NO. 3573 COPEPODS — HUMES AND HO 13 



spine 25^1 long, with near its insertion an outer row of spinules and an 

 inner spiniform process with slightly bifvu-cated tip. In legs 2-4 this 

 margin more or less rounded and carrying only a row of haii'iike 

 setules. Terminal segment of endopod of leg 1 with 1 spine and 3 

 setae. Spinous processes at each side of insertion of spine either 

 entire or bifurcated at tip. Ornamentation of legs indicated in figures. 



Leg 5 (fig. 58) having an expanded free segment 83/x x 53ju in greatest 

 dimensions. Four elements borne on this segment consisting (from 

 dorsal to ventral) of a finely barbed spine 39/x long, a naked seta 66^ 

 long, a strong spinulose spine 44m long, and a short weakly barbed 

 spine 23iJL in length. Along dorsal edge of segment a row of spinules. 

 Seta borne on body dorsal to insertion of segment 40ju long and naked. 

 (In dorsal or ventral view of undissected animal, segment of leg 5 

 appearing much less expanded than actually.) 



Leg 6 probably represented by seta and spine near attachment of 

 each egg sac (see fig. 40). 



Color in life unknown. 



Male.- — -Unknown. 



Etymology. — The specific name latipes, from Latin, meaning 

 "ha\'ing broad feet," refers to the wide free segment of leg 5 in this 

 species. 



Comparison with related species. — Only a single species of the 

 genus Hippomolgus , H.Jurcvfer Sars (1917), has been known until now. 

 This species was described on the basis of 3 females found free in 60 

 fathoms, muddy bottom, on the coast of Norway. Males of Hip- 

 pomolgus are unknown, although Nicholls (1944, p. 46) has expressed 

 the view that the male of Hersiliodes dubia Thompson and A. Scott 

 (1903) is in reality a Hippomolgus. This opinion was followed by 

 Krishnaswamy (1953), who reported males of Hippomolgus dubia from 

 the plankton of Madras. It seems improbable to us, however, that 

 Hersiliodes dubia is a Hippomolgus. The mandible, described by 

 Thompson and Scott as having "2 horizontal plumose projections 

 and 2 plumose setae," is very different. Bocquet and Stock (1957) 

 think it probable that a new genus shoidd be created for Hersiliodes 

 dubia. 



Like Hippomolgus furcifer, H. latipes has a body form that is less 

 cyclopoid and more harpacticoid, has a relatively short 6-segmented 

 first antenna with a prominent aesthete on each of the last 3 segments, 

 lacks paragnaths, and has a generally similar structure of the second 

 antennae, mouthparts, and legs 1-5. 



There are, however, important differences between these 2 species 

 (based of necessity on the female only) . In H. latipes the first segment 

 of the first antenna does not bear a spine such as described in H. 

 furcifer. The mandible bears 3 terminal elements (2 spines and 



