outer part, left ramus a little longer than right, innermost seta of both 

 rami much shorter than the others. Anterior antennae exceedingly elongated, 

 when reflexed, reaching beyond the caudal rami by about 1 /-> of their length, and 

 inserted at rather a long distance from the posterior antennae and the oral parts, 

 which are closely crowded together. Last pair of legs very small, each of the 

 2 outer joints with a ciliated seta inside, terminal joint moreover carrying at the 

 tip a similar seta and, outside it, a slender unciliated spine. Body highly pel- 

 lucid, and almost without any pigment. Length of adult female 5.40 mm. 



Remarks. This species was first described by Dr. Giesbrecht from the 

 western part of the Mediterranean. It is easily recognized by the shape of the 

 frontal projection, and the exceedingly long and slender anterior antennae. It is 

 moreover distinguished from the type species, E. cornutus Dana, by a somewhat 

 different structure of the last pair of legs. 



Occurrence. Two well-preserved female specimens of this peculiar Cala- 

 noid were found in a sample of plankton taken during the cruise of the "Michael 

 Sars" at Stat. 10, located at some distance east of Iceland, the depth being stated 

 to be between 250 and 400 meters. Another female specimen was found at an 



