15 



og uden fiiiliver Borstebevæbning. 2det Led, der 

 omtrent er af samme Størrelse som Iste, mangler 

 ligeledes Børster, men gaar fortil nd i et kort tand- 

 formigt Fremspring. Den ydre Del af Skaftet dan- 

 ner ogsaa her en stærk knæformig Beining med fore- 

 gaaende Led, men bestaar kun af et enkelt Led, paa 

 hvilket dog en oprindelig Tvedeling er ant^'det ved 

 en skarpt markeret Afsats baade fortil og bagtil ^). 

 Til den bagre Afsats er fæstet en stærk Fjærborste, 

 og langs Forkanten af Leddet findes en hel Del saa- 

 (ianne Børster, tildels af betydelig Længde. navnlig 

 ved Enden, hvor de delvis er krandsformigt stillede 

 omkring Leddet. Desuden findes langs den øvre 

 Halvpart af Forkanten en Rad af Smaatorner, der 

 nedad siiccessivt tiltager i Længde, og en Del lig- 

 nende Torner bemærkes ogsaa ved Enden af Leddet 

 fortil niellem Børsterne. Svøben er betydelig (næ- 

 sten dobbelt) længere end paa de ovre Følere og 

 bestaar af omkring 20 børstebesatte Led, hvoraf dog 

 de '^ eller 4 inderste er mindre tydeligt begrændsede. 

 Hos den endnu ikke slægtsraodent ndviklede Han 

 skiller disse Følere (Fig. 1, a^) sig væsentlig kun 

 derved, at Svøben er meget tæt ringet, eller delt i 

 et stort Antal, endnu ufuldstændisrt besrrændsede Led. 



Overlæben [Fig. 7, L. Fig. 8), der til Siderne 

 ganske dækkes af de nedre Foleres Basalled. danner 

 et tydeligt convext Fremspring af afrundet Form og 

 med den bagre Kant svagt indhugtet i Midten samt 

 her liesat med fine Haar. 



Underlæben (Fig. 7, 1, Fig. H) er meget liden 

 og vanskelig at isolere. Den iiar imidlertid fore- 

 kommet mig at frembyde det Fig. 9 fremstillede 

 Udseende af en i Midten dybt indskaaret og delvis 

 cilieret Plade. 



Kindbakkerne (Fig, 1, M, Fig. 1(») har et for- 

 holdsvis meget lidet Corpus, hvis ydre Del er baad- 

 formig og ender opad i en Spids, hvormed det arti- 

 culerer til Rygskjoldets indre Flade. Dets indre 

 Hule er fyJdt med de stærke. i Midten ved en chitin- 

 agtig Sene forliundne Adductormnskler (se Fig. 10), 

 og fra den bagre Kant udgaar en tynd Chitinsene, 

 hvortil Kindbakkernes Rotationsmuskler fæster sig. 

 Den næsten under en ret Vinkel med det ovrisre 

 Corpus indboiede Tj-ggedel er (se Fig. 11) i Enden 

 delt i 2 Grene, hvoraf den ydre har Formen af en 

 liden triangulær Lamelle, der svarer til det tandede 

 Parti (cTitting edge) hos andre Crustaceer, medens 



the head, strongly muscnlous, and without any ar- 

 mature of bristles. The 2nd joint, which is about 

 the same size as the 1st one, is also quite deficient 

 in bristles, but passes, in front, into a short denti- 

 form projection. The outer part of the peduncle 

 also forms here a strongly geniculated bend ^vith 

 the preceding joint, but consists of only a single 

 joint, upon which, however, there is an indication 

 of an original subdivision in the shape of a sharply 

 defined ledge both in front and behind '). Attached 

 to the posterior ledge there is a powerful plu- 

 mose bristle, and along the anterior edge of the joint 

 quite a number of such bristles may be observed, 

 partly of considerable length, especialh' at the ex- 

 tremity, where they are partly arranged in a ver- 

 ticillate manner around the joint. Further, there 

 may be observed along the upper half of the an- 

 terior edge a series of small spines, which gradu- 

 ally increase in length below; and a number of 

 similiar spines are also observed at the extremitj' 

 of the joint in front, between the bristles. The fla- 

 gellum is considerably longer (nearly double) than 

 on the siiperior antennæ, aaid consists of about 20 

 joints beset with bristles, of which, however, the 

 3 or 4 innermost ones are less distinctly defined. 

 In the not yet sexually fully developed male 

 these antennæ distinguish themselves chiefly (fig. 

 1, a^), only by the circumstance that the flagellum 

 is very closely annulated, or divided into a large 

 number of still imperfectly defined joints. 



The anterior lip (fig. 7 L, fig. 8) which, at the 

 sides, is quite covered by the basal joints of tlie 

 inferior antennæ, forms a distinctl}^ convex promi- 

 nence of rounded form, witb the posterior margin 

 faintly hollowed in the middle and l)eset here with 

 delicate hairs. 



The posterior lip (fig. 7 1, tig. V) is verj^ small 

 and difficult to isolate. It appears, however, to me, 

 to present the appearance of a parth- ciliate lamella, 

 deeply incised in the middle, as shown in fig. it. 



The mandibles (fig. 1, M, fig. 10) have, relati- 

 vely, a very small corpus, whose outer portion is 

 navicular in form and terminates above in a jioint, by 

 which it articulates with the inner surface of the 

 carapace. Its inner cavity is occupied by the pow- 

 erful adductor muscles, which are connected in the 

 middle by a chitinous tendon (see fig. 10). and from 

 the posterior margin a thin chitinous tendon issues, 

 to which the rotatory muscles of the mandibles are 

 attached. The masticatorj- part, which is bent 

 inwards almost at a right angle to tiie remaining 

 corpus (see fig 11). is divided at the exti'emity into 

 2 rami, of which the outer has the form of a 



') Ho.s SI. Kcbaliopiiis best.a.ir denne Del :if 

 crrændsede Led. 



tvdeligt be- 



') 111 the gen. Xchnliojistis this [lait consits of 2 distinctly 

 detincd joints. 



