16 



den indre og betydelig større Gren svarer til Molar- 

 processen. Den første er ganske simpel og bar kun 

 strax indenfor Spidsen et yderst lidet tandformigt 

 Fremspring. Den sidste er af cylindrisk Form, lidt 

 buet, og har som sædvanlig Enden fint riflet samt 

 mere tvært afknttet paa høire end paa venstre 

 Kindbakke. Palpen (Fig. 1, 7, Mp, Fig. 10). der ud- 

 gaar fra Corpus noget fortil paa det Sted, hvor 

 T3-ggedelen forbinder sig med den ydre, baadformige 

 Del, er af særdeles betj'delig Størrelse, næsten 3 

 Gange saa lang som selve Corpus, og viser en Byg- 

 nins idethele overensstemmende med samme bos 

 høiere Crustaceer, navnlig Ampbipoderne. Den be- 

 staar af 3 skarpt begrændsede Segmenter eller Led, 

 alle omtrent af ens Størrelse, eller kun ganske lidt 

 tUtagende i Længde udåd. Iste Led er simpelt cylin- 

 driskt, dog noget fortykket i hver Ende, og mangler 

 ganske Børster. Det forbinder sig med 2det Led 

 paa en ganske egen Maade, saa at begge med bin- 

 anden danner et Slag.': Knæ. 2det Led er i sit ba- 

 sale Parti noget opsvulmet og danner umiddelbart 

 indenfor Ledfoiningen med Iste, en albuformig Ud- 

 vidning. Det afsmalnes successivt mod Enden og 

 har i Midten af Yderkanten 3 — o tynde Børster. 

 Sidste Led, der er meget bevægeligt forbundet med 

 2det, er temmelig smalt, stærkt sammentrykt fra 

 Siderne og ganske lidt bredere i sit ydre Parti, som 

 er jevnt tilrundet i Enden. Det bærer langs den 

 nedadvendte skarpe Kant en tæt Rad af fint cili- 

 erede, toleddede Børster og har desiiden ved Spid- 

 sen nok en E,ad af meget fine og stærkt krummede 

 Børster. Leddets ovre Kant mangler Børster, men 

 viser i sit bagre Parti en særdele.s fin Ciliering. 

 I sin normale Situs convergerer de to Palper stærkt 

 ved Basis (se Fig. 10), saa at 2det Led paa begge 

 kommer til at ligge tæt sammen i Jiixtaposition, 

 indenfor Basal leddene af de 2 Par Følere. Sidste 

 Led paa hver divergerer igjen noget og træder frit 

 frem enten foran eller mellem Følernes Rod (se 

 Fig. 1, Mp). 



Iste Par Kjæver (Tab. II, Fig. 1 & 7. m', Tab. 

 III. Fig. 1) er af afrundet Form og gaar indad ud 

 i to korte, stumpt afrundede Tyggelappe, hvoraf den 

 ydre er størst, næsten af øxedannet Form og, foruden 

 med nogle tildels cilierede Børster, bevæbnet i sit 

 bagre Parti med en Gruppe af smaa, i Enden tve- 

 delte Torner (Fig. 1 a). Den indre Tyggelap er for- 

 lioldsvis liden, af membranøs Beskaffenbed og paa 

 den næsten tvært afkuttede Ende forsynet med en 

 tæt Rad af særdeles fine cilierede Børster, foriiden 

 en Del korte Torner. Fra Enden af disse Kjæver 



small triangular lamella, -which corresponds to the 

 denticular portion (cutting edge) in other Crusta- 

 ceans; while 'the inner, considerably larger ramus 

 corresponds to the molar expansion. The first-named 

 is quite simple, and has, immediately inside the point, 

 only an extremely small dentiform prominence. The 

 last-named is cylindrical in form, slightly curved, 

 and, as usual, has the extremity finely fluted and 

 more obtusely truncated on the right than on the 

 left mandible. The palp, (fig. 1, 7, Mp. fig. 10), 

 which isisiies from the corpus a little in advance 

 of the place where the masticatory part is con- 

 nected to the outer navicular part, is of parti- 

 ciilarly large size, almost 3 times as long as the 

 corpus itself, and exhibits a structiire corresponding, 

 upon the whole, with that of the higher Crustaceans, 

 especially the Amphipods. It consists of 3 sharply 

 defined segments or joints, all of about the same 

 size, or only quite slightly increasing in length out- 

 wards. The 1st joint is simple cylindrie in form but 

 somewhat tumefied at each extremity, and is quite 

 devoid of bristles. It is connected to the 2nd joint 

 in quite a peculiar manner, so that thej^ form with 

 each other a kind of knee. The 2nd joint is some- 

 what tumefied in its basal part, and forms imme- 

 diately inside the articulation to the 1st joint an 

 elbow-shaped expansion. It diminishes gradually 

 towards the extremity, and has 4 — 5 slender brist- 

 les on the middle of the outer margin. The ter- 

 minal joint, which is very flexibly connected to the 

 2nd one, is pretty narrow, strongly compressed from 

 the sides and quite slightly broader in its outer 

 part, which is evenly rounded at the extremity. It 

 bears along the downward bent sharp margin a 

 close series of delicate double-jointed bristles, and 

 has, further, at the point, yet another series of vei-y 

 delicate and strongly bent bristles. The u])per mar- 

 gin of the joint has no bristles, but exhibits a parti- 

 cularh- delicate ciliation in its posterior part. In 

 its normal situs the 2 palpi converge strongly at 

 the base (see fig. 10), so that the 2nd joint of each 

 lies in close juxtaposition inside the basal joints 

 of the 2 pairs of antennæ. The terminal joint of 

 each diverges again a little, and appears freely 

 forward either in front of or between the bases of 

 the antennæ (see fig. 1, Mp). 



The 1st pair of maxillæ (Pl. II, figs 1 and 7. 

 m'; PI. Ill, fig. 1) are rounded in form and pass over, 

 inwards, into two short, obtusely rounded mastica- 

 tory lobes, of which the outer one is the largest, 

 almost securiform, and armed, besides with some 

 partly ciliate bristles, also, in its posterior part, 

 with a group of minute spines bifurcated at the ex- 

 tremity (fig. 1 a). The inner masticatory lobe is 

 relatively small, of membi-anons nature, and fur- 

 nished on the almost obtusely truncated extremity 

 with a close series of delicate ciliate bristles besides 



