Gen. 2. LOnglpedla, Glaus, 1863. 



Generic Characters. Body more or less slender, with the anterior divi- 

 sion conspicuously compressed. Cephalic segment comparatively large and confluent 

 with the 1st segment of metasome, its lateral parts very deep, forming broad 

 vertical lamellae, finely ciliated below, and wholly including between them the oral 

 parts; rostrum well developed, narrow linguiform. Epimeral plates of the 3 suc- 

 ceeding segments large, vertical, angularly produced behind, and including between 

 them the bases of the natatory legs. Last segment of metasome not much nar- 

 rower than the preceding one, "but without distinct epimeral plates. Urosome 

 gradually attenuated behind, genital segment in female with a very distinct trans- 

 versal suture in the middle dorsally, and exhibiting at the end of the suture, on 

 each side, a strong recurved dentiform projection; last 2 caudal segments com- 

 paratively short. Anal opercle produced at the tip to a spiniform process and 

 generally having a number of smaller denticles on each side. Caudal rami short, 

 with the apical setae more or less spreading. Anterior antennae rather robust and 

 much curved, consisting of 5 imperfectly-defined articulations thickly beset with 

 strong setae, some of which are plumose, others spiniform and strongly pectinate; 

 those in male terminating in a clawed hand. Posterior antennae with the outer 

 ramus fully as long as the inner and very flexible, 6-articulate. First pair 

 of natatory legs considerably smaller than the succeeding ones, with the spine 

 outside the 2nd joint of the outer ramus remarkably slender and upturned; 

 2nd pair with the inner ramus greatly elongated, baculiform, the last joint being 

 much produced and armed with 3 thick apical spines and 3 marginal ones. Last 

 pair of legs with the distal joint well developed, lamellar, proximal joint carrying 

 outside a long digitiform process, tipped by a delicate seta, its inner expansion 

 very narrow and terminating in a slender curved seta. A single ovisac present 

 in female. 



Remarks. This genus, established by Glaus, is easily distinguished from 

 any of the other Harpacticoida by the peculiar transformation of the inner, ramus 

 of the 2nd pair of legs to a kind of leaping-pole, a character, indeed, which has 

 given rise to the generic name proposed by Glaus. It moreover differs materi- 

 ally from the 2 other genera included in. the present family in the presence of 

 only a single ovisac. Oft the Norwegian coast occur 4 different, though very 

 nearly allied species, to be described below. 



2 Crustacea. 



