. Cumacea (Sympoda). Cumacea. 64 Cumacea: 9. Leuconidae. 1. Leucon - Antenna 1 with accessory flagellum longer than 1st ) joint of principal. 11. L. heterostylis I Antenna 1 with accessory flagellum not longer than I 1st joint of principal — 13. / Telsonic segment greatly produced between the ) uropods 12. L. longirostris 1 Telsonic segment only moderately produced between I the uropods 13. L. kalluropus / Uropod with 2iid joint of endopod not broader at end I than its apical spine 14. L. pallidas I Uropods with 2iicl joint of endopod broader at end ' than its apical spine •— 15. j Carapace wi

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. Cumacea (Sympoda). Cumacea. 64 Cumacea: 9. Leuconidae. 1. Leucon - Antenna 1 with accessory flagellum longer than 1st ) joint of principal. 11. L. heterostylis I Antenna 1 with accessory flagellum not longer than I 1st joint of principal — 13. / Telsonic segment greatly produced between the ) uropods 12. L. longirostris 1 Telsonic segment only moderately produced between I the uropods 13. L. kalluropus / Uropod with 2iid joint of endopod not broader at end I than its apical spine 14. L. pallidas I Uropods with 2iicl joint of endopod broader at end ' than its apical spine •— 15. j Carapace with median serrations continuous throughout 15. L. serratus 15 -c Carapace with median serrations not continuous ( throughout — 16. j Eyelobe small but distinct 16. L. kerguelensis Eyelobe rudimentary — 17. ( Pseudorostrum horizontal — 18. 17 Pseudorostrum bent upwards — 19. {Frontal lobe with 3 denticles on each side; median serrations not limited to first half of carapace . 17. L. assimilis Frontal lobe without lateral denticles; median ser- rations only on first half of carapace 18. L. acutirostris i Uropods with exopod only a little longer than the 19 { peduncle 19. L. sagitta I Uropods with exopod much longer than the peduncle 20. L. vanhoefFeni 1. L. siphonatus Calm. 1905 L. s., Caiman in: Sci. Invest. Fish. Ireland, 1904 app. 1 p. 19 t. 1 f. 2—4 1 1906 L. s., Caiman in: Mt. Stat. Neapel, v. 17 p.416 t. 27 f. 9 I 1908 L. s., Zimmer in: Ergeb. Tiefsee-Exp., v. 8 p. 177. Pseudorostral lobes well advanced, slightly upturned, apically rounded, with teeth on the dorsal and apical margins in the 9 only, the border between. Fig. 33. L. siphonatus Caiman (? juv.). the apex and the antero-lateral tooth having 2 emarginations separated by a serrate prominence and introduced by a strong subapical tooth; the lower border behind the antero-lateral tooth serrate. In the 9 the frontal lobe has one or two teeth at its apex. Anteriorly the sides of the carapace are spri