101 



den ovrige ivroj). Huveilet er temmelift- t\'kt, lige- 

 som opsvulmet i sit dorsale Parti, og stumpt 

 atkuttet tbrtil, udeu .Spor at' noget Rostrum. Det 

 torltenger sig bagtil paa Undersiden i en meget 

 voluminos Plade, der hvælver sig ud over Bugsiden 

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

 sats. Denne Plade er den enormt udviklede Over- 

 læbe (labrum). I det indre af Hovedet lielt tbrtil 

 'nemærkes i Midten en meget ioinefaldende blodrod 

 Pigmentmasse af noget uregelmæssig Form : det 

 enkle Øie. Af de sammensatte Øine er der derimod 

 intetsomhelst Spor at se. Af Lemmer tindes kun 

 3 Par, de saakaldte Nauplius-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 keiler 

 ikke bemærkede af Lereboullet. De har Formen af 

 2 nl)etydelige knudeformige Fremspring til hver Side 

 af den forreste Ende af Hovedet og noget ventralt, 

 hvrr forsynet med en enkelt delieat Foleborste (se 

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

 l)ræsenterer 2det Par Folere, er derimod af særdele.s 

 betydelig Storrelse, forestillende et Par kraftigt ud- 

 viklede, til Siderne udstrakte Aarer næsten af hele 

 Legemets Ijængde. Fnliver af disse Lemmer 1)estaar 

 af et tykt cylindri.skt Skaft og 2 noget nlige ud- 

 \iklede Endegrene. Skaftet har ved Basis i Bag- 

 kanten en konisk Fortsats, der ender med en kort 

 børsteformig Spids, og ved dets Ende tindes, lige- 

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

 gere bagudkrummet Borste endende Fortsats. Af 

 (-Jrenene er diMi ovre eller forreste noget storre end 

 den anden og ,.mtrent af Skaftets halve Længde. 



1 )eii er noget opsvulmet paa Midten, næ.sten ten- 

 formig, og viser en meget utydelig Leddeling, samt 

 bærer 5 leddede, men endim ucilierede Svomme- 

 borster, hvoraf de 3 uilgaai- fra tilsvarende Afsatser 

 i den bagre eller ydre Ivant. de 2 ovrige fra Spidsen. 

 Den liagre Gren er simpelt oylindrisk og delt i 



2 ntydeligt sondrede Led, hvoraf det yderste har 

 ved Sjiidsen 3 Horster af et lignende ITdseende som 

 de paa den foi'ri'ste (ii'iMi. Det 3dii' i'ar Lfiiinier 

 (Mp), de saakaldte Mandilmlarfodder, hvoraf intet 

 Spor tindes iios det voxne Dyr, udgaar omtrent fra 

 Midten af Legemet, ])aa (ira^ndsen meileni Hnvcd og 

 Krop, og er ligesom 2det Par udstrakte til hver 

 Side, skjondt sa'dvaniig noget mere bagudboiede. 

 De udspringer hver fra en noget fortyi<ket, kniide- 

 foi'migt frenis])ringende Basis, s(nn forestiller det 

 endnu uudviklede Corjins af Kindliakkerne. Hver 

 Mandibularfod bestaar af 3 ut\deligt sondrede Led, 

 hvoraf det Iste er størst og forsynet i l>agkanten 

 med 2 pigformige Børster. 2det Led bærer en 

 enkelt lignende Børste, og sidste Led i Spidsen 



3 saadanne. Den bagenfor liggende Del af Legemet 

 er uden Spor af Lennner og af atlang oval Fonn. 



remainder of tiie body. The head is rather tiiiek 

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

 lduntl\- truncated in front, without any trace of a 

 rostrum. It is ])roduced posteriorly on the inferior 

 side to a very voluminous plate, whieii arches over 

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

 conical [)rojection. This plate is the enormously 

 devel(»ped upper li]) (labrum). Inside the head, in 

 the middle rigiit in front, a rather irregularlv- 

 shaped, very cons])icuous mass of bloodred jiignient 

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

 is no trace whatever of the compound eyes. There 

 are only 3 ])airs of limbs, the so-called nauplius 

 limbs, all belonging to the anterior section of the 

 body, and rejiresenting the 2 pairs of antennae, and 

 the nuindibular legs. The foremost ])air (a') (the 

 1st ]iair of antennæ) are, however, so .'small and 

 rudimentary, that they can easily be overlooked, 

 and have not, indeed, been noticed by Lereboullet. 

 They are in the shape of 2 small, nodiforni protu- 

 Ijeranees one on each side of the front end of the 

 head, and somewhat ventral, each furnished witii a 

 single delicate sensory bristle isee also tig. 5 a\ 

 Tiie 2nd pair of limbs (a '■'l, which ie]>resent the 2nd 

 pair of antennæ, are, on the otlier hand, of very 

 considerable size, forming a pair of ])owertully 

 developed oars, extended laterally, and almost as 

 long as the body. Each of these limbs consists of 

 a thick cylindrical scajjC, and 2 rather une([ually 

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

 margin, the scape has a conical projection, ending 

 in a shoi't. bristle-like point, and at its end, also in 

 the hind margin, a similar projection ending in a 

 rather longer bristle bending backwards. Of the 

 two rami the ui)])cr or foremost one is rather larger 

 than tiie other, being about half the length of 

 the sea])e. It is somewhat swollen in the middle, 

 almost fusiform, and exiiibits a very indistinct arti- 

 I'ulation: it also carries r» jointed, but not as yet 

 ciliated natatory bristles, 3 of which issue from 

 cørres])onding 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 ])oint 3 bristles similar in a])])earance to 

 those on the front rannis. The 3rd ])air of limbs 

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

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

 about the middle of the body, at tlie dividing line 

 between the iiead and the trunk, and, like the 

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

 rally bent rather more backwards. Tiiey each issue 

 from a somewhat thickened, nodiforinly ])rojecting 

 base, which represents tiie still undeveloped bod\ 

 of the mandibles. Each mandibular leg consists of 



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

 largest, and is furni.shed, on the hind margin, with 



