69 



Beskrivelse af Hiiiiiien. 



Jjæiigdcii af (le storste af luin' timlersoj^-tp Ex- 

 cmplavpr er, niaalt fra Panderaiiden til Kiuleii af 

 Halepladen, 24 mm. Dog synes det at være meget 

 sjeldent, at den iiaar en saa betydelig Storrtdse, og 

 18 — 20 mm. maa ansees for ( i jennemsnitsstorrelsen 

 1'or fnldt udviklede Individi-r, 



Som licis de ovrige til dcniif l'liyllii|iiidi'grnp]ie 

 horende Former, er (se Tab, XI, Fig. 1) Storste- 

 ]iarten af Tjegemet dækket oventil af et bredt, kun 

 svagt hvælvet llygskjold, livorved Legemsfcjrmen 

 faar et noget tladtrykt Udseende. Dette llygskiolil 

 er fortil fuldkommen sammenvoxct med Hovedet, 

 livorimod det bagtil kun lost da'kker den underlig- 

 gende Kro]), som frit kan bevæges under samme (,se 

 Fig. I3\ Sees Legemet ovenfra (Fig 1\ viser sig en 

 storre ellei' mindre I>el af Kr(>p|)i'n at rage frem 

 bagenfor Hygskjoldet i Form af en je\-nt afsnuil- 

 nende, noget cylindrisk Hale, endende uumI 2 lange, 

 divergerende Vedhseng, Halctraadpiie. nudlem hvilke 

 desuden rager frem en liden median llaleplade. 



Sees Legemet nedenfra (Fi<j 



^ger hele Dyrets 



l>ugllade med sine forskjellige Vedhæng frit for .Be- 

 skueren indenfor IJygskjoldets Coneavitet. Helt for- 

 til sees en fra Panderanden udgaaende halvniaaue- 

 formig glat Flade. umiddelbart bag hvilken Folerne 

 og Munddelene har sin Plads. l)erpaa folger den 

 lange llække af Fodder, der visei' et temnudig laens- 

 artet Udseende. Iste Par er ialmimleliglu'd lige ud- 

 strakt til hver Side, saa at det noget overrager 

 Siderandene af Hygskjoldet, medens de der]iaa fol- 

 gende 1() Par er mere indadkrunuiu'(le. dog saaledes, 

 at der mellem dem i Regelen altid hmles et aabent 

 Ittim, i Hunden af hvilket Kro|)pens Hugside sees i 

 1'oi-m af en snml rendeformig Fordybning, begrænd- 

 set til Siderne af de respective Fodders indadrettede 

 ("oxalla]i]ier. Længere bagtil indsnævres dette Hum, 

 og Fodderne ligger hei' tæt sammen som Bladene i 

 en Bog, aftagende gradvis i Storrelse. Den samlede 

 Fodniassi^ antager derved Fornu'u af en bagtil ven- 

 dende s]u'(ls Kegle. Den bagerste Did at Legemet 

 er rnb'U 1,1'mmr'r ng af simpid cylinilri-^k l'"iii'ni. 



Rygskjiddet viser, nveufi'a seet i Fig. 1). en bredt 

 oval Form, med Sidekanterne jevnt bued(> og foi'til 

 gaaende i et nu'd den ligeledes bueile Frontalrand 

 af Hovedet liagtil er det imget indsnævret og har 

 i Midten et dylit, vinkelformigt Indsnit, livis Kanter 

 er bevadinede nunl smaa s])idse Tagger. Oventil 

 sees i den forreste D(d en tydelig transversal For- 

 dylining, Xakkefuren, i i')Un(len af hvilken der er en 

 afrundet Tvau-vulst, der antyder ^landibularsegmen- 

 tet. Den foran Xakkefuren liggmde Del repvæsen- 

 terer Hovedet, der i Midten viser en stum])t afrun- 

 det Forhoining, paa hvilken de 2 sammensatte Oine 



Description ol" tlie Female. 



The length of the largest specimen examined 

 1)3^ me measured 24 mm. from the frontal margin to 

 the end of tlie eaiidal lamella. It seems, however, 

 very seldom that it attains so consideraljle a size, 

 and from 18 to 2t( nun. nuist he considered as the 

 average size for fully-developed animals 



As in the other forms belonging to this grouj) 

 of Phyllopoda. the greater part of the body (see 

 PI. XL tig. 1) is covered ahove hy a broad, only 

 slightly vaulted carajiaee, \vherel)y the body accpiires 

 a somewhat Hattened ap])earance. This cara|)aee 

 is completidy united in front with the head, whereas 

 posteriorly it only loosely covers the underlying 

 body, which can nifive freely beneath it (see tig. 3). 

 AVhen the animal is viewed from ahove (tig. 1), more 

 or less of tlie body is seen projecting from behind 

 the carapace in the form of an evenly tapering, 

 somewhat cylindrical tail, ending in two long, di- 

 vergent a])pendages, the c-audal filaments, between 

 which there also jirojects a snnill median caudal 

 lanudla. \\'hen viewed from below (tig. 2), the whole 

 , of the animals ventral surface with its various a]»- 

 pendages lies expf)sed to view within the concavity 

 of the carapace. Right in front, a crescent-shajied. 

 smooth surface is visible, starting from tin- frontal 

 margin, and inunediately hehiml this are situated 

 the antenna' and the oral pai'ts. Then follows the 

 long row of legs which present a sonn'what hetero- 

 geneous appearaiu-e. The first ])air is generally 

 extended eipially to both sides, so that it projects 

 a little beyond the lateral edges of the carapace, 

 while the following 10 ])airs are more bent inwards, 

 though in such a wa\-, that, as a i-ule, there is an 

 open space hetweiui them, at the bottom of which 

 the ventral surface of the body is visible in the 

 shape of a narrow groove bounded laterally' by the 

 inwardly inclined coxal lobes of the resj)ective legs. 

 Further batdv, this space is contracted, and the legs 

 lie as (lose together as leaves in a book, diminishing 

 gradualL' in size. The accumulated mass of legs 

 then assumes the form ot' a posteriorly jiointing 

 cone. The hindmost part of the body is witlunit 

 limbs, and in the form (d' a simple cylinder. 



"^rhe i-arapace, seen from above (tig. 1), is of a 

 l)r()ad oval sha])e with the lateral edges evenly 

 curved, and contiiuKuis with tlie likewise curved fron- 

 tal margin of the head. It is somewhat narrowed be- 

 hind, and has, in the middle, a dee]), angular inci- 

 sion, the edges (d' which arc armed with small, sharp 

 denticles In the anterior part ahove, may be seen 

 a distinct transversal hollow, the ci^rvical sulcus, 

 at the bott(Mn of which there is a rounded trans- 

 verse proniincnci', indicating the mandibular segment. 

 The region in front of the cervical furrow repre- 

 sents the head, and exhibits, in the centre, a bliintlv 



