63 



tydelig smekrere end hos Hunnen (se Tab. IX, Fig. 

 3 og 4, Tab. X, Fig. 6). De 2 Kjonsringe er tyde- 

 ligt adskilte i sit dorsale Parti og er, ovenfra seede, 

 neppe bredere end Trnncus. Derimod danner de 

 nedad en noget nregelmæssig Udvidning, hvorfra de 

 ydre KjønsvedliBeng udgaar. Disse sidste er for- 

 holdsvis storre end hos Bronchinecfa og af noget nær 

 cylindrisk Form, eller kun ganske svagt afsmalnende 

 mod Enden, og half det ydre Parti tæt besat med 

 fine Haar. Den bakenfor liggende Del, den egent- 

 lige Hale, afsmalnes gradvis bagtil og er, uligt hvad 

 Tilfældet er hosHunn«n, delt i (i tydeligt begrænd- 

 sede Segmenter, forudeh Halegrenene. Disse sidste 

 er fuldkommen af samme Udseende som hos Hunnen. 



Farve. — Legemet er Iros begge Kjon i levende 

 Tilstand meget gjennemsigtigt, saa at de indre Or- 

 ganer mere eller mindre tydeligt skinner igjennem 

 de tynde Integumenter. Hos Hunnerne har det ial- 

 mindelighed et svagt gronligt Anstrøg, medens det 

 hos Hannerne viser en lys gulagtig Tone. Dog va- 

 rierer Farven betydeligt hos begge Kjon efter Lo- 

 kaliteterne og spiller undertiden over i det blaalige 

 eller rodlige. Hos fuldt udviklede Hunner findes 

 meget constant (se Tab. IX, Fig. 1 og 2) paa Ryg- 

 siden af Kjonsregionen 2 sidestillede rudeformige 

 Pletter af en intensiv ultramarinblaa Farve og ind- 

 fattede af en mørkere Kant. Enhver af disse Plet- 

 ter forlænger sig sædvanligvis fortil i en smal Stribe 

 af samme Farve, og mellem begge disse sees ialmin- 

 delighed 2 andre tæt sammenstillede Længdestriber 

 af en lignende Couleur. Den forreste Del af Æg- 

 beholderen er i Regelen orangefarvet, medens den 

 bagerste Del viser nogle uregelmæssige violette 

 Shatteringer. De i Ægbeholderen indsluttede Æg 

 er morkt grønfarvede. Hos Hannerne er ofte Spid- 

 serne af Gribeantennernes Grene mere eller mindre 

 tydeligt or angef arvede, og undertiden det bagerste 

 Segment af Halen violet anstrøget (se Tab. IX, Fig 

 3 og 4). 



ludre Organer. 



Tarmen strækker sig, som hos Branchinecfa, i 

 Form af et simpelt cylindriskt Rør igjennem hele 

 Legemet (se Tab. IX, Fig. 1 — 4), og er ialmindelig- 

 lied fyldt med orangefarvet Indhold, der bagtil grad- 

 vis antager en mørkere brunagtig Farve. I Hovedet 

 udgaar fra Forenden af Tarmrøret 2 korte Blind- 

 sække af en lignende Structur som hos Branchinecta. 

 Spiserøret (Tab. X, Fig. 4, 5, o) viser ved sin For- 

 bindelse med Tarmrøret en eiendommelig klapformig 

 Indretning, ligesom der paa dette Sted findes et 

 Slags chitinagtigt Støtteapparat besat med et Antal 

 af stærke, i Tarmens indre frit fremspringende børste- 

 formiffe Fortsatser, cilierede i Kanterne. Endetar- 



hand, is very different to, and much more slender 

 than that of the female (see PI. IX, figs. 3 and 4; 

 PI. X, fig. IG). The two genital segments are dis- 

 tinctly separated in their dorsal part, and, when 

 seen from above, are scarcely broader than the 

 trunk. Below, however, they form a somewhat irre- 

 gular expansion, from which the external sexual 

 appendages issue. The latter are relatively larger 

 than in Branchinecia, and nearly cylindrical in form, 

 being only very slightly tapered towards the end, 

 and with the outer part covered with fine hairs. 

 The posterior portion, or tail proper, tapers gradu- 

 ally towards the end, and, unlike that of the female, 

 is divided into 6 distinctly-defined segments, besides 

 the caudal rami. The latter are of exactly the 

 same appearance as those of tlie female. 



Colour. — In the living state, the body in both 

 sexes is very transparent, so that the internal or- 

 gans are traced more or less distinctly through the 

 thin integuments. In the females, it has generally 

 a faint tinge of green, while in the males, it exhi- 

 bits a light yellow shade. The colour varies, how- 

 ever, considerably in both sexes, according to the 

 localities, and sometimes has a blue or a red tint. 

 In fully developed females, there is very generally 

 found (see PL IX. figs. 1 and 2) on the dorsal side 

 of the sexual region, 2 juxtaposed, diamond-shaped 

 patches of an intense iiltramarine-blue, surrounded 

 by a darker rim. Each of these patches is generally 

 prolonged anteriorly into a narrow stripe of the 

 same colour, and between them are generally to be 

 seen two other longitudinal stripes of the same 

 colour, placed close together. The anterior portion 

 of the mar.supium is, as a rule, orange-coloured, 

 while the posterior part exhibits some irregular 

 pirrple markings. The eggs enclosed in the marsu- 

 pium are of a dark green colour. In the males, the 

 tips of the rami of the prehensile antennae are fre- 

 quently more or less distinctly orange-coloured, and 

 the hindmost segment of the tail is often tinged 

 with purple (see PL IX, figs. 3 and 4). 



luteriial Organs. 



As in Brancliinecta, the intestine runs in the 

 shape of a simple cylindrical tube throughout the 

 length of the body (see PL IX, figs. 1 — 4), its con- 

 tents being generally of an orange-colour, gradually 

 assuming a darker brown hue posteriorly. From 

 the anterior end of the intestinal tube, in the head, 

 there issue 2 short cæea of a structure similiar to 

 that in Branchinecfa. The æsophagus (PL X, figs. 

 4, 5, o) exhibits at its junction with the intestinal 

 tube, a peculiar valve-like arrangement, and also at 

 the same place a kind of chitinous support, clothed 

 with a number of strong, setiform spikes with cili- 

 ated edges, freely projecting inside the intestine. 



