Cumacea: 17. Pseudocumatidae, 2. Schizorhyachus, 3. Caspiocuma, 4. Pterocuma 145 



2'^'^ joint distally expanded, carrying above a dense row of upturned setae. 

 Uropods with peduncle considerably shorter than the subequal rami, endopod 

 with serrate medial margin. L. Q 3 mm. d unknown. 



North Caspian Sea. 



3. Gen. Caspiocuma 0. Sars 



1000 Caspiocuma, G. 0. Sars, Crust, Norway, v. 3 p. 73. 



Integument indurated. Carapace without carinae, its branchial regions 

 greatly inflated. First pedigerous segment narrow and inconspicuous, the 

 rest sloping steeply to the pleon, which is short, depressed, the segments 

 on each side expanding into a shelf-like carina. Eye inconspicuous or ab- 

 sent. Peduncle of uropods very short. Appendages in general not known 

 to differ from those of Pseudocuma. 



1 species. 



1. C. campylaspoides (0. Sars) 1897 Pseiidocuiua c, G. 0. Sars in: Annuaire 

 Mus. St.-Petersb., v.2 p. 286 1. 15 f. 1—3 | 1900 Caspiocuma c, G. 0. Sars, Crust. Norway, 

 *■. 3 p. 73 I 1907 Pseudocuma c, Lebediew in: Trudui St.-Peterb. Obshch., «;. 38i p. 95. 



Body short and compact, integument hard and thickly incrusted, with 

 general aspect as in Campi/laspis. Pseudorostrum short, apically blunt, antero- 

 lateral corners inconspicuous, obtusely rounded off. Front part of carapace in 

 dorsal view much narrower than the broad branchial region. Telson semioval, 

 narrowly rounded at apex. The minute eyelobe showing no trace of pigment 

 or corneal lenses. Uropods short and stout, peduncle not much longer than 

 broad, shorter than exopod, which is shorter than the endopod, about in 

 proportions of 2 : 3 : 4. L. Q 3 mm, d unknown. 



South Caspian Sea, probable depth 75 m. 



4. Gen. Pterocuma 0. Sars 



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



Pedigerous segments some or all with dorsal protuberances. Telson 

 quadrate, broader than long. Eyelobe triangular or rounded; of the 3 corneal 

 lenses the central one or all three may be evanescent in the female. Rami 

 of uropods subequal. 



3 species. . • 



Synopsis of species: 



I Pseudorostral lobes very prominent, acuminate 1. P. rostratum 



\ Pseudorostral lobes rather short, not acuminate — 2. 



) Second pedigerous segment with a pair of submedian processes 2. P. pectinatum 



\ Second pedigerous segment with a single median process . 3. P. so'winskyi 



1. P. rostratum (0. Sars) 1894 Pseudocuma rostrata, G. O. Sars in: Bull. Ac. St.- 

 Petersb., ser. 4 vA («. 36) p. 313 t.4 | 1900 Pterocuma r., G. O. Sars, Crust. Norway, v. 3 

 p. 73 I 1907 Pseudocuma r., Lebediew in: Trudui St.-Peterb. Obshch., ?;. 38i p. 95. 



Body rather stout. Pseudorostrum prominent, acuminate, antero-lateral 

 corners nearly quadrate, serrulate in front. Branchial regions of carapace 

 bounded by an upper and a lower pair of oblique carinae and traversed 

 midway between these by a third pair, an intervening wedge-shaped dorsal 



Das Tierreich. 39. Lief.: T. R. R. Stebbing, Cumacea. lO 



