S62 



MRS. E. W. SEXTON ON THE 



knowledge of the bathymetrical limits of any species is far too 

 inMequate to base any conclusions vipon. Grube's hirsutimana 

 from the Adriatic is the same species. 



L. ti'ici'istatus Chevreux becomes a synonym of gvMatus Grube. 

 An interesting point in this species is the varying development of 

 different chaiucters, notably the antennte, the last pei-seopod, and 

 the last uropods. 



L. hisjnnosios Noi-man I considei- identical with the species 

 described and figured by Delia Valle as L. yutiatus. Heller's 

 P. hirsutimana is to be referred to this species (see p. 585). 



I have been unable to trace the type specimens of two species, 

 L. aberrans Ohlin, and Protomedeia hirsutimana var. massilie.vsis 

 Catta. The only specimen of aherrans, dissected by Dr. Ohlin for 

 the purpose of description, appears unfortunately to have been 

 lost. 



There is nothing to add to Mr. Stebbing's definition of the genus, 

 * Das Tierreich,' p. 625, except that the outer ramus of uropod 3 in 

 all the species is 2-jointed, the terminal joint rudimentary. 



The development of the secondary sexual chai-acters in the male 

 can only be definitely stated in two species, L.pilosus and pinguis ; 

 a great deal more material must be examined before it can be 

 decided whether the rule which applies to these species holds good 

 for the whole genus or not. In pilosus and phiguis the first gna- 

 thopod in the male is longer than the second, the hand is greatly 

 developed, the palmar margin concave ; while in the female, on the 

 contrary, the first gnathopod is shorter than the second, and the 

 palmar margin is convex. The full-grown female, in all the other 

 species, agrees with this description. I find another distinction 

 between the sexes in the type species {L. pilosus), in the shape 

 of the basal joint of the 5th perseopod (see PI. XVII. figs. 22 

 & 23) ; but as this is the only species in which I have had the 

 5th perseopods of both sexes, I cannot say if this distinction is 

 generic or only specific. 



The species now included in the genus are as follows, arranged 

 in chronological order, with their principal distinguishing cha- 

 acters : — 



1. L.pilosics Zaddach 1844, =Z. cornuaurei iSowinski, 1898, the S , 



and L. suhsalsus Norman, 1908, the $ . Pleon-segments not 

 dentate: accessory flagellum 1 -jointed : gnathopod 1 greatly 

 developed in S , longer than gnath. 2 ; shorter than gnath. 2 

 in $ ; 5th joint in c5" powerful and curved, 6th bent inwards 

 at right angles to the 5th, palmar mai'gin concave ; palmar 

 margin convex in 5 : finger of gnath. 2 almost straight, apex 

 acute. 



2. Z. ^mgriws Stimpson 1853. Pleon-segments 4, 5, & 6 each with 



2 dorso-lateral angles : accessory flagellum long, 6-8- jointed : 

 hind margins of sideplates 1-4 serrate, spiniferous : hand of 

 gnathopod 1 greatly developed in S , and much longer 

 than gnath. 2 ; much shorter than gnath. 2 in $ ; palmar 

 margin concave in S , convex in $ : finger of gnath. 2 as in 

 pilosus. 



