540 Mr. L. A. Borradaile on the 
of the carapace, but marked off by a ridge on each side, bears 
a third ridge in the middle, each of the ridges ending short 
of the fore edge of the carapace in a strong tooth, and falls 
steeply to the rostrum; with pigmented eyes, without any 
vestige of scale or fixed thorn on the antenna (?), and with 
no suture on the exopodite of the last limb.” The gills are 
not known. 
Species : 
Type. S. serripes, Gerst., 1850. Arch. Naturges. xxii. I. 
S. tricarinatus (Kingsley), 1882. Bull. Essex Inst. xiv. I. 
Family Laomediide, n. 
Definition: “Thalassinidea with the rostrum of a good 
size; linea thalassinica present; antennular flagella rather 
short, no vestige of antennal scale (?) or fixed thorn ; the first 
pair of legs large, chelate, equal, the second pair simple or 
subchelate, the third and fourth simple, the fifth subchelate ; 
mastigobranchs on all the thoracic limbs except the last, 
podobranchs at least on the third to sixth, arthrobranchs on 
the second to seventh; the gills trichobranch, with somewhat 
broadened filaments; the pleura of the abdominal segments 
fairly well developed; the abdominal limbs without appendix 
interna, and the last pair of limbs with a suture ou both 
exopodite and endopodite.” 
Many points with regard to the two genera of this family 
are still unsettled. The gill-formula of Laomedia is as yet 
uncertain as regards the maxillipeds. The lack of an ap- 
pendia interna on the abdominal limbs of Jawea is only to be 
inferred indirectly from the fact that Heller does not mention 
it in his careful description, and from its absence in the 
allied Laomedia. Heller does not say that the endopodite of 
the last limb in Jawea (his Calliaxis) has a suture, but he 
figures one clearly. Lastly, it may well be that here (and in 
Scytoleptus also) careful search would show that a trace of 
the antennal scale remains. 
Genera: Laomedia, Jaxea. 
Genus Laomenta, de Haan, 1849. 
Definition: ‘ Laomediidz which have on the maxillipeds 
of the first pair no lash to the exopodite nor podobranch, the 
chelz in the legs of the first pair stout, and those of the 
second pair simple.” 
Species : 
Tere ee: eee, de Haan, 1849. Von Siebold’s ‘Fauna Japonica,’ 
/YUSU. 
