146 Cumacea: 17. Pseudocumatidae, 4. Pterocuma 



space separating the carinae of one side from those on the other. Pedige- 

 rous segments longitudinally carinate, the keel successively encreasing. that 

 of the last segment the most prominent, triangular. Pleon smooth, telsou 

 small, broader than long, quadrangular, hind angles rounded off. Eye, 2 patches 

 of pigment in triangular eyelobe. Uropods short and stout, peduncle sub- 

 equal to the subequal rami, endopod with 1 spinule below the middle of the 

 serrulate medial margin. Many reddish brown stellate flecks. L. q 8 mm^ 

 (S unknown. 



North and South Caspian Sea. 



2, P. peetinatum (Sowinsky) 1892 Pseudocuma pectinata, Sowinsky in : Mem. Soc. 

 Kiew, V. 11 p. 113 I 1894 P.p., G.O.Sars in: Bull. Ac. St.-Petersb., ser. 4 v. 4 (v. 36) p. 299^ 

 t. 1, 2 I 1897 P.p., G. 0. Sars in: Aunuaire Mus. St.-Petersb., u2 p. 288 | 1899 P. p., 

 Sowinsky in: Bull. Ac. St.-Petersb., ser. 5 v. 8 p. 376 | 1900 Pterocuma p., G. 0. Sars^ 

 Crust. Norway, v. 3 p. 73 | 1901 Pseudocuma p., S. Zernow in: Annuaire Mus. St.-Petersb., 

 V.6 p. 666, 573 t. 22 f. 19, 20 | 1907 P.p., Lebediew in: Trudui St.-Peterb. Obshch., 

 v.38i p. 95. 



Body rather stout, integument squamose. Pseudorostrum short, slightly 

 upturned, subacute, the antero-lateral corners broadly triangular. Carapace 

 smooth, the branchial regions tumid, gibbous behind in 9 . Of the pedige- 

 rous segments the 2""^ has a pair of submedian dorsal processes and the 

 side-plates much extended forwards in a rounded lobe, the S'^has a single 

 medio-dorsal process not large, the long 4th and 5*^ having each a large, 

 laminar, linguiform, erect, median process. The 5*^^ segment has the postero- 

 lateral corners a little obtusely extended, and in the d fringed with plumose 

 setae. The first 5 pleon segments have a pair of longitudinal carinae. dis- 

 tally raised and rounded; each segment also having the hind border raised,^ 

 and emarginate on both dorsal and ventral faces, while the sides project at 

 an obtuse angle. Telson very small, rather broader than long, quadrangular. 

 Eye with 3 corneal lenses in a rounded eye-lobe. Antenna 1, 1st and 2°^ 

 joints subequal in length, 3*^ shorter, flagellum 3-jointed, accessory minutely 

 1-jointed. Uropods long and slender, rami considerably shorter than peduncle, 

 endopod rather longer than exopod, with serrulate medial margin, proximal 

 half of which in d is densely fringed with spinules. Colour varied with 

 reddish brown arborescent patches. L. 9 8, d 8*5 mm. 



Black Sea (Sea of Azov); N. Caspian Sea. 



3. P. sowinskyi (0. Sars) 1894 Pseudocuma s., G. 0. Sars in: Bull. Ac. St.- 

 Petersb., ser. 4 V.4: (a 36) p. 312 t. 3 | 1900 Pterocuma s., G. O. Sars, Crust. Norway, v.^ 

 p. 78 I 1901 Pseudocuma s., S. Zernow in: Annuaire Mus. St.-Petersb., v.G p. 566 | 1907 

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



Pseudorostrum short, slightly upturned, subtruncate, antero-lateral corners 

 much produced, with concave front margin coarsely serrate. Carapace with 

 a pair of sinuous carinae from tips of pseudorostrum embracing the whole 

 frontal region and then with strong curve forming serrate submedian boundaries 

 to the tumid branchial regions. A median carina is figured along the proxi- 

 mal half of the carapace. All the pedigerous segments with medio-dorsal 

 carina, rather low and rounded on the first 3, higher and laminar on 4*'^ 

 and b^^, on the b^^ triangular, the carinal edges coarsely serrated. Pleon 

 segments smooth. Telson transversely quadrangular, much broader than long. 

 Eyelobe rounded triangular, the middle corneal lens quite inconspicuous. 

 Antenna 1 as in P. pectinatwn. Uropods rather short and stout, rami subequal 



