19 



længere nedad delvis dækker dettes Sidefløie. Den nedre 

 Del er forti] afrnndet, men bagtil uddraget i en skarp lige 

 nedadrettet Spids. Epimererne paa 2det Segment er be- 

 tydelig bredere og dækker en Del saavel af Iste som 3die 

 Segment. De er i Enden bredt afrundede og her bevæb- 

 nede med 2 tandformige Fremspring. 3die og 4de Segments 

 Epimerer er atter noget smalere og ligeledes 2tandet. 5te 

 Segments Epimerer er noget bagudrettede og i Kanten be- 

 væbnede med 4 Tænder. Sidste Segment er betydelig sma- 

 lere end de øvrige og uden tydelige Epimerer. men nedentil 

 paa hver Side forsynet med en tydeligt markeret Længde- 

 kjol, der i Forbindelse, med de 2 dorsale Kjøler giver dette 

 Segment et næsten qvadratisk Gjennemsnit. Dets bagre 

 Kant gaar oventil nd i 2 lange dolkformige Spidser, der 

 ligesom omfatter Roden af det midterste Halevedhæng. og 

 enhver af de ventrale Kjoler ender ligeledes med et tem- 

 melig stærkt tandformigt Fremspring. 



Paa Bugsiden ai' de 5 forreste Segmenter tindes mel- 

 lem Roden af Svømmevedhængene en hoi sammentrykt Torn. 



Øinene (Fig. 3) er forholdsvis megel smaa. med korte 

 og tykke Stilke. Den facetterede Del. der viser et mørkt, 

 brunsort Pigment, er ikke som sædvanlig fortykket, men 

 tvertimod af ringere Diameter end selve Øienstilken ved 

 Roden. Den da-kkes oventil for en Del af en tilspidset 

 med nogle korte Børster besat Fortsats. 



Iste Par Folere (Fig. 4) er kun lidet udviklede. 

 neppe mere end halvt saa lange som Rygskjoldet, og be- 

 staar som sædvanlig af et 31eddet Skaft og 2 mangeleddede 

 Svøber. Skaftets Iste Led er næsten dobbelt saa langt 

 som de 2 øvrige tilsammen og gaar ved Roden paa den 

 ydre Side ml i en bred. næsten hjerteformig Fortsats. der 

 er udtrukket i en skarp, noget udadbøiet Spids. Fort- 

 satsen omslutter, som hos andre Maerurer, en temmelig 

 rummelig Hule (Horecavitet). som aalmer sig udåd med en 

 trang spaltformig Aahning paa den nedre Side ; den er i 

 Kanterne fint cilieret og desuden paa den ovre Side nær 

 den ydre Rand forsynet med o — li lange sabelformige Torner. 

 Den ydre Del af Leddet er evlindrisk og i hegge Kanter, 

 men især den indre, tæt besat med tynde. fint cilerede 

 Børster. Paa den nedre Side rindes nær den indre Kant 

 og omtrent i Midten af Leddets Længde et lidet fortilrettet 

 tornformigt Fremspring, hvorfra en Kjøl strækker sig bagtil. 

 Skaftets sidste Led er finske kort. neppe mere end halvt 

 saa langt som 2det og i Enden skraat afskaaret: hegge 

 Led i Kanterne børstebesatte. 



Svøberne forholder sig noget ulige hos begge Kjon. 

 Hos Hunnerne (Fig. 4j er de neppe længere end Skaftet 

 og indbyrdes omtrent af ens Længde. Den ydre Svobe. 

 der ved et meget bevægeligt. kort og tykt. næsten skaal- 



carapax. whereas, farther down. they partially overlap the 



lateral lohes of tliat part. The lower division is rounded 

 anteriorly. Imt posteriorly produced into a sharp point 

 directed straight dbwnward. The epimera on the 2nd 

 segment are considerabh broader and partially overlap both 

 the Ist and 3rd segments. At the extremity they are broadly 

 rounded. exhihiting here 2 dentiform projections. The epimera 

 of the ord and 4th segments are again much narrower and. 

 also bidentate. The epimera of the . r >th segment are some- 

 what posteriorly directed and furnished along the margin 

 with 4 teeth. The last segment is much more slender than 

 the others and without any true epimera. butbelow, on each 

 side. provided with a distinctly marked longitudinal carina. 

 which, in conjunction with the 2 dorsal carinæ. gives to 

 the transverse section of this segment an almost quadrate 

 appearanoe. Its posterior margin projects above with 2 

 long dagger-shaped points, that embrace, as it were, the 

 base of the telson. and each of the ventral carina' ter- 

 minates likewise in a comparatively strong dentiform projec- 

 tion. 



On the ventral surface of the 5 anterior segments. 

 occurs between the bases of the pleopods a high. compressed 

 spine. 



The eves (fig. 3 ) are comparatively very small, with 

 short and thick pedicles. The cornea. which exhihits a dark, 

 brownish- black pigment, is not, as commonly the case, 

 dilated, hut. on the otlier hand. smaller in diameter than the 

 pedicle of the eve itself at the root. It is covered above. 

 partially, by an acutely pointed projection. beset with shoi't 

 bristles. 



The Ist pair of antennæ (fig. 4| are hut slightly 

 developed, heing scarcely more than half as long as the 

 carapax. and consist as usual of a triarticulate peduncle 

 and 2 multi-articulate flagella. The Ist joint of the peduncle 

 attains almost twice the length of the other 2 tåken together. 

 and at the outer side is seen projecting from its base a 

 broad, almost cordiform process. which is produced into a 

 sharp, soinewhat outwardly bent point. The projection en- 

 closes. as in other Macrura, a ratlier spacious chamber 

 (auditory cavity), which opens exteriorly with a narrow. 

 nssure-shaped oritice on tlie lower side; along the margins 

 it is finely ciliated. and on the upper side. in proximity 

 to the outer margin, furnished besides with 5 or 6 ensiform 

 spines. The terminal portion of the joint is cylindrical, 

 and on both sides. Imt more especially the inner. closely 

 beset with slender. finely ciliated bristles. On the lower 

 side. near the inner margin, and about in the middle of 

 the longitudinal diameter of the segment, occurs a small, 

 anteriorly directed. spiniform projection. from which a short 

 keel extends posteriorly. The last joint of the peduncle 

 is very short. scarcely more than half the length of the 

 2nd. and the extremity obliquely triincate: both articula- 

 tious furnished with bristles along the margins. 



The flagella are somewhat different in the two sexes. 

 The females (fig. 4) have thein scarcelj longer than the 

 peduncle and well-nigh uniform in Length. The outer flag- 

 ellum. connected with the peduncle hy an extremely mobile, 



3* 



