830 Mil. 11. G. JACKSON ON THE 



sinuate; median V very obtuse and almost linear, not produced. 

 Transverse groove deep and passing behind eyes. Frontal 

 grooves Avell marked, joining transverse groove at obtuse angle 

 behind eyes. Eyes large and pear-shaped. Thorax. 1st somite 

 with deep lateral depression on each side, extending to hind 

 border. On hind border of depression a dense bristle group. 

 Coxal plates: sutures well marked on last four somites in both 

 sexes ; moderately diawn backwards on last three somites. 

 Antennal flagellum reaching back as far as hind margin of 2nd 

 thoracic somite ; with 11 segments. Uro2)ods. Inner process of 

 base long, curved, and nearly as long as base. Endopod by itself 

 not more than half exopod ; combined with inner process reaching 

 nearly as far, or as far as, but not beyond, tip of exopod. 

 Ex:opod about three times as long as inner process, Telsou 

 arcuate ; not notched or only faintly notched over uropods. 



Pleopods of 6 . 1st exopod with 2 or 3 large setai ; 1st endopod 

 di'awn out internally into long narrow process with 3 large 



Text-figure 4. 



liigidium Iii/2)vorum. a, 2iid pleopoil, <? ; h, endopod of samu from luiotlior 

 siJL'ciiiieii ; o, lu'opod troni above, 



bi-istles; terminal segment of 2nd endopod with rounded or 

 almost triangular lappet. 



Colour. Brown and yellow mottled. Dark moie or less con- 

 tinuous band over junction of coxal plates and tergites. 



Distrihttiion. Europe ; California ; Niagara (Canada). This 

 species has not been recorded from N. America since Stuxberg 

 (1875), on which Budde-Lund (1885) comments, "quid mihi 

 minus verisimile videtur." 



Figured in full by Sars (1899). 



I have included L. cursormm Budde-Land and L. melano- 

 cephala Koch as synonyms of this species after a minute exami- 

 nation of the original specimens. Verhoefi' rightly conjectures 

 that L. cursorkim is a large variety of Z. hypnorura, and as such 

 I have distinguished it. L. melanoce2)hala is a coloui- variety, 

 with slight structural features to separate it from L. hj/pnoruin. 

 I agree with Vei'hoeff that L. amethystmm is almost certainly a . 

 synonym. 



