COPEPODS OF THE WOODS HOLE REGION 



79 



Seo"nient figure 53.— Scaplwoalanus validua: 

 Male, fifth legs ; b, female, fifth legs 



Female. — Head without a frontal crest; posterior corners of fifth 

 segment rounded; rostrum with long undivided filaments; caudal 

 rami one-half longer than wide; 

 fifth legs apparently 2-segmented, 

 the second and end segments fused, 

 the spine on the inner margin as 

 long as the fused segment and 

 setose, the terminal spine one-third 

 as long and setose, the outer spine 

 smooth, minute^ and in the female 

 close to the base of the terminal 

 spine. Total length, 3.2-3.75 mm. 

 Male. — Body smaller than that 

 of the female, without a crest; pos- 

 terior corners of fifth 

 smoothly rounded; basipods of left 

 fifth leg elongate and cylindrical, the rami 3-segraented, the 

 exopod longer than the endopod; second basipod of right fifth leg 

 spherically swollen proximally, strongly narrowed distally ; endopod 

 1-segmented, less than one-third the length of the narrowed part of the 



second basipod; exopod 2-segmented, 

 the end segment slenderandcurvedinto 

 a hook at the tip without articulation. 

 Remarks. — These specimens were 

 mixed with those of another genus 

 from the same station and thus es- 

 caped Eathbun's attention, so that he 

 made no notes on their color. They 

 have never before been reported from 

 the American side of the Atlantic. 



SCAPHOCALANUS OBTUSIFRONS (G. O. Sars) 



Figure 54 

 Amallophora odtusifrons Sars, Bull. Mus. 



Oc^anogr. Monaco, no. 26, p, 22, 1905. 

 Scaphocalanns oMusifrons With, Danish 



/nf/o?/-Expedition, vol. 3, pt. 4, Copepoda 



1. p. 194, figs. 60, 61, pi. 7, fig. 9, a-d, pi. S, 



fig. 8, a^e, 1915. 



Occurrence. — A single female from 

 the trawl wings, Station 2230, Alba- 

 tross., south of Long Island. 



Distribution. — North Atlantic (Sars, 

 Farran) ; South Atlantic (Wolfen- 

 den) ; Denmark Strait, Iceland, Faroe Channel (With) ; Malay Arch- 

 ipelago (A. Scott) ; Gulf of Maine (Bigelow). 



Figure 54. — Scaphocalanns 

 frons: a. Female, fifth legs 



oMusi- 



b, male. 



fifth legs (after With) 

 dorsal 



c, female, 



