212 e. w. sexton. 



Fam. PHOTIDAE. 



Gen. Leptocheirus, Zaddach. 



Leptocheirus pectinatus, Norman. 



= Leptocheirus dellavallei, StebLing. 



(Sexton (36), pp. 576-585, PI. XIX.) 



Station II. One .specimen, an ovigerous female, measuring 4 'S mm. 



For the discussion of this species and proofs of the identity of the 

 two iorms pectinatus and dellavallei, see the paper referred to above. 



Fam. JASSIDAE. 



Gen. Jassa, Leach. 



[Jassa falcata (Montagu). 



No specimens of this species were taken during the cruise, but it is 

 necessary to include a note relating to it in order to explain my 

 reasons for using the specific name falcata, in the discussion of 

 J. imsilla, instead of 'pulchella as established by Stebbing (41), p. 654. 

 The species is a difficult one owing to the diflerent forms assumed by 

 ,the male during development, this causing great confusion not only in 

 the species itself, many of the stages having been described as distinct 

 species, but also leading to further confusion with other species, 2'>usilla 

 in particular. 



There would seem to be at least two well-marked forms of falcata. 

 During immaturity it is absolutely impossible to distinguish between 

 them, but as they grow they differentiate into either — a form with the 

 Hagella of the antennae swollen, some of the joints coalesced, the 

 hand also swollen, and thumb broad ; or a form with the antennae 

 slender, joints distinct, hand and thumb slender. In both forms there 

 appear to be two distinct kinds of adult males, besides the several 

 markedly different stages during growth. The females are exactly 

 alike, except that some have antennae like the first form, and others 

 like the second. Whether these will prove to be seasonal variations, 

 or whether they are really two distinct species, I have not as yet 

 sufficient evidence to speak with certainty. Experiments in rearing 

 them, connuenced in 1909 in the Laboratory here, have only been 

 successful to a certain point ; some of the stages have moulted but the 

 series is still far from complete. 



