Cumacea: 5. Leptocumatidae, 1. Leptocuma 



53 



with exopods in both sexes, all well developed, except those on the 4^^^ pair 

 in the female. Only 3 pairs of pleopods in the male. Endopod of iiropods 

 2-jointed. 



1 genus. 



1. Gen. Leptocuma 0. Sars 



1873 Leptocuma (Sp. un.: L. kinbergii), G. 0. Sars in: Svenska Ak. Handl., n. ser. 

 V. 11 nr. 5 p. 24 | 1878 & 1879 L., G. O. Sars io: Arch. Naturv. Kristian., v.'d p. 465; 

 V.4 p. 12 I 1887 L., G. 0. Sars in: Rep. Voy. Challenger, v. 19 pars 55 p. 6 | 1908 L., 

 Zimmer in: Ergeb. Tiefsee-Exp., r.8 p. 165 | 1912 L., Caiman in: P. U.S.Mus., vAl p. 615. 



General form slender, elongate, diminishing very gradually from cara- 

 pace to pleon. Pseudorostral lobes produced shortly or not at all in front 

 of the semicircular eyelobe. First pedigerous segment exposed only dorsally. 

 Exopod on peraeopod 4 of Q rudimentary. 



2 species. 



Synopsis of species: 

 f Uropods, 2iid joint of endopod more than half as long as 1st 1. L. kinbergii 

 ) Uropods, yuA joint of endopod less than half as long as 1st . 2. L. minus 



1. L. kinbergii 0. Sars 1873 L. k., G. 0. Sars in: Svenska Ak. Handl., n. ser. 

 u 11 nr. 5 p. 24 t. 6 f. 29— 33 | 1893 L.k., T. Stabbing in: Int. sci. Ser., v. 74 p. 304 | 

 1907 L. A;., Caiman in: Tr. zool. Soc. London, v.lSi p. 30 | 1908 L. kinbergi, Zimmer 

 in: Ergeb. Tiefsee-Exp., v.8 p.l65 | 1912 L. kinbergii, Caiman in: P. U. S. Mus., vii p. 616. 



Body so much compressed in front that the whole in dorsal view^ appears 

 almost parallel sided. Pseudorostral lobes little or in maturity not at all 

 advanced in front of eyelobe, apices 

 broadly rounded and separated by 

 a notch from the bluntly rounded 

 antero-lateral advanced corners. 

 Carapace very small, quite smooth, 

 Pedigerous segment 2 infero- 

 laterally stretching over 1^* seg- 

 ment on to the carapace; 3^ 

 segment below overlapping the 

 2""^ and 4*^^. Telsonic segment 

 not much shorter than the pre- 

 ceding segment, both narrower 

 than those which precede. The 

 flattened semicircular eyelobe 

 showing no corneal lenses. An- 

 tenna 1, flagellum 3-jointed, acces- 

 sory minutely 1 -jointed. Peraeo- 

 pod 1, 2°*i joint about equal to 

 rest of limb, 7*^ scarcely half as 



long as 6*^\ Peraeopod 2, 3^^ joint quite short. Exopod of peraeopod 4 

 small, one-jointed, with small setae. Peduncle of uropods nearly but not 

 quite so long as the lamimir rami (or may equal the exopod, Caiman) 

 endopod a little longer than exopod, of which the 1^* joint is not very long, 

 while the 2"'^ begirt with spines and setae is somewhat longer than the first 

 joint of the endopod; the latter joint on medial margin above has a set of 

 5 spines and below a graduated series of 12, the second joint about two- 



Fig. 26. 

 L. kinbergii (9) Sars. 



