88 



Svøben er omtrent af samme Længde som Skaftets sidste 

 Led og særdeles tynd. Dens Iste Led er meget lidet saa 

 at det let vil kunne oversees: cleiimod er de 2 følgende 

 Led temmelig forlangede, og ethvert af dem hengere end 

 de 2 sidste Led tilsammen. Foruden nogle simple Børster 

 er til Knelen at hvert af de 3 sidste Led fæstet en klar 

 sta vformig Sandsehorste. 



Paa 2det Par Følere (Fig. 5) kan ligeledes adskilles 

 Skaft og Svøbe; men Skaftet bestaar lier af 5 Led. bvoraf 

 de 3 første er meget korte og delvis sangtakkede i Kan- 

 terne, medens sidste Led ogsaa hei' er stærkt forlænget og 

 ved Spidsen forsynet med 4 stærkt udviklede Hørebørster. 

 Svøben er noget længere end Skaftets sidste Léd og jevnt 

 afsmalnende mod Spidsen samt sammensat af 8 korte, med 

 simple Borster besatte Led. 



De saakaldte Kindbakker (Fig. G). der dog. som |af 

 Prof. Dobrn (1. c. ) paavist. baade ifølge sin Stilling i For- 

 hold til Mundaahningen og sin Udvikling. neppe kan be- 

 traktes som homologe med Kindbakkerne bos andre Cru- 

 staceer. er fæstede til Hovedets forreste Rand og rager 

 frit frem foran samme, idet de som Tænger kan bevæges i 

 borizontal Retning imod hinandeii. De er i Sammenligning 

 med andre Arter ikke meget store, med af den sædvanlige 

 Form. noget indknehne ved Basis og pladeformigt udvidede 

 mod Enden, med Spidsen leformigt mdadkrummet og den 

 indre Kant tilskjærpet og glat. dannende paa Midten en 

 fremstaaende Vinkel. Ligeoverfor denne Vinkel bemærkes 

 paa den ydre convexe Rand en liden. noget uregebnæssig 

 Afsats som Antydning til et tandformigt Fremspring. 



Af andre Munddele er kun 2 Par tilstede, der er 

 fæstede til det bagerste Parti af Hovedsegmentet og lige- 

 ledes i betydelig Afstand fra selve Mundaabningen. Denne 

 sidste sees som en ubetydelig simpelt cirkelformig eller noget 

 elliptisk Aabning omtrent i Midten af den fordybede Mund- 

 area (se Fig. 3). 



Det ene af disse Par (Fig. 7) udspringer tæt sammen 

 ved den bagerste Hel af Mundarean (se Fig 3) og dækkes 

 fuldstændigt af det 2det Par (se fig. 2). Saavel ifølge sin 

 Beliggenhed som Bygning er det heromhandlede Par Lem- 

 mer at opfatte som de egentlige Kjævefødder. hvoraf altsaa 

 følger, at Kjæver ganske mangler. De er af blod og mem- 

 branøs Beskaffenbed samt halvt gjennemsigtige og bestaar 

 af en bred muskuløs Basaldel, der paa den indre Side løber 

 ud i en kort fingerformig Fortsats (Tyggelap). og en mod 

 Spidsen noget afsmalnende Endedel eller Palpe. Denne er 

 sammensat af 4 pladeformige Led eller Segmenter, hvoraf 

 det 2det er storst. Alle disse Led er langs sin ydre Kant 

 forsynede med en regelmæssig Rad af stærke, udadbøiede 

 Fjærbørster. 



Det 2de1 Par til Hovedsegmentet fæstede Lemmer 

 (Fig. 8) viser et meget eiendommelig! Udseende. idet de 

 som et Par mægtige Valvler hvælver sig over den hele 



the extremity. on one side. 2 so-called auditory bristles. 

 The riagellum is about of the same length as the last joint 

 of the peduncle, and remarkably slender. Its Ist joint is 

 veiv small, so minute indeed as to be easily overlooked; 

 on the other hand, the 2 succeeding joints are rather elongate. 

 each being longer than the 2 terminal joints tåken together. 

 Exclusive of a few simple bristles. a pellucid. baculiform. 

 sensory bristle is attached to the extremity of each of the 

 3 terminal joints. 



On the 2nd pair of antennæ (fig. oi. a peduncle and 

 a riagellum can likewise be distinguisbed; but the peduncle 

 consists of o joints, of which the 3 first are verv short. 

 and in part serrate along the margins, whereas the last joint 

 is here, too, very considerably elongate. and at the point 

 provided with 4 strongly developed auditory bristles. The 

 flagellum is somewhat longer than the last joint of the 

 peduncle. aud tapers gradually toward the point: it consists 

 of 8 short joints, beset with simple bristles. 



The so-called mandihles (fig. ti), which. however. as 

 pointed out by Professor Dohm (1. c), both regarding their 

 position relative to the buccal oririce and their general 

 development, can scarcely be held as homologous with 

 the mandibles in other Crustaceaiis. are attached to the 

 foremost margin of the head. and project freely forward 

 before it. adniitting of being moved horizontally one toward 

 tbe other. like a pair of forceps. Thev are. as compared 

 with other species. not particularly large, but of the usual 

 form. somewhat constricted at the base and lamelliform- 

 dilated toward the extremity. with the point falciform-in- 

 curved, and the inner margin sharp and smooth and forming 

 in the middle a- protuberant angle. Opposite to this angle, 

 is observed. on the outer convex margin, a small, somewhat 

 irregular ledge. constituting a rudiment of the usual denti- 

 form projection. 



Of other oral appendages 2 pairs only are present, 

 attached to the hindermost part of the cephalic segment. 

 and likewise at a considerable distance from the buccal 

 orifice. The latter has the appearance of a small, circular. 

 or somewhat elliptic. opening. placed about in the middle 

 of the depressed buccal area f see fig. 3). 



One of these pairs (fig. 7) spring, close together — 

 and wholly covered by the 2nd pair (see fig. 2) - - from 

 the hindermost portion of the buccal area (see fig. 3). 

 Both by reason of their position and their structure. the 

 said pair of appendages must be regarded as the true nia x- 

 illipeds; aud hence maxillæ are entirely wanting. They 

 art' soft and membranous in eharacter. as also semi-translu- 

 cent. and consist of a broad, muscular basal portion, which. 

 on the inner side. juts out as a short. dactyiiform projection 

 (niasticatory lobe>. and of a somewhat tapering terminal 

 portion, or palp. The latter is composed of 4 lamelliform 

 joints, or segments, of which the 2nd is largest. All these 

 joints are furnished along their outer margin with a regular 

 series of strong. outward-curving. plumose bristles. 



The 2nd pair of appendages ('fig. 8). attached to the 

 cephalic segment, present a very peculiar appearance. arching 

 over as they do. like a. pair of enormous valves, the whole of the 



