150 Cumacea: 17. Pseudocumatidae, 6. Pseudocuma 



3. P. longicorne (Bate) 1858 Cyrianassa longicornis (J.V. Thompson MS. sp.), 

 Bate in: Kinahan in: Nat. Hist. Rev., v. 5 p. 204 | 1858 C. I, Bate in: J. R. Dublin See, 

 V.2 p. 101 tf. s I 1861 Leucon cercaria, P. J. Beneden in: Mem. Ac. Belgique, v. 33 [nr. 3] 

 p. 85 t. 14 I 1865 Pseudocuma bistriata, G. 0. Sars in: Forh. Selsk. Christian., 1864 

 p. 70 I 1877 Cumabella, Meinert in: Naturh. Tidsskr., ser. 3 ull p. 179 | 1879 Pseudocuma 

 cercaria, Gr. O. Sars in: Arch. Naturv. Kristian., u4 p. 62 t. 40 — 42 | 1880 Cuma c, 

 Meinert in: Naturh. Tidsskr., ser. 3 v. 12 p. 497 | 1893 Pseudocuma longicornis, T. Stebbing 

 in: Int. sci. Ser., n 74 p. 307 | 1895 P. l, H.J.Hansen in: Brgeb. Plankton-Exp., u2 

 G. c. p. .59 I 1900 P. cercaria, G. 0. Sars, Crust. Norway, v. 3 p. 74, 108 t. 51, 52 | 1900 

 P. longicornis, Zimmer in: Fauna arctica, v.l p. 428 (wilh additional syn.) | 1905 P. Z.. 

 Caiman in: Sci. Invest. Fish. Ireland, 1904 app. 1 p. 36 | 1906 P. I., Gilson in: Mem. 

 Soc. ent. Belgique, v. 12 p. 78 tf. 1—3, 6,8—11, 13, 14 | 1906 P. l, A. M. Norman & 

 T. Scott, Crust. Devon Cornwall, p. 32 | 1909 P. L, Stappers in: Cellule, ^;. 25 p. 368 i 

 1909 P. I., A. M. Norman & G. S. Brady in: Nat. Hist. Tr. Northumb., ser. 2 v. 3ii p. 33. 



Body rather slender, especially iu d. Pseudorostrum prominent, acute, 

 in Q more than in d. Antero-lateral corners unarmed. Carapace sculptured 

 with 2 pairs of oblique folds from the antero-lateral corners, one curving 

 close to the hind margin, the other in advance of it; free edges of cara- 

 pace quite smooth. Pedigerous segments smooth. Pleon slender, telson nearly 

 semicircular and slightly serrate in 9 , fully as long as broad at the base 

 and smooth-edged in d. Eyelobe somewhat heart shaped with the 3 corneal 

 lenses larger and more distinct in d than in 9 . Antenna 1, 3*^ joint shorter 

 than I®* but longer than 2""^, at least in the Q, flagellum 3-jointed in 9, 

 4-jointed in c?. Antenna 2, the long flagellum in the d variable in its 

 length. Peraeopod 1. 2"<i joint about equal in length to rest of the limb, 

 slender 5*^ joint much longer than G*^, 6*^' than 1^'^\ Peraeopod 2, 7*'^ joint 

 as long as b^^ in 9 , but shorter in d and tipped with a single hook (Sars), 

 2 apical and 1 subapical (Gilson). The rudimentary exopods of the 3<^ and 

 4'^'^ peraeopods in the 9 are small, but distinctly 2-jointed, 2"^' joint longer 

 than 1^*. Pleopod 1 of d with 4 strong setae distally on medial margin 

 of basal joint; pleopod 2 with 2 spines distally on lateral margin of that 

 joint. Pedimcle of uropods equal to exopod in 9, shorter in d, endopod 

 much longer, with 10 spines on medial margin in 9, 14 in d*; apical spine 

 of exopod very elongate; relative dimensions of peduncle and rami variable 

 (Gilson). Colour pale, variegated Avith dark brown stellate flecks. L. about 

 4 mm. Gilson describes a form of the d, in which the 2"*^ antenna is short, 

 and the 2'^*^ peraeopod has only 2 hooks at the distal end. 



From N. coast of Norway round coasts of Europe to Sicily; depth, surface to 68 m. 



4. P. ciliatum 0. Sars 1879 P. ciliata, G. 0. Sars in: Arch. Naturv. Kristian., 

 vA p. 71 t.43 I 1893 P. ciliatus, T. Stebbing in: Int. sci. Ser., r.74 p. 307 | 1900 P. ciliata, 

 G. 0. Sars, Crust. Norway, v. 3 p. 74. 



Near to F. longicorne, but more robust, pseudorostrum shorter, apically 

 blunt; antero-lateral corners more produced, almost quadrate; sculpture of 

 carapace the same, but somewhat sharper; 2"<^ pedigerous segment with 

 broader side-plate; integument of pleon with a peculiar irregular reticulate 

 structure; telson almost rectangular, broader than long, distal margin tend- 

 ing to truncate, Eyelobe and eye and mouth-organs as in P. longicorne; 

 antenna 1 short and stout, 3^ joint shorter than 2^^, 2>^<^ than 1 ^*. Peraeopod 

 1, S*'! and G*!^ joints not slender. Rudimentary exopod of 3'^ and 4**1 pe- 

 raeopods indistinctly 2-jointed. Peduncle of uropod shorter than the exopod, 

 which is not very much shorter than the endopod ; the latter carrying only 2 

 spinules near the apex but the whole medial margin closely ciliated; apical 



