(^umacea: 11. Diastylidae, l.Diastylis 101 



serrate anteriorly, hind margin raised. Pedigerous segments all free, 1, '2, 

 and 5 with crenulate front margin, postero-lateral corners of the 5^^ bluntly 

 rounded. Pleon segments 1 — 6 without denticles, with short hairs, telson 

 narrow, twice as long as the 6*^ segment, with 10 or 11 pairs of lateral 

 spinules. Eyelobe very small, eye wanting. Antenna 1 with elongate peduncle. 

 Peraeopod 1, 2"^^ joint not as long as rest of limb, last 3 joints subequal. 

 Peraeopod 2, 7^^ joint longer than 6^^, 5*'' subequal to both combined. 

 Peduncle of uropod very little longer than the telson, less than twice the 

 exopod, rather more than twice the endopod, of which the P* joint equals 

 the 2"*^ and 3*^ combined, with 5 or 6, 2 or 3, 3 spines on the medial margin of 

 the joints respectively. L. 9 8 — 12 mm, d 12 mm (Ohlin. who unites Jk 

 sfi/gins with this species). 



Lat. 600 31' X., long. 9^ 18 W., depth 419 lu; NW. of Spitzbergen, depth 1789 m; 

 cold area betweeu Iceland and N. Norway, depth. 2510 m. 



21. D. lucifer (Kroyer) 1841 Cuma lucifera, Kroyer in: Naturh. Tidsskr., v.'dvi 

 p. 527, 531 t. ti f. 34, 35 | 1846 C. l, Kroyer in : Naturh. Tidsskr., ser. 2 w. 2ii p. 171, 2(J7 [ 

 1849 C. I., Kroyer in: Voy. Nord Crust., t. 3a — k ] 1859 Diastylis I., Danielssen in: Norske 

 Selsk. Skr. 19. Aarh.. vAn p. 108 | 1865 D. borealis, Bate in: Ann. uat. Hist., ser. 3 

 V. 15 p. 85 t. 1 f. 3 I 1871 D. lueifera, G. O. Sars in: Svenska Ak. Handl., n. ser. v.9 iir. 13 

 p. 5 I 1879 D. luciferus, 8. L Smith in: Tr. Connect. Ac, v. 01 p. 112 | 1894 D. lucifer, 

 A. M. Norman in: Ann. nat. Hist., ser. 6 v. 13 p. 276 | 1900 D. lueifera, G. 0. Sars, (.rust. 

 Norway, v.S p. 49 t. 38 | 1900 D. l, Zimmer in: Fauna arctica, v. 1 p. 422 (with synonymy), 

 434 I 1906 D.I., A. M. Norman & T. Scott. Crust. Devon Cornwall, p. 32 | 1909 I>. i., 

 A. M. Norman & (y. S. Brady in: Nat. Hist. Tr. Northumb., ser. 2 v.'dn p. 32 | 1912 

 D. l, Caiman in: P. U. S. Mus., «.41 p. 605, 662. 



Pseudorostral lobes conical, horizontal, antero- lateral corners almost 

 obsolete: carapace of Q with denticles in transverse rows on the frontal lobe 

 and less densely to the rear, in the d only 3 denticles, 2 flanking the frontal 

 lobe, 1 as in the 9 on the eyelobe. Pedigerous segment 5 with postero- 

 lateral angles acutely produced only in the d. Pleon segments 1 — 6 unarmed, 

 telson in Q twice as long as the 6^^ segment with 3 or 4 pairs of lateral 

 spines, longer and narrower in the d. Eye small but distinct. Antenna 1, 

 3d joint a little shorter than P*, longer than 2'^'^. Peraeopod 1, 2"*^ joint 

 not as long as rest of limb, last 3 joints subequal. Peraeopod 2, o^^ joint 

 little longer than 7*'', which is decidedly longer than 6^^. 3*^ and 4^*^ pairs 

 with 2"*^ joint not denticulate, without exopods in 9 . Peduncle of uropods 

 longer than the rami, exopod shorter than telson in 9, subequal to it in d, 

 in both sexes longer than the endopod, of which the P'^ joint is not much 

 longer than the 2"*^, spines on medial margin of its joints respectively 3, 2, 

 2 in 9, y, 7, 6 in d. Colour greyish white with olive tinge in 9. whitish 

 semipellucid in d. L. scarcely 6 mm 9, 8 mm d. 



Coasts of N.Europe, Atlantic coast of N.America S. of Labrador; depths irum 

 15—388 m. 



22. D. rugosoides A.Walker 1896 £>. r., A.O.Walker in: Rep. Brit. Ass., 

 i\ 66 p. 459, and in: Herdman in: P. Liverp. biol. Soc, i;. 10 Tr. p. 45. 



Very near D. mgo.'^ns (nr. 24), but distinguished by not having the 

 vertical pleat on the carapace, and by strong dorso-lateral teeth on pleon 

 segments 1 — 3. 



Ireland, 6 miles off Galley Head, county Cork. 



