76 



ved Spidsen el Par meget lange og tvinle Horster. De 4 

 tm-vte Led forestiller Skaftet, de 2 sidste Svøben. 



Munddelene viser sig, naar Dyret sees nedenfra (se 

 Fig. 7 sammentrængte paa et forholdsvis lidet Rum og til 

 Siderne indesluttede af de paa Bagsiden ombøiede Sidedele 

 af Hovedskjoldet. Forti! mellem Roden af 2det Par Følere 

 bemærkes en liden afrundet firkantet, noget fremspringende 

 Plade, der forestiller Overlæben. Umiddelbart ban denne 

 og tildels dækket af samme sees de brunt farvede Tænder 

 paa Kindbakkernes indre Ender. Den øvrige Del af disse 

 < )rganer ligesom Underlæben og Kjæverne dækkes derimod 

 fordetmeste ganske af Kjævefødderne. Disse viser en lig- 

 nende Bygning som hos Sl. Sphyrapus. Den 4-leddede Palpe 

 er noget ndadrettet og langs den indre Kant tæt besat med 

 stærke indadkrummede Børster. 



Iste Fodpar (se Fig. 6 og 7) er som hos de øvrige 

 til denne Tribus horende Former udviklede til serdeles 

 kraftige Griberedskaber. De udspringer temmelig nær sam- 

 men med en bred Basis fra den bagerste Del af Hovedseg- 

 mentets Ventralside og retter sig med en stærk Sformig Boi- 

 ning fortil langs Siderne af Hovedskjoldet. Leddene er sær- 

 deles brede, noget sammentrykte fra Siderne og fyldte med 

 kraftige Muskler: de 2 sidste danner tilsammen en vel ud- 

 viklet Sax, der indtager omtrent l / 3 af Fodens Længde. 

 Fingrene, der neppe er kortere end Palmen, ender med en 

 skarp, stærkt krummet og hornfarvet Spids og viser langs 

 den indre Kant nogle uregelmæssige tandformige Fremspring, 

 der gribe ind mellem hverandre, naar Saxen er lukket (sml. 

 Fig. 14): i dette Tilfælde krydser Spidserne hinanden meget 

 sta'1'kt. 



De øvrige Fodpar (se Fig. 5 og 6) er alle omtrent 

 af ens Udseende og forestiller de egentlige Gangfødder. De 

 er af meget spinkel Form. med Basalleddet størst, men 

 neppe bredere end de øvrige Led. Endekloen er paa alle 

 ganske kort og simpel, ligesom de paa disse Fodpar fæstede 

 Borster er smaa og faa i Antal. 



Bagkroppens Buglemmer (se Fig. 8 og 9) er ganske 

 og aldeles rudimentære og saa smaa. at de meget let kan 

 forbisees. De er imidlertid tilstede i det sædvanlige Antal 

 og fæstede nær de afrundede Sidekanter af de 5 forreste 

 Segmenter (se Fig. 8). De bestaar som sædvanligt af en 

 Basaldel og 2 Endeplader; men disse sidste er særdeles 

 smaa og mangler ganske ethvert Spor af Børster, hvorfor 

 disse Lemmer heller ikke kan fungere som Svommeredskaber. 

 hvortil desuden deres ringe Størrelse vikle gjore dem ganske 

 u tjenlige. 



Halevedh.-engene (se Fig. 8 og 10) er forholdsvis meget 

 korte, paa langt nær ikke af sidste Segments Længd*. og 

 viser ialmindelighed en skråa Retning indad mod Midtlinien, 

 saa at, naar Dyret sees ovenfra, oftest kun de lange Ende- 

 børster rager frem fra Segmentets bagre Rand. De bestaar 



remarkably small, and not visible save wben highly magni- 

 fied; it bears at the point a couple of very long and slender 

 bristles. The 4 first joints represent the peduncle. the 2 

 last the fiagellum. 



The oral appendages - on viewing the animal from 

 below (seéfig. 7) — appeal' crowded over a -relatively small 

 space and enclosed at the sides by the lateral parts of 

 the cephalic shield. that bend over on the ventral surface. 

 Anteriorly, between the hases of the 2nd pair of antennæ, 

 is seen a small, rounded, quadxate, somewhat projecting plate, 

 representing the labrum. Immediately posterior to this 

 plate, and partially covered therehy. appear the brown- 

 coloured teeth, at the inner extreniities of the mandibles. 

 The remaining portion of tbese organs, as also the labium 

 and the maxillæ. are. on the other hand. as a rule. entirely 

 concealed by the maxillipeds. The latter exhibit a similar 

 structure to those in the genus Sphyrapus. The four-jointed 

 palp is directed somewhat outward. and closely beset along 

 the inner margin with strong incurving bristles. 



The Ist pair of legs (see figs. 6, 7) are. as in the 

 other forms belonging to this tribe, developed to exceedingly 

 powerful organs of prey. They have their origin ratber 

 close together, with a broad base. from the posterior part 

 of the ventral side of the cephalic segment, proceeding an- 

 teriorly. in a strong. S-shaped curve, along the sides of 

 the cephalic shield. The joints are exceedingly broad, some- 

 what compressed from the sides, and provided with powerful 

 muscles; the 2 last constitute together a vell- developed 

 chela, measuring about one-third of the length of the leg. 

 The fingers, scarcely at all shorter than the pahn. terminate 

 in a short. exceedingly curved. and horn-coloured point, and 

 exhibit, along the inner margin, a few irregular, dentiform 

 projections. that tit in between one another when the chela 

 is closed (see rig. 14). the points then crossing very prom- 

 ineiitly. 



The remaining pairs of legs (see figs. 5, ti I have all 

 about the same appearance, and represent the true pereio- 

 poda. They are exceedingly slender in form. with the 

 basal joint largest. but scarcely at all broader than the 

 other joints. The terminal claw is without exception quite 

 short and simple, the bristles, too. attached to these pairs 

 of legs being likewise small and few in number. 



The abdominal limbs (see figs. 8. 9) are in every sense 

 rudimentary, and so small as to be easily overlooked. Mean- 

 while, they are present in the usual number. and attached 

 close to the rounded lateral margins of the 5 anterior seg- 

 ments of the abdomen (see fig. 8). They consist as usual 

 of a basal part and 2 terminal plates; but the latter are 

 exceedingly small, and do not exhibit a trace of bristles; 

 hence these parts can by no means serve as nata tory or- 

 gans, for which, too. their small si/e must render them 

 wholly inefticient. 



The caudal appendages (see figs. 8, l<h are compara- 

 tively very short. not attaining by far the length of the 

 last segment, and have as a rule an oblique. inward direction 

 towards the medial line. so that. on viewing the animal 

 from above, it is generally the terminal bristles alone that 



