148 



Cumacea: 17. Pseudocumatidae, 5. Stenociuna, 6. Pseudocuma 



5th^ or 7^^, which are subequal iu length. Peraeopods 3 — 5 abnormally stout, 

 4*^ joint not much shorter than 2"^'^ in the last 2 pairs, 5^^ joint short, oval, 

 fringed with strong simple setae on medial margin. Rami of uropods sub- 

 equal, a little shorter than the peduncle, endopod having on medial margin 

 3 spines in 9, 10 (7 in fig.) in d. Colour whitish. L. 3-5 mm. 



N. W. Caspian Sea. 



3. S. gracile (0. Sars) 1894: Pseudocuma gracilis, G. 0. Sars iu: Bull. Ac. St.- 

 Petersb., ser.4 v. 4 (i'. 36) p. 318 t. 7 | 1900 Stenocuma g., (j. O. Sars in: Crust. Norway, 

 v.S p. 73 I 1907 Pseudocuma g., Lebediew in: Trudui St.-Peterb. Obshch., «. 38i p. 95. 



Integument thin, semi-pellucid. Pseudorostrum short, level, apically 

 somewhat obtuse, antero-lateral corners little prominent. Whole body without 

 carinae. ^^^ and 3^^ pedigerous segments the largest, laterally 

 very broad and laminar, 5*^ with hind corners evenly rounded. 

 Pleon very long and narrow. Telson small, semi-elliptic. Eye 

 with 3 corneal lenses. Antenna 1, joints 1 — 3 subequal in 

 length. Peraeopod 1, 'I^^ joint as long as the rest combined, 

 5*^ much longer than either 6^^ or 7**^. Peraeo- 

 pod 2, 2"*i joint rather shorter than the rest 

 combined, 6*^ shorter than b^^ or 1^^, 1^^ distally 

 armed in (3 with 3 retroverted hooks. Peraeo- 

 pods 3 — 5 slender, 4t^^ joint shorter than 5*^ 

 in the 3*^ and 4*^^ pairs. Rami of uropods sub 

 equal one to the other 

 endopod having medial 

 in Q , ciliated and with 9 spines in (5 . L 



N. W. Caspian Sea. 



4. S. graciloid.es (0. Sars) 1894 Pseudocuma g., G. 0. Sars in: Bull. Ac. St.- 

 Petersb., ser. 4 i'. 4 (u 36) p. 321 t. 8 | 1900 Stenocuma g., G. 0. Sars, Crust. Norway, 

 u3 p. 73 I 1902 Pseudocuma latiaculeata -f- P. gracilloides, S. Zernow in: Annuaire Mus. 

 St.-Petersb., tt6 p. 566, 570 t. 22 f. 21— 24; p. 570, 577 | 1907 P. graciloides, Lebediew 

 in: Trudui St.-Peterb. Obshch., u38i p. 95. 



More strongly built than «S. gracile. Pseudorostrum longer and apically 

 subacute. Branchial regions of carapace more distinctly defined. Peraeopod 2 

 with 7*^ joint decidedly longer than h^"^, 'instead of scarcely equal to it. 

 Uropods with 6 spines on medial margin of endopod in Q, 10 in 6. 

 L. 6 mm. Colour variegated with reddish brown, stellate flecks. Character 

 of spines on which P. latiaculeata was chiefly based is common to many species. 



North Caspian Sea; Sea of Azov. 



Fig. 98. 



S. gracile CSars) 



pleopod 1. 



Fig. 99. 

 , , , , S. gracile (Sars) 



and to the peduncle, pieopod 2. 



margin with 8 spines 



4-5 — 6 mm. Colour uniformly whitish. 



6. Gen. Pseudocuma 0. Sars 



1858 Cyrianassa (Sp. un.: C.longicornis) (uou Bate 1856), Bate in: Kinahan in: 

 Nat. Hist. Rev., n 5 P. p. 203 | 1861 Leucon (non Kroyer 1846), P. J. Beneden in: Mem. 

 Ac. Belgique, v. 33 [nr. 3] p. 85 | 1865 Pseudocuma, G. 0. Sars in: Forh. Selsk. Christian., 

 1864 p. 68 I 1879 P., G. 0. Sars in: Arch. Naturv. Kristian., vA p. 60 | 1893 P., T.Stebbing 

 in: Int. sci. Ser., v. 74 p. 307 | 1894 P. (part.), G. 0. Sars in: Bull. Ac. St.-Petersb., 

 ser.4 u4 (v. 36) p. 298 | 1897 P. (part.), G. O. Sars iu: Annuaire Mus. St.-Petersb., v. 2 

 p. 289 I 1900 P., G. 0. Sars, Crust. Norway, v.S p. 73 | 1909 P., Stappers in: Cellule, 

 V.25 p. 368. 



Pedigerous segments without carinae or protuberances. Telson semi- 

 circular or bluntly semiovate. Eyelobe semicircular or heart shaped with 3 



