70 Cumacea: 9. Leuconidae, 1. Leucon 



second, the latter two-fifths as long as the former and carrying an apical 

 spine; the exopod is a little longer than the 1^* joint of the endopod. In 

 the d the endopod is rather longer than the peduncle, its 1^* joint equal to 

 the exopod and carrying more numerous spines. Colour whitish, semi- 

 pellucid. L. 9 6 mm, 6 a little less. 



Mediterranean, Spezia, depth 38 — 56 m. 



11. L. heterostylis Calm. 1907 L. (?) h., Caiman in: Tr. zool. Soc. London, 



V. I8i p. yy t. 8 f. 1—5. 



Pseudorostral lobes straight, horizontal, acute, with coarsely quadridentate 

 projection preceding the sinus which leads to the antero-lateral tooth; serration 

 of lower margin behind the tooth begins strongly but soon dies out. Median 

 line of carapace coarsely and irregularly dentate in anterior half, with one 

 little tooth near hind margin following a depression. Antenna 1, 1^* joint 

 longer than 2^^, 2^^ than 3*^, principal flagellum of 3 joints, the last minute, 

 accessory 1-jointed, nearly as long as first 2 joints of principal combined. 

 Antenna 2 with 3 joints, 3 plumose setae on the 1^^. Maxilliped 1 

 with 2 papilliform branchial sacs. Peraeopod 2, 3*^ joint represented by 

 2 portions of a narrow ring. Peduncle of uropods a little longer than exopod 

 but a little shorter than 1^* joint of endopod, which is two and a half times 

 as long as the 2""^ joint, these joints carrying 8 and 4 spines respectively, 

 the apical spine very long. L. 9 3-42 mm, cS unknown. 



Xew Zealand, Akaroa Harbour, depth 11 m. 



12. L. longirostris 0. Sars 1871 L. l, H. O. Sars in: Ufv. Ak. Forh., j;. 28 

 nr. 1 p. 78 | 1871 L. l, Gr. O. Sars in: Svenska Ak. Handl., n. ser. v. 9 nr. 13 p. 42 t. 15 

 f. 75 I 1879 L. l, A. M. Norman in: Ann. nat. Hist., ser. 5 v.3 p. 69 | 1906 L. l, Caiman 

 in: Mt. Stat. Neapel, u 17 p. 414 t. 27 f. 1— 8 | 1908 L. l, Zimraer in: Ergeb. Tiefsee- 

 Exp., V.8 p. 177 I 1912 L. l, Caiman in: P. U. S. Mus., vAl p. 619. 



Q . Pseudorostral lobes more than one-third of total length of carapace, 

 straight, somewhat upturned, acute, with 2 or 3 teeth below leading to a 

 frontal row of 3 or 4, which are separated by a narrow sinus from the 

 strong tooth of the antero-lateral corner; adjoining lower margin serrate for 

 som.e distance. Median carina of carapace carrying about 7 forward-pointing 

 teeth, diminishing in size towards the hind margin, which they do not nearly 

 reach. Side-plate of 4*^ pedigerous segment with a little curved tooth at 

 the hind angle, the 5*^ segment having a pair of forward-curving ventral 

 teeth. Pleon segment 5 long, telsonic segment short, with dorsal depression. 

 Antenna 1, flagellum 3-jointed, its l^^ joint as long as 3*^ joint of peduncle 

 and as the 1-jointed accessory. Peraeopod 1 long, with row of teeth 

 of 2^^^ joint on lower surface. Peduncle of uropods a little shorter than the 

 exopod, which is a little longer than the 1^* joint of the endopod: the latter 

 more than thrice as long as the 2'^'^ joint, with 15 spines on the medial 

 margin, 2^*^ joint with 5 on that margin and a much larger apical one. 

 L. 9 subadult 5*7 mm. 



d. Pseudorostral lobes one-fifth of total length of carapace, level, 

 obliquely truncate with 2 teeth at end of truncation, the margin then retreating 

 to a vertical piece with 2 teeth and a small antero-lateral tooth below. 

 Median carina of carapace in adult without teeth, with 5 in young (5 (Sars). 

 Side-plate of 4^^ pedigerous segment without tooth, 5*^ segment with the 

 ventral pair. Telsonic segment more narrow^ly produced than in the Q . 

 Antenna 1, flagellum 4- jointed, its P* joint in the adult equalled by the 



