22 



der danner den egentlige Stamme og er fremkommen ved 

 en Sammensmeltning af Endognath og Mesognath, gaar ud 

 i en smalt tungeformig, i den indre Knut børstebesat Lap, 

 uden nogen tydelig Leddeling. Den midterste Gren (Exog- 

 nath), der aabenbart svarer til den membranøse Plade paa 

 _'det Par Kjæver. er betydelig større og ligesom den indre 

 fortilrettet, samt bestaar at' en noget pladeformig, i den 

 ydre Kant tæt børstebesat Basaldel og en ganske tynd, 

 indadkrummet og stærkt bugtet Endesnært, hvis ydre Parti 

 er delt i korte med Pjærbørster besatte Led. Den ydre 

 Gren endelig (den saakaldte Epignath) har Formen af en 

 temmelig stor hudagtig. i to koniske Pliger — en fortil og 

 en bastilrettet -- udsraaende børsteløs Plade, 



2det Par Kjævefødder (Fig. 14) viser de samme Hoved- 

 dele som foregaaende Par. skjondt temmelig moditicerede i 

 sit Udseende. Navnlig er den indre Gren her betydelig 

 stærkere udviklet. dannende en paa Midten vinkelformigt 

 bøiet og indadkrummet Stamme, der er afdelt i 6 tydelige 

 Lcd. Af disse er det næstsidste storst og ligesom opsvulmet 

 paa Midten samt langs den ydre Kaut forsynet med talrige 

 lange og stive Børster. Sidste Led. tier ved en meget skjæv 

 Sutur er begrændset fra foregaaende, er ganske kort og 

 bevæbnet med flere ulige store Torner, hvoraf ;! udmærker 

 sig ved betydelig Længde. Exognathen, der er tiestet til 

 Ydersiden af Stammens 2det Led, bestaar ligesom paa fore- 

 gaaende Par af en noget sammentrykt Basaldel, der er 

 bredest ved Poden og her i den ydre Kant besat med 

 lange hoiede Fjærbørster, samt en tynd Endesnært. der er 

 rettet indad og mindre bugtet end paa Iste Par. Epignathen 

 er ogsaa her tilstede, men er betydelig mindre end paa 

 foregaaende Par og mangler ganske den fortilrettede Lap. 



3die Par Kjævefødder (Fig. 15) skiller sig væsentlig 

 fra de øvrige Munddele ved sin betydelige Størrelse og fod- 

 formige Bygning. 1 >e opnaar næsten hele Rygskjoldets 

 Længde og rager fortil adskilligt ud over 2det Par Foleres 

 Blad. Tilsyneladende bestaar disse Kjævefødders Stamme 

 kun af 4 Segmenter, et kort og tykt Rodled, et meget 

 langstrakt og noget bugtet "idet Led, et neppe halvt saa 

 stort ,'idie Led og et stærkt affladet, næsten spadeformigt 

 Endeled. Ved nøiere ITndersogelse tinder man dog. at 

 Rodleddet egentlig er sammensat af 2 ufuldstændigt begrænd- 

 sede Segmenter, hvoraf det 2det paa sin Yderside gaar ud 

 i en kort. tungeformig Flig. der imidlertid neppe, som 

 Kroyer mener, svarer til Epignathen paa de 2 foregaaende 

 Par. Fremdeles er der en vistnok svag Antydning til en 

 Sondring paa nreste Led af et kort Basalafsnit. fra hvis 

 \ derside den i Bygning og Storrelse med samme paa fore- 

 gaaende Par nøie overensstemmende Exognath udgaar. Ende- 

 lig bemærkes ved stærk Forstørrelse og Compression i Spid- 

 sen af sidste Segment et yderst lidet, men tydelig! afsat 

 Endeled. Leddenes Antal bliver saaledes egentlig 7, sva- 



brancb, which constitutes the actual trunk. and results from 

 a coalescence of the endognath and the mesognath. protends 

 as a slender. Knguiform lobule, beset along the inner margin 

 with bristles, and does not exhibit any distinct articulation. 

 The middle branch (exognath). which obviously corresponds 

 to the memhranous plate on the 2nd pair of maxillæ, is 

 considerably larger, and. like the innermost. directed an- 

 teriorly, consisting. too. of a somewbat lamellar basal portion, 

 denselv beset with bristles along the outer margin, and a 

 delicate, inwardly curving and exceedingly sinuous terminal 

 lash. the outer part of which is divided into short articula- 

 tions. beset with plumose bristles. Finally. the outermost 

 branch (the so-called epignath), cutaneous in substance and 

 without bristles, has the form of a comparatively large 

 plate, protending into two conical lobes — one directed 

 anteriorly and one posteriorly. 



The 2nd pair of maxillipeds (fig. 14) exhibit the same 

 principal parts as the foregoing pair. though of consider- 

 ably modified appearance. The innermost branch. in parti- 

 cular. is much more developed, constituting a geniculate 

 stem. curving inward. and divided into 6 distinct articula- 

 tions. Of these articulations, the penultimate is the largest, 

 and, as it were. tumified in the middle. and furnished along 

 the outer margin with numerous long and stift' bristles. 

 The last articulation. which. by an exceedingly oblique 

 suture. is separated trom that preceding it. is very short 

 and armed with several large spines. varying in length. .'5 

 of. which. however. are remarkably long. The exognath. 

 attached to the outer margin of the 2nd articulation of the 

 stem. consists, as does that on the preceding pair. of a 

 somewbat compressed basal portion, broadest at the root, 

 and beset along the outer margin with long. curving jilu- 

 mose bristles. baving also a slender terminal lash. directed 

 inwards. and less sinuous than that on the Ist pair. The 

 epignath is also present, though much smaller than that on 

 the preceding pair. the anteriorly directed lobe being 

 entirely wanting. 



The 3rd pair of maxillipeds (fig. 15) are chiefly distin- 

 guished from the other buccal åppendages hy their considerable 

 size and pediform structure. They attain almost the entire 

 length of the carapax. and, in front, project considerably 

 beyond the scale of the 2nd pair of antennæ. Apparently, 

 the stem of these maxillipeds consists of only 4 segments. 

 — a short and thick basal articulation. an exceedingly 

 elongate and very sinuous 2nd articulation. a 3rd articula- 

 tion, scarce ly half as large, and an extf emely flattened, almost 

 spatulate. terminal articulation. On closer examination. 

 however. the basal articulation is found to be composed 

 of 2 imperfectly separated segments, of which the 2nd 

 sends oft' from its outer margin a short. linguiform lappet, 

 that hardly. however. as assumed by Kroyer. can corre- 

 spond to the epignath on the 2 preceding pairs. Moreover, 

 on the next articulation there is a trace, faint indeed, 

 of a basal section, from the outer margin of which 

 proceeds the exognath. precisely similar in size and struc- 

 ture to that on the preceding pair. Finally. when ex- 

 amined under a powerful magnifier and highly compressed, 



