Cumacea: 17. Pseudocumatidae, 4. Pterocuma, 5. Stenocuma 147 



one to the other and not much shorter than the peduncle. Colour diversified 

 with reddish brown stellate flecks. L. 9 11 mm, 6 unknown. 



N. utid N. W. (Jaspian-Sea, Sea of Azoy. 



5. Gen. Stenocuma 0. Sars 



1900 Stenocuma, G. 0. Sars, Crust. Norway, v. 3 p. 73. 



Body slender, integument little indurated. Pedigerous segments without 

 dorsal carinae or protuberances. Telson quadrate or semielliptic. Eyelobe 

 semicircular, with or without the three corneal lenses. Rami of uropods 

 subequal, the exopod not at all shorter than the endopod. 



4 species. 



Synopsis of species : 



J Carapace with 2 pairs of longitudinal serrated crests . 1. S. diastyloides 



\ Carapace without serrated crests — 2. 



( Peraeopods 8 — 5 exceptionally stout, pleon exceptionally 



2 J narrow 2. S. tenuicauda 



I Dimensions of peraeopods and pleon not exceptional — 3. 



{Carapace very narrow, pseudorostrum rather short and 

 obtuse 3. S. gracile 

 Carapace not very narrow, pseudorostrum well produced, 

 subacute 4. S. graciloides 



1. S. diastyloides (O. Sars) 1897 Pseudocuma d., G. 0. Sars in: Annuaire 

 Mus. St.-Petersb.. v. 2 p. 279 1. 14 f.l— 8 | 1900 Stenocuma d., G. O. Sars, Crust. Norway, 

 ».3 p. 73. 



Pseudorostrum very prominent, horizontal, subacute, antero-lateral 

 corners quadrate with serrate margin. Carapace with a pair of serrate carinae 

 from ends of eyelobe to about the middle, followed by a pair wider apart, 

 which turn abruptly downwards as they approach the anterior pair. Pedi- 

 gerous segments 2 — 4 broadly expanded laterally, 5**' with hind corners slightly 

 extended backwards. Telson quadrate, rather broader than long, distal margin 

 slightly convex between two acute points. Eyelobe well developed, but showing 

 no pigment or lenses. Antenna 1, 1^* joint slightly curved, stout, as long 

 as 3^, shorter than 2"*^, flagellum very small, S-jointed, Peraeopod 1, 2^^ 

 joint as long as the other joints combined, which is not the case with 2"'^ 

 joint of peraeopod 2. Rami of uropods rather shorter than the peduncle, 

 the 1-jointed endopod having on the medial margin 9 spines and at the 

 apex 2 that are larger but very unequal. L. Q 10 mm, cf unknown. 



South Caspian Sea, depth 53 — 170 m. 



2. S. tenuicauda (0. Sars) 1894 Pseudocuma t., G. O. Sars in: Bull. Ac. St.- 

 Petersb., ser. 4 vA (v. 36) p. 323 t. 9 | 1900 Stenocuma t., G. O. Sars, Crust. Norway, 

 i\3 p. 73. 



Integument very thin, pellucid. Pseudorostrum short, level, truncate, 

 antero-lateral corners blunt, little prominent. Carapace narrow, without 

 carinae. Free pedigerous segments smooth, last 3 laterally expanded and 

 last 2 laterally tumid. Pleon very narrow, not very long, telson small, semi- 

 elliptic. Eye with 3 corneal lenses. Antenna 1, 1^* joint shorter than either 

 of the subequal 2""^ and 3"^ joints. Peraeopod 1, 2"^ joint shorter than the 

 rest combined, 5*^ much longer than either of the subequal 6^^ and 7*^. Peraeo- 

 pod 2, 2"'^ joint much shorter than the rest combined, 6*^ shorter than 4*^, 



10* 



