Aora 587 



2. Gen. Aora Kr0yer 



1845 Aora (Sp. un.: A. typica), Kreyer in: Naturli. Tidsskr.. ser. 2 v.l p. 328, 

 335 1 1888 A., T. Stebbing in : Rep. Voy. Challenger, v. 29 p. 1072 (synonymy to date) [ 

 1893 A., A. DellaValle in: F. Fl. Neapel, i\20 p.406 | 1894 A., G. 0. Sars, Crust. 

 Norway, v.l p. 544 | 1849 Lalaria (Sp. un.: L. longitarsis), H. Nicolet in: Gay, Hist. 

 Chile, v.S p. 240 | 1856 Lonchomerus (nom. nud.), Bäte in: Eep. Brit. Ass., Meet. 25 

 p. 58 I 1857 L. (Sp. un.: L. graeilis), Bäte in: Ann. nat. Hist., ser. 2 v. 19 p. 143 | 1857 

 Lalasia, Bäte in: Ann. nat. Hist., ser. 2 u20 p.525 | 1859 Autonoe (part.), R. M. Bruzelius 

 in: Svenska Ak. Handl., n. ser. v.S nr. 1 p. 23. 



Body sleuder. Head, lateral lobes obtuse. Side-plates of medium depth, 

 in ö 1^* somewhat produced forward, 2*^ rather larger than 3"^, 5*^ less deep 

 than 4*^. Antenna 1 much the longer, flagellum long, accessory flagellum 

 well developed. Lower lip with mandibular processes strongly produced. 

 Maudible, both cutting plates dentate, spine-row of 3 or 4 spines, molar strong. 

 Maxiila 1, inner plate small, with 1 apical seta, 2'^ Joint of palp with several 

 spine-teeth. Maxiila 2, inner plate the smaller, its inner margin fringed. Maxilli- 

 peds, inner and outer plates well developed, well armed, finger of palp not 

 stout. Gnathopod 1 in d (Fig. 101) elongate, slender, 4**^ Joint produced 

 into a very long spine-like process behind the 5^^, which is a little broader 

 and longer than the narrowly oblong G^^, finger much overlapping palm. 

 Gnathopod 1 in Q , 4*^ Joint not produced, ö*** much shorter than 6**^. Gnatho- 

 pod 2 in c5 and 9, 5*^ and 6*^ joints subequal. Peraeopods 3—5, 2* Joint 

 not very widely expanded, 4*^ peraeopod longer than 3*^, b^^ than 4*^. Marsupial 

 plates large, broad. Uropod 3, rami equal, much longer than peduncle. 



1 species. 



1. A. typica Kreyer 1845 A. t., Kreyer in: Naturh. Tidsskr., ser. 2 a 1 p. 328 t. 3 

 f. 3a — 1 I 1849 Lalaria longitarsis, H. Nicolet in: Gay, Hist. Chile, ».3 p. 243; Crust. t. 2 

 f. 8, 8a — f I 1857 Lonchomerus graeilis, Bäte in: Ann. nat. Hist., ser. 2 f. 19 p. 143 | 1862 

 Aora g. + A. typica, Bäte, Cat. Amphip. Brit. Mus., p. 160 t. 29 f. 7; p. 161 1. 29 f. 8 1 1885 A. t, 

 Chilton in: Ann. nat. Hist., ser. 5 v.lS p.370 j 1893 A. g. + A.t, A. DellaValle in: F.Fl.Neapel, 

 «7.20 p.407 t.2 f. 9, t. 12 f. 25— 39, t.56 f. 37; p. 409 t. 56 f. 38—40 | 1894 A.g., G. 0. Sars, 

 Crust. Norway, ?'. 1 p. 545 t. 193 j 1859 Atitonoe punctata, R. M. Bruzelius in: Svenska Ak. 

 Handl., n. ser. v. 3 nr. 1 p. 24 1. 1 f . 3 a— g { 1879 Microdeutopus maculatus ( ? ), G. M. Thomson 

 in: Ann. nat. Hist., ser. 5 v. 4 p. 331 t. 16 f. 5—8 | 1881 Microdentopus m., G. '^[. Thomson 

 in: Tr.N. Zealand Inst., ul3 p. 217 t.8 f. 7a-c j 1882 M. m. (d), Chilton in: Tr. N. Zea- 

 landlnst., v. 14 p. 173 t. 8 f. 3a, b | 1879 Microdeuteropus tenuipes {^)-\-M. mortoni (c5), 

 Haswell in: P. Linn. Soc. N. S. Wales, vA p. 339 t. 22 f. 1, 2 | 1882 Microdeutopus t. -\- 

 M. m., Haswell, Cat. Austral. Crust., p. 264 | 1888 Aora 

 kergueleni -\- A.trichobostrychus, T. Stebbing in: Rep. *' ^° 



Voy. Challenger, v. 29 p. 1073 t. 109, LA (S, i.D i; ^^-^1--=^ 



p. 1078 1. 109 f. B d, f. C $ . . /^C^^^^^J^ 



Pleon Segment 3, postero-lateral corners / ^ / \/j''i^ 

 obtusely quadrate. Eyes small, oval, dark. / W j/i 

 Antenna 1 '^j.^ as long as body, 2'^ Joint the longest, , / j^ 



3—4 times as long as 3^, flagellum with 20—30 l iXJ j *" ^°'''* 



joints or more, accessory flagellum 5-jointed. VCTZv 



Antenna 2 much shorter, ultimate Joint of peduncle ""^""^ 



rather longer than penultimate or than flagellum, ^'^- Qnat^pK"*' ^' 



flagellum 7-jointed. The gnathopod 1 in d 



(Fig. 101) affords the principal generic character, but the 2^ Joint in adult ä 



(typica) is said to have a triangulär process on the front margin, not observed in 



any of the other forms; in A.trichobostrydms the bind margin of the 2^ Joint 



