AET. 18 SYNOPSIS OF CALANOm CRUSTACEA — MAESH 37 



mose spine at the inner distal angle ; the terminal spine is elongate, 

 apparently with a hyaline lamella and has a rather long slender 

 spine at its base. 



Length, 1.2 mm. 



Male. — The right fifth foot (pi. 19, fig. 2) has what may be a rudi- 

 mentary endopod about midwa}'^ of the inner border of the second 

 segment of the basipod. The first segment of the exopod is extended 

 at its outer distal angle into a hooklike projection which is about 

 four-fifths as long as the second segment. The second segment of 

 the exopod has a straight, slender, lateral spine near the distal end. 

 The terminal hook is symmetrically curved and is about as long as 

 the two segments of the exopod. The left foot has an irregularly 

 shaped endopod, which reaches nearly to the middle of the second 

 segment of the exopod. The second segment of the exopod is rather 

 broadly expanded, has a spine about midway of the external margin, 

 and has some surface hairs. The left foot reaches the base of the 

 hook of the right foot. 



Occurrence. — Found in Banana Creek at the mouth of the Congo. 



PSEUDODIAPTOMUS HICKMANI Sewell 



Plate 19, Figures 3, 4 

 Pseudodiaptomus hickmani Sewell, 1912, p. 364, pi. 22, figs. 1-7. 



Female. — The head is separated from the thorax and is somewhat 

 pointed in outline ; it has a bifid rostrum. The sides of the last thor- 

 acic segment are pointed. The first three abdominal segments have 

 spines on their distal borders. The furcal rami are short, about twice 

 as long as broad, and ciliate on the inner margins. The antennae 

 have 22 segments and nearly reach the second abdominal segment. 

 The second segment of the exopod of the fifth foot (pi. 19, fig. 3) has 

 a very small spine at the outer distal angle ; it terminates in two stout 

 spines of nearly equal length, the inner one bearing a dentate lamella. 

 The spine representing the hook has a small blunt spine on its base. 



Length, 1.37 mm. 



Male. — The terminal portion of the right antenna has three seg- 

 ments. In the right fifth foot (pi. 19, fig. 4) the second segment of 

 the basipod has a Y-shaped endopod, the two branches having bifid 

 tips. The exopod has three segments. From the base of the first 

 segment of the exopod springs a Y-shaped process. The second seg- 

 ment of the exopod has a row of small spines at its outer distal angle, 

 and at the inner distal angle a stout serrate spine. The terminal 

 hook is stout and denticulate. An endopod on the left foot reaches 

 to more than half the length of the second segment of the exopod. 



