Cumacea: 11. Diastylidae, 1. Diastylis 97 



than, twice as long as ?'■''. Peraeopod 2, 5^'^ joint longer than 6*'^ and 7^^ 

 combined. Endopod of uropods in 9 with spines on the 3 joints respectively 

 6, 2, 2. in d 16, 7, 7; terminal spine in 9 continuous with the apical 

 joint. Colour greyish white, in 9 tinged with yellow. L. 9 12 mm, (S 

 14 mm. 



('oast of Norway, Kattegat, British Isles, coast of France, at various depths 

 between 27 and 549 m, but in lat. 55<» 40' N., long. 120 46' W., at 2700 m. 



14. D. laevis Norm. 1869 D. I., A. M. Norman in: Rep, Brit. Ass., i;. 38 p. 270 \ 

 1871 D. tiwiida, G. O. Sars in: Svenska Ak. HandL, u. ser. v. 9 nr. 13 p. 5 I 1877 D. laevis, 

 Meinert in: Natnrh. Tidsskr., ser. 3 w. 11 p. 176 ] 1819 D. I., A.M.Norman in: Ann. nat. 

 Hist., ser. 5 v.3 p. 60 | 1883 D. l, D. rostrata?, G. 0. Sars in: Forh. Selsk. Christian., 

 1882 nr. 18 p. 57, 58 | 1897 D. L, Ehrenbaum in: Wiss. Meeresunters., ». 2i p. 416 | 1900 

 D. rostrata, G. 0. Sars (non Goodsir 1843), Crust. Norway, v. 3 p. 51 t. 39 | 1906 D. laevis, 

 A. M. Norman & T. Scott, Crust. Devon Cornwall, p. 31 | 1909 D. l, A. M. Norman &. G. S. 

 Brady in: Nat. Hist. Tr. Northumb., ser. 2 v.'du p. 32. 



Near to B. tnmidus (nr. 25) and D. rathkii (nr. 16). Pseudorostral 

 lobes well produced, horizontal, ending acutely, antero-lateral corners rounded, 

 serrate. Carapace of 9 smooth, with scattered hairs, in d with smooth longi- 

 tudinal carina on each side, crossed in front by an obliquely transverse fold. 

 Pedigerous segments also smooth, except for serrate front margin of 5*^'^ 

 segment, of which the postero-lateral corners are acute, more produced in 

 d than in 9 . Pleon segments spinulose only in d ; telson nearly equal to 

 the 2 preceding segments combined, its distal portion much the longer, with 

 11 — 17 pairs of lateral spines. Eye well developed. Antenna 1, 3^ joint 

 nearly as long as first, longer than the 2^^. Peraeopod ], 2"'^ joint densely 

 fringed with plumose setae on both margins with spines on surface be- 

 tween them; 5*'^ joint about as much longer than 7^^^ as it is shorter than 

 6^^. Peraeopod 2, ^^^ joint subequal to 6*^ and 7*^ combined; 3^ and 

 4^^ pairs with 2'^^ joint not denticulate. Peduncle of uropods longer than 

 the telson, with as many as 23 spines on the medial margin; exopod 

 longer than endopod, which is about half as long as the peduncle, with 

 7 or 8. 3 or 4, 2 or 3 spines respectively on the medial margin of its 3 

 joints, the 1^* longer than 2"'^ and 3*^ combined. Colour greyish white. 

 L. 10—11 mm. 



S. coast of Norway, Danish, French, British waters, depth 9 — 37 m, and between 

 lat. 52° 25' and 540 15' N. in depths between 165 and 2980 m. 



15. D. sulcatus Calm. 1912 D. sulcata, Caiman in: P. U. S. Mus,, f. 41 p. 605. 

 654 tf. 76—78. 



Near to V. ndhkii (nr. 16), but distinguished by sculpture and more 

 elongate form of the carapace. Pseudorostral lobes horizontal, acute; lower margin 

 of carapace anteriorly serrate; just behind the small eyeless eyelobe a carina, 

 there dentate, crosses the carapace and diverges downwards and backwards, 

 becoming denticulate below but not reaching the hind margin; sideplates of 

 2"<i pedigerous segment narrowly rounded in front, lateral expansions of 3^ 

 and 4.^^ more strongly produced backwards than in IK rathkii, postero-lateral 

 angles of 5**1 acutely produced. Pleon segment 5 slightly longer than the 

 '6^^, telson about V:/^ longer, its distal section long, narrow, with about 7 

 pairs of lateral spinules. Antenna 1, 1^* joint nearly thrice as long as 2°*^, 

 and twice the 3'^. .Joints of antenna 2 short. Peraeopod 1, 2°*^ joint much 



Das Tierreich. 39. Lief. : T. R. R. Stebbing, Cumacea. 7 



