21 



De er paa Midten stærkt, næsten bøileirømigt krummede, 

 med den indad mod Munden fremspringende Arm. der synes 

 at svare til Tyggefortsatsen hos de egentlige Carider, megel 

 saml. cylindrisk. dog noget advidet i Enden. Denne er 

 paa begge Kindbakker kløftet til 4 spidse, parvis stillede 

 Tænder, hvoraf de to mere eller mindre dækker de to 

 øvrige (se Fig. 10). Khulbakkerne er helt igjennem chiti- 

 niseredé, og navnlig den omtalte mod Mumien rettede Arm 

 (pars incisiva) ai' temmelig fast Consistens og intensiv gul- 

 brun Farve. 



Iste Par Kjæver (Fig. 11 i bestaaraf 3 fra en tykkere 

 Rodde! udgaaende Grener eller Lapper. Den indre a f disse 

 er smalt tungeformig og ved den afrundede Ende forsynet 

 med fine Borster. Den midterste (iren er betydelig kraf- 

 tigere udviklet og synes at danne den umiddelbare Fortsæt- 

 telse af Roddelen. Den er stærkt indadkrummet og paa den 

 tvært afskaarne Ende bevæbnet med 4 stærke Torner formlen 

 en hel Del fine Børster. Hegge disse Grener er rettede 

 indad mod Mundaabningen og forestiller den egentlige Kjæve- 

 del (Endognath). Den ydre (iren. der er tiestet til Yder- 

 siden af den midterste og noget høiere oppe end den inderste 

 er uligt de 2 øvrige rettet udåd. Den er af en lignende 

 smal tungedannet Form som den indre, men af niere mem- 

 branøs Beskaffenhed og langs den ydre Kant besat med 

 omtrent 14 korte Fjærbørster og i Spidsen med en enkelt 

 simpel Børste. lalmindelighed har man betegnet denne 

 (-iren som Exognathen; men den svarer aabenbart ikke til 

 hvad man benævner saa paa de øvrige Munddele, men 

 snarere til den saakaldte Mesognath. Den egentlige Exo- 

 gnath mangler her eller er ganske rudimentær. 



2det Par Kjæver (Fig. 12) er fuldstændig pladefor- 

 aiige og af membranøs Beskaffenhed. Den egentlige Kjæve- 

 del (Endognath). der hos andre Macrwrer sædvanlig bestaar 

 af 4 indadrettede Tyggelapper, er her ganske rudimentær, 

 kun dannende en lidet fremtrædende, med nogle faa simple 

 Borster besat Knude. Umiddelbart foran denne Knude ud- 

 gaar en smal. i Enden børstebesat Fortsats. som forestiller 

 den saakaldte Mesognath. Størsteparten af disse Kjæver 

 indtages af en meget stor. fra den ydre Side af Roddelen 

 udgaaende membranøs Plade, der maa betragtes som homolog 

 med den saakaldte Exognath paa Kjævefødderne. Paa denne 

 Plade kan adskilles en fortilrettet, i Enden bredt afrundet 

 og langs Kanterne med en regelmæssig Rad af Fjærbørster 

 besat Del, samt en lige bagudrettet, smalt tungeformig Flig, 

 der er af betydelig Lengde, og ved Spidsen forsynet med 

 Uere overordentlig lange og tynde, bagud og indad krum- 

 mede Borster. Hele denne Plade benævnes sædvanlig Viften 

 (flabellum), et Navn. der godt passer til dens F unction; men 

 det er at bemærke, at den morphologiskt ikke svarer til 

 hvad man kakler saa paa de følgende Munddele. 



Iste Par Kjævefødder (Fig. 13) er ligeledes hoved- 

 af membranøs Beskaffenhed og bestaar af 3 for- 

 skjellet formede Hoveddele eller Girene. Den indre (iren. 



• 



feeble. In the middle they are exceedingly curved, in the 

 shape almost of a bow. with the terminal portion projecting 

 inward towards the niouth and apparently corresponding 

 to the molar projection in the true Caridæ, exceedingly 

 narrow. cylindric, hut somewhat dilated at the extremity. 

 On both mandibles, tliis extremity is cleft into 4 acutely 

 pointed teeth, arranged in pairs, two of the teeth to a 

 greater or less extent covering the others (see fig. tO). 

 The mandibles are chitiuous throughout, the terminal portion 

 tjiitiv incisiva) in particular being of a firm consistence 

 and of a deep yellowish-brown colour. 



The Ist pair of maxillæ (fig. 11) consist each of 3 

 branches or lobes, proceeding from a thickish basal part. The 

 innermost of these is slender linguiform, and. at the rounded 

 extremity, furnished with delicate bristles. The middle 

 branch is nmch mon' powerfully developed, and would 

 appear to constitute the immediate continuation of the 

 basal part. It is bent very considerably forwards and, at 

 the truncate extremity. provided with 4 powerful spines, 

 exclusive of uumerous delicate bristles. The outer branch, 

 attached to the exterior margin of the median, and a trirle 

 higher up than the innermost, is, contrary to what is the case 

 with the 2 others. directed outwards. Like the inner branch. 

 it is slender linguiform. hut mure membranaceous in char- 

 acter, and beset along the outer margin with about 14 short 

 plumose bristles. a simple bristle projecting from the point. 

 Grenerally, this branch has been termed the exognath: but 

 it certainlv does not correspond to «hat is thus designated 

 on the other buccal parts — rather, one would opine, tu 

 the so-called mesognath. The true exognath is wanting 

 here, or must at least be quite rudimentary. 



The 2nd pair of maxillæ (rig. 12) are quite lamellar 

 in form and of membranous structure. The true maxilla.ry 

 portion (endognath). which, in other Macrura, generally 

 consists of 4 hrwardly directed masticatory lobes, is in 

 this animal quite rudimentary. constituting merely a small 

 protuberant knob, beset with a few simple bristles. Iiniiie- 

 diately in front of this prominence, extends a slender prohv 

 tion furnished at the extremity with bristles. constituting 

 the so-called mesognath. The greater part of these maxillæ 

 occupy an extremely large membranous plate, proceeding 

 from the outer margin of the basal part. aud which must 

 be regarded as homologous with the so-called exognath mi 

 the maxillipeds. On this plate can be distinguished a divi- 

 sion, anteriorly directed. broadly rounded at the extremity, 

 and furnished along the edges with a regular row of plumose 

 bristles, as also a slender, linguiform lappet, directed straight 

 backwards, of very considerable length, and at the point 

 having several exceedingly long and delicate. posteriorly and 

 inwardly curving bristles. The whole of this plate is gen- 

 erally termed the fan (flabdlwm), a naine well lieritting its 

 luiiction: we must. however, bear in miud that, morpholog- 

 ically. it does not correspond to what is thus designated on 

 the following buccal parts. 



The Ist pair of maxillipeds (rig. 13) are likewise 

 chictly membranaceous in substance. and consist of 3 diff- 

 erently formed principal parts or branches. The innermost 



