io3 



exopodite is composed of two joints. The first joint is elongate and narrow. The second joint 

 is short and dilated. The apex of the joint is furnished with a pad of hairs and a spine. The 

 endopodite is one-jointed, and is in the form of a sickle-shaped spine, which extends to the 

 end of the exopodite. The distal half of the inner margin of the endopodite is finely serrate 

 (Plate XXIII, fig. 14). 



O ecu rr ene e. Four females and one male were found in the plankton collected 



with the Hensen vertical net at Station 14S, 1000 metres to the surface. 



The fifth pair of the male of Giesbrecht's species is not unlike the figure given in this 

 report, but when a comparison is made, it is seen to be distinct. The base of the exopodite 

 of the right foot is only slightly produced internally, and the endopodite of the left foot is 

 very broad and strong. It is not sickle-shaped as in Mücandrewella joanae. 



This genus and species is dedicated to the memory of my mother, whose encouragement 

 did much to help me over many difficulties encountered in the study of the Copepoda. 



Genus Scottocalanus G. O. Sars, 1905(3). 



This genus was established by Sars in 1 905 for a Sco/ecif/irix-\ike form with a peculiar 

 median crest and a very strong bifurcate rostrum. The structure of the fifth feet of the two 

 sexes was also made a character of the genus. 



The typical species of the genus was first obtained by my father in the plankton col- 

 lected in the Gulf of Guinea. It was described in the report 'On Entomostraca from the Gulf of 

 Guinea' as Scolecithrix securifrons. Both male and female were described, but is has since been 

 shewn by Canu and Farran, that the form regarded as the male really belongs to another 

 species. Giesbrecht in 1895 described a closely allied species as Scolecithrix per secans. A good 

 deal of confusion appears to have arisen in the identification of the two forms during the past 

 few years, and an attempt is made to put these species on their true basis in the present report. 



Female. The head is completely fused with the first thoracic segment, and possesses a 

 well defined chitinised crest on the forehead. The fourth and fifth thoracic segments are com- 

 pletely fused. The rostrum is bifurcate and highly chitinised. Each ramus bears an apical spine 

 and there is a distinct articulation between the spine and the basal portion. The abdomen is 

 composed of four segments. The antennules are twenty-four-jointed. The antennae, mandibles, 

 maxillae and maxillipedes are somewhat similar to those of Scolecithricclla, except that the 

 apical lobe of the first maxilliped is furnished with a moderately stout and slightly curved 

 claw. There are two types of sensory organs. Some are long and rounded at the apex. Others 

 are shorter with distinctly swollen heads. The four pairs of swimming feet are similar to those 

 of Scolecithricclla^ but the surface of the joints is only sparsely furnished with spines. The fifth 

 pair is composed of one free joint attached to a basal part. The apex of the free joint bears 

 one long curved spine, and one very short spine. The small spine is situated on the apex of 

 the joint. The long spine is outside the small one and its position is usually subapical. 



Male. In general appearance it resembles the female. The abdomen is composed of five 

 joints, and the genital segment is asymmetrical. The antennules are composed of nineteen to 

 twenty joints. The antennae, mandibles, maxillae and maxillipedes are similar to those of the 



