oo 



skaarne i Kantonic (it;- delvis torsyiicdr mod korte 

 Borstcr. Bag dis.se 7 Par Lemmer sees etidnu 2 I'ar 

 smaa Tværvulster, hvorved disse TjPinmers Aiital er 

 steget til 9 Par. Endini mangier imidlertid ethvert 

 Spor til de "2 sidste I'ar, som forst senei'e anhegges 

 paa samme Maade som de ovrige. iiagkroppen er 

 endmi ganske kort og nleddet. I)eiis Kndelajiper 

 har sondret sig fra Haleenden og lia-rer nu hver ;5 

 l)orsteformige Vedhæng, hvoraf det midterste er hi- 

 tvdplig ^toi're end de 2 o\'rige. 



Fig. 17 fremstiller den forreste i)id af rjegemet 

 hos et lidt senere rjarvestadium, seet nedenfra og 

 noget stærkere forstørret. De sammensatte Øine (o) 

 har tiltaget betydelig i Størrelse og viser sig alle- 

 rede kort stilkede, med Øienglohen \'el udviklet. 

 Iste Par Følere (a') er paa det na'rmeste uforan- 

 drede. 2det Par Folere (a^) .synes forholdsvis min- 

 dre, idet de er hleven staaende ])aa samme Ud\ik- 

 lingstrin, nieih'iis de fleste ovrige Dele er tiltaget i 

 Størrelse. Det samme gjælder ogsaa JMandilnilai-- 

 fødderne (])), som i Forhold til selve Kindbakkernes 

 Cori)us (M) .sj-nes meget redueerede. Overlæben (L) 

 er fremdeles meget stor og fremragende. De 2 Par 

 Kja'ver er allerede tydeligt udA-iklcdt' og forsynede 

 med en Del Borstei'. Alle Branchialføilder er nu 

 anlagte, men de 2 l)agerste Par endiiu kun tilstede 

 som ubetydelige Tva-rvulster. 



T'mler di'U \idere IMxikling sondrer Anhvgget 

 til de 2 bagerste I'ar Brani'hialfodiicr sig fra Kro})s- 

 sidei-ne som tydeligt fremragende Lemmer, Halen 

 stripkker sig i Lanigden og bliver, som det ovrige 

 Legeme, t\-deligt segmenteret, samtidigt med at 

 HalejihuhMue nu're tydeligt afgræiulser sig og faar 

 et større Antal Horster. 2det Par Folere re(luceres 

 mere og mere. men liehcdder dog endnn en 'i'id lang 

 sine Svomnu'liorster og bevæges som hos de yngre 

 Larver. ^landilmlarfødderne svirulei' mere og mere 

 ind og er tilsidst kun tilstede som rudinienta-re Ved- 

 iiæng. Larven, som paa dette Stadium har en Lauigde 

 af omtrent .'> mm, staar nu paa Overgangen til at 

 antage den MiNciide Tilstand. Den er afliihli'1 paa 

 dette rdvilclingstrin Tab. VT, Fig. ;') og I). \'e(l den 

 der])aa følgende Hudskiftning er Larvetilstanden 

 forl)i, idet det sidste Spor af IMandiliuiarfodderne er 

 forsxundet og 2det Par Følere har tabt sin l>et\(l- 

 ning af Lokomotionsoi-ganer. Endnn er der dog piui 

 de sidstna'vnte Lemmer (se Fig. 7 og 8) en tydelig 

 .\dskilbdse nudlem Skaft og (irene. Den \-dri'(iren 

 iMuh-r i en noget bugtet Spids, ])aa hvilken endnn 

 de sidste svage Kester af de oprindelige Svømme- 

 horster sees (Fig. 8); Indergrenen ser ud som et 

 yderst lidet knudeførmigt Fremsjiring, uden enhver 

 Horstebeklædniui;. Lr Ungen bestemt til at Idive 



sides of the liodv, and pi-øjeet perceptibly iu the 

 form of curved lamella^ slighth- indented and 

 with the edges ])artially furnished with bristles. 

 Behind these 7 pairs of limbs, 2 more ])airs of 

 small transverse pronnnences are visible, raising 

 their nundjer to '.' ]>airs. All traee, however, of 

 the last 2 pairs is still absent, and it is only 

 later that they commence in the same way as the 

 others. The hind part ed' the body is still i|uite 

 short and inaiticulated. Its terminal lol)es have 

 be(H)me separated from the caudal end, and now 

 each carry 1-5 setifoiin a])]iendages, the middle oiu' 

 of which is consideiably larger than the other two. 



Fig. 17 represents the anterior part of the body 

 in a somewhat more advanced larval stage, seen 

 from b(dow, and rather strongly magnified. The 

 compound eyes To) have increased considerably in 

 size, and already have short peduncles, while the 

 eye-ball is well-(hn-elo]ied. The 1st pair of antenntp 

 (a') are nearly unchanged. The 2nd paii- of antennae 

 (a-) seem to be compai'atively smaller, having re- 

 nuiined at the same developmental stage, while most 

 of the other jiarts have iiu'reased in size. The same 

 applies to the mandibular legs (p), which, in relation 

 to the body <d' the numdible (M), seem very much 

 reduced in size. The labrum (Ti) is .still very large 

 and ])rojccting. The two pairs cd' maxillæ are al- 

 ready perceiitilily developed, and furnished with a 

 few bristles. All the branchial legs have now ap- 

 |)eared, Imt the hindniost 2 pairs still only as insig- 

 nificant transverse |)rominences. 



During further dev(do]mumt the i-udiijients of 

 the liinihnost 2 pairs of branchial legs separate 

 themselves trom the sides (d' the body as distinctly 

 ])rojecting lindis. The tail is elongated and becomes, 

 like the rest of the body. ]ierceptibly articulated. 

 while, at the same tinu^. the caudal laniellæ are 

 more distinctly deiined. and have ac(|uired a larger 

 number of bristles. The second (lair of antennae be- 

 come more and more reduced, but still for some 

 time retain their natatory bristles, aiul are moved 

 as in the \-(mnger lai'va'. The mandibular legs 

 dwindle more and nmre. and at last oidy ajipeai' as 

 rudinu'utai'x- ajjpeiulages. The larva, which, at this 

 stage, has a length of about o mm, is on the point 

 of entering its ])ernKiiuMit condition. It is thus re- 

 jiresented on PI. VI. rigs. "> and il. With the en- 

 suing exuviation, tin' larval period is past, the last 

 trace of numdibular legs having vanished, ami the 

 2nd ])air (d' antenna' having lost theii- imjiortaiu'c 

 as (U'gans of loconmtion. In the last-named lindis 

 (see tigs. 7 and 8) there is still, however, a distinct 

 I separation between the scape and the rami. The 

 outer ramus ends in a sonu'what curved p(dn(. u]i(pu 

 which the last feeble remains of the original nata- 

 tory bristles are \isible (Hg. S). The muw ramus 

 looks like an extreimdx' small nodifonn jirojection. 



