101 



den øvrige Krop. Hovedet er temmelig tykt, lige- 

 som opsvulmet i sit dorsale Parti, og stumpt 

 afkuttet fertil, iiden Spor af noget Rostrum. Det 

 forlænger sig bagtil paa Undersiden i en meget 

 volnminos Plade, der livælver sig ud over Bugsiden 

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

 sats. Denne Plade er den enormt i;dviklede Over- 

 læbe (labrnm). I det indre af Hovedet lielt fortil 

 bemærkes i Midten en meget ioinefaldende blodrod 

 Pigraentmasse af noget uregelmæssig Form ; det 

 enkle Øie. Af de sammensatte Øine er der derimod 

 intetsomhelst Spor at se. Af Lemmer findes ki;n 

 3 Par, de saakaldte Naupliiis-Lemmer, alle tilhørende 

 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 kar Formen af 

 2 ubetydelige knudeformige Fremspring til liver Side 

 af den forreste Ende af Hovedet og noget ventralt, 

 liver 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 Størrelse, forestillende et Par kraftigt ud- 

 viklede, til Siderne udstrakte Aarer næsten af hele 

 Legemets Længde. Enhver af disse Lemmer bestaar 

 af et tykt cjdindriskt Skaft og 2 noget ulige nd- 

 viklede Endegrene. Skaftet har ved Basis i Bag- 

 kanten en konisk Fortsats, der ender med en kort 

 børsteformig Spids, og ved dets Ende lindes, lige- 

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

 gere bagudkrummet Børste endende Fortsats. Af 

 drenene er den øvre eller forreste noget større end 

 den anden og omtrent af Skaftets halve Længde. 

 Den er noget opsvulmet paa Midten, næsten ten- 

 forniig, og viser en meget utydelig Leddeling, samt 

 liærer 5 leddede, men endnu milierede Svonime- 

 borster, hvoraf de 3 udgaar fra tilsvarende Afsatser 

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

 Den bagre Gren er simpelt cylindrisk og delt i 



2 utydeligt sondrede Led, hvoraf det yderste har 

 ved Spidsen 3 Børster af et lignende Udseende som 

 de paa den forreste Gren. Det 3die Par Lemmer 

 (Mp), de saakaldte Mandilnilarfodder, hvoraf intet 

 Spor findes hos det voxne Dyr, udgaar omtrent fra 

 Midten af Legemet, paa Grændsen niellem Hoved og 

 Krop, og er ligesom 2det Par udstrakte til hver 

 Side, skjøndt sædvanlig noget mere bagudbøiede. 

 De udspringer hver fra en noget fortykket, knude- 

 formigt fremspringende Basis, som forestiller det 

 endnu uudviklede Corpus af Kindbakkerne. Hver 

 Mandibularfod bestaar af 3 utydeligt sondrede Led, 

 hvoraf det Iste er størst og forsynet i Bagkanten 

 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 Lemmer og af aflang oval Form, 



remainder of the body. The head is rather thick 

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

 bluntly truncated in front, without any trace of a 

 i-ostrum. It is produced po.steriorly on the inferior 

 side to a very voluminous plate, which arches over 

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

 conical projection. This plate is the enormously 

 developed upper liji (labrum). Inside tlie head, in 

 the middle right in front, a rather irregularly- 

 shaped, very conspicuous mass of blood-red pigment 

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

 is no trace whatever of the compound 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, been noticed by Lereboullet. 

 They 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, on 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 limbs consists of 

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

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

 margin, the scape has a conical projection, ending 

 in a short, 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 upper or foremost one is rather larger 

 than the other, being about half the length of 

 the scape. It is somewhat swollen in the middle, 

 almost fusiform, and exhibits a very indistinct arti- 

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

 ciliated 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 body, at the dividing line 

 between the head and the trunk, and, like the 

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

 rally bent rather more backwards. They each issue 

 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 



