104 Cumacea: 11. Diastylidae, 1. Diastylis 



margin of endopod's 3 joints respectively 7, 3, 2, P* joint subequal to 2"^' 

 and 3^ combined. Colour whitish with reddish brown tinge. L. o 9 mm^ 

 6 10 mm. 



Coasts of N. Europe, from Norway, Lofoten Isles to N. E. England; depths 37 

 to 942 m. 



26. D. neapolitanus 0. Sars 1879 D. neapolitana, G. 0. Sars in: Arch. Naturv. 

 Kristian., t.A: p. 57 t. 39. 



Near to D. rugosns (nr. 24). l>ut much smaller and without prominent 

 processes. Pseudorostral lobes rather long, horizontal, conically pointed, antero- 

 lateral corners obsolete. Carapace without prominent ridges or dentate processes, 

 but rough especially to the rear with crowded spinules. Pedigerous segment 

 5 with front margin not crenulate, postero-lateral angles obtuse; telson rather 

 shorter than peduncle of uropods, with seven pairs of lateral spinules. and 

 a rather larger apical pair. Eye distinct, not very prominent. Exopod of 

 uropods about ^j^^^ as long as the peduncle, longer than the endopod. which has 

 5. 2, 2, spines on medial margin of its joints respectively, the 1^* joint 

 equal to 2"*^ and 3^ combined without the coalesced apical spine. L. ovigerous 

 Q 5 mm. 



Bay of Naples, depth about 94 m. 



27. D. echinatus Bate 1865 D. e.. Bate in: Ann. nat. Hist., ser. 3 v. 15 p. 81 

 t. 1 f. 1 I 1866 D. echinnta, G. 0. Sars in: Nyt Mag. Naturv., *;. 15 p. 105 | 1869 D. e, 

 (j. 0. Sars in: Nyt Mag. Naturv., v. 16 p. 343 | 1872 D. e., G. 0. Sars in: Forh. Selsk, 

 Christian., 1871 p. 269 | 1879 D. e., A. M. Norman in: Ann. nat. Hist., ser. .5 r. 3 p. 56 ] 

 1883 D. echinatus, G. 0. Sars in: Forh. Selsk. Christian., 1882 nr. 18 p. 12 | 1894 D. e., 

 A.M.Norman in: Ann. nat. Hist., ser. 6 v.V6 p. 276 | 1900 D. echinata, Gr. 0. Sars, 

 Crust. Norway, v. 3 p. 57 t. 43 | 1900 D. c, Zimmer in: Fauna arctica, r. 1 p. 421 

 (synonymy, part.), 434 | 1905 D. e. juv.. Caiman in: Sci. Invest. Fish. Ireland. 1904 

 app. 1 p. 44. 



Pseudorostral lobes of moderate size, conically produced, horizontal, 

 laterally spinulose, antero-lateral corners obsolete in Q. rounded in d. denti- 

 culate. Carapace in Q tumid, nearly as broad as long, with 3 or i con- 

 spicuous spines extending forwards on each side to base of pseudorostrum, 

 the sides mapped into polygonal areas by rows of denticles, usually with 

 the angles accentuated by a larger spinule; in the more slender d the armature 

 less pronounced, but with addition as usual of lateral carinae. Pedigerous 

 segments each with dorsal pair of teeth, conspicuous in Q , postero-lateral 

 angles in segments 3—5 of 9 dentiform. Pleon segments 1 — 6 dorsally 

 and laterally and in d also to some extent ventrally denticulate; telson as 

 long as the peduncle of the uropods, with 3 pairs of lateral spinules. and 

 a somewhat larger apical pair. Eye inconspicuous. Antenna 1 of Q. P*^ joint 

 as long as 2"*^ and 3<^ combined, M slightly longer than 2"*^. Antenna 2 of d, 

 Hagellum very elongate. Peraeopod 1, 2"*^ joint as long as rest of limb, 

 the margins in this and more or less in all the pairs spinulose, the G*^^* joint 

 a little shorter than the 5**", scarcely longer than the 7*^. Peraeopod 2,. 

 'S^ joint produced into a conspicuous tooth, b^^ much longer than d^^ and 

 7*^ combined. T^^ longer than 6'^^. 3^ and 4*'' pairs of Q without exopods. 

 Exopod of uropods longer than endopod, which is half as long as the peduncle, 

 with 3, 2j 1 spines on its joints respectively, the 2"*^ joint longer than the 3*^, 



