101 



den ovrige Krop. Hovedet er temmelig tykt, lige- 

 som opsvulmet i sit dorsale Parti, og stumpt 

 afkuttet tortil, nden Spor at noget Rostrum. Det 

 forlænger sig bagtil ]iaa Undersiden i en meget 

 voluminos Plade, der livælver sig \\d over Bugsiden 

 af Dyret og ender i en smal, konisk tillobende Fort- 

 sats. Denne Plade er den enormt ndviklede Over- 

 læbe (labrum). 1 det indre af Hovedet belt fortil 

 bemærkes i Midten en meget ioinefaldende blodrod 

 Pigmentmasse af noget uregelmæssig Form : det 

 enkle Øie. Af de sammensatte (Jine er der derimod 

 intetsomhelst Spor at se. Af Lemmer findes knn 

 3 Par, de saakaldte Nanplins-Lemmer, alle tilkorende 

 det forreste Afsnit af Legemet og repræsenterende 

 de 2 Par Folere og Mandibularfodderne. Det for- 

 reste Par (a') (Iste Par Folere) er dog saa smaa og 

 rudimentære, at de let kan oversees, og er heller 

 ikke bemærkede af LerebouUet. De har Formen af 

 2 ubetydelige knudeformige Fremspring til hver Side 

 af den forreste Ende af Hovedet og noget ventralt, 

 hver forsynet med en enkelt delicat Foleborste (se 

 ogsaa Fig.. 5 a). Det 2det Par Lemmer (a^), der re- 

 præsenterer 2det Par Folere, er derimod af særdeles 

 betydelig Storrelse, forestillende et Par kraftigt nd- 

 viklede, til Siderue udstrakte Aarer næsten af hele 

 Legemets Længde. Enhver af disse Lemmer bestaar 

 af et tykt cylindriskt Skaft og 2 noget nlige ud- 

 viklede Endegrene. Skaftet har ved Basis i Bag- 

 kanten en konisk Fortsats, der ender med en kort 

 borsteformig Spids, og ved dets Ende tindes, lige- 

 ledes i Bagkanten, en lignende, med en noget læn- 

 gere bagudkrummet Borste endende Fortsats. Af 

 (irenene er den ovre eller forreste noget storre end 

 den anden og omtrent af Skaftets halve Længde. 

 Den er noget opsvulmet jma Midten, næsten ten- 

 formig, og viser en meget utydelig Leddeling, samt 

 bærer 5 leddede, men endnu ucilierede Svomme- 

 borster, hvoraf de 3 ndgaar fra tilsvarende Afsatser 

 i den bagre eller ydre Kant, de 2 ovrige fra Spidsen. 

 Den bagre Gren er simpelt cylindrisk og delt i 



2 utydeligt sondrede Led, hvoraf det yderste har 

 ved Spidsen 3 Borster af et lignende Udseende som 

 de paa den forreste Gren. Det 3die Par Lemmer 

 (Mp), de saakaldte Mandibnlarfodder, hvoraf intet 

 Spor findes hos det voxne Dyr, udgaar omtrent fra 

 Midten af Legemet, paa (Irændsen mellem Hoved og 

 Krop, og er ligesom 2det Par udstrakte til hver 

 Side, skjondt sædvanlig noget mere bagudlioiede. 

 De udspringer hver fra en noget fortykket, knude- 

 formigt fremspringende Basis, som forestiller det 

 endnu nndviklede Corpus af Kindbakkerne. Hver 

 Mandibularfod bestaar af 3 ntvdeligt sondrede Led, 

 hvoraf det Iste er størst og forsynet i Bagkanten 

 med 2 ]ngformige Borster. 2det Led bærer en 

 enkelt lignende Borste, og sidste Led i Spidsen 



3 saadanne. Den bagenfor liggende Del af Legemet 

 er nden Spor af Lemmer og af aflang oval Form. 



remainder of the body. The head is rather tliiek 

 and as it were swollen in its dorsal region, and is 

 bluntly truncated in front, without any trace of a 

 rostrum. It is proilueed posteriorly on the inferior 

 side to a very voluminous plate, which arches over 

 the ventral side of th^ animal and ends in a narrow, 

 conical projection. This plate is the enormouslv 

 developed upper lip (labrum). Inside the head, in 

 the middle right in front, a rather irregularly- 

 shaped, very conspicudus mass of blood-red i)igment 

 is visible, — the ocellus. On the other hand, there 

 is no trace whatever of the compoimd eyes. There 

 are only 3 pairs of limbs, the so-called nauplius 

 limbs, all belonging to the anterior section of the 

 body, and representing the 2 pairs of antennæ, and 

 the mandibular legs. The foremost pair (a') (the 

 1st pair of antennæ) are, however, so .small and 

 rudimentary, that they can easily be overlooked, 

 and have not, indeed, Ijeen noticed Ijy Lerebonllet. 

 Thej^ are in the shape of 2 small, nodiform protu- 

 berances one on each side of the front end of the 

 head, and somewhat ventral, each furnished with a 

 single delicate sensory bristle (see also fig. 5 a). 

 The 2nd pair of limbs (a^), which lepresent the 2nd 

 pair of antennæ, are. (in the other hand, of very 

 considerable .size, forming a pair of powerfully 

 developed oars, extended laterally, and almost as 

 long as the body. Each of these limlis consists of 

 a thick cylindrical sca]ie, and 2 rather unequally 

 developed, terminal rami. At its base, in the hind 

 margin, the scajie has a conical projection, ending 

 in a short, Inistle-like point, and at its end, also in 

 the hind margin, a similar jn'ojection ending in a 

 rather longer bristle bending backwards. Of the 

 two rami the upper or foremo.st one is rather larger 

 than the other, being about half the length of 

 the scape. It is somewhat swollen in the middle, 

 almost fiisiform, and exhilnts a very indistinct arti- 

 culation; it also carries 5 jointed, but not as yet 

 cifiated natatory bristles, 3 of which issue from 

 corresponding ledges in the hinder or outer margin, 

 the other 2 from the point. The hind ramus is 

 of a simple cylindrical shape, and is divided into 



2 indistinctly defined joints, the outer of which has 

 at its point 3 bristles similar in appearance to 

 those on the front ramus. The 3rd pair of limbs 

 (Mp), the so-called mandibular legs, of which no 

 trace is to be found in the adult animal, issue from 

 about the middle of the bod^-, at the dividing line 

 between the head and the trunk, and, like the 

 second pair, extend one to each side, though gene- 

 rally bent rather more backwards. They each issne 

 from a somewhat thickened, nodiformly projecting 

 base, which represents the still undeveloped body 

 of the mandibles. Each mandibular leg consists of 



3 indistinctly defined joints, of which the 1st is the 

 largest, and is furnished, on the hind margin, with 



