Cumacea: 11. Diastylidae, 1. Diastylis 99 



. d. Frontal lobe and adjacent parts of carapace without denticles, 

 except at commencement of the denticulate carina which on each side curves 

 to run round subparallel to the lower margin. First 5 pleon segments 

 with longitudinal rows of denticles, telson geniculate, with 12 — 16 pairs of 

 slender lateral spines. Endopod of uropods with 11. 5. 3 spines on the 3 

 joints respectively. L. 12'5 — 22 mm. 



Coasts of N. Europe, West Greenland and Labrador, Atlantic coast S. of Labrador. 

 Alaskan area and Pacific coast north of Puget Sound; between lat. 81 ^ and 50^* 10' N., 

 and in depths between 9 and ].'222 m. 



17. D. bradyi Norm. .:'1844 Alauna rostrata. W. Thompson in: Ann. nat. Hist., 

 tUS p. 435 I ?1856 A. r., W. Thompson. Nat. Hist. Ireland, i\ 4 p. 392 | 1879 Diastylis 

 bradyi, A. M. Norman in: Ann. nat. Hist., ser. 5 v.3 p. 59 | 1888 D. b., A. 0. Walker 

 in: P. Liverp. biol. Soc, r.2 p. 178 t.l3 f.lO, 11 \ 1^6 D. bradii, A. M. Norman & T. Scott, 

 Crust. Devon Cornwall, p. 32 | 1909 D. b., A. M. Norman & CI. S. Brady in: Nat. Hist. 

 Tr. Northumb., ser. 2 u3ii p. 30 t. 8, 9. 



Near to D. raihkii, but having the carapace of the 9 mapped into areas 

 by lines of small denticles, chiefly transverse: the front margin of the anterior 

 pedigerous segments minutely crenulate; the pleon segments, including the 

 6*^, having a series of small spines on the lower lateral margin; peraeopods 

 with the 2'i<^ joint, especially in the 1^* pair, strongly spinose, 1^*^ joint of 

 exopods also spinose: 7 1'^ joint of 2"*^ pair (as figured) even shorter than the 

 '1'^^: endopod of uropods with 9- — 11, 3 or 4, 3 — -6 spines on the 3 joints 

 respectively. L. 11 — 12 mm. 



Lough Swilley, county Donegal, Ireland, 27 m; round England, in shallow water 

 to 6 m. 



18. D. goodsiri (Bell) 1855 Alauna g., T. Bell in: Belcher, Last arct. Voy., v. 2 

 p. 403 t. 34 f. 2, 2a-q (not f. 3) | 1859 A. phimosa, M. Sars in: Forh. Selsk. Christian., 

 1858 p. 127 I 1861 Cumu gigantea, Danielssen in: Nyt Mag. Naturv., u 11 p. 7 | 1871 

 Diastylis goodsiri, G. 0. Sars in: Svenska Ak. Handl., n. ser. v. 9 nr. 13 p. 5 | 1880 D. g., 

 Stuxberg in: Bih. Svenska Ak., v.b nr. 22 p. 21, 22, 24, 51, 52, 53, 59 | 1887 D. g., 

 H.J.Hansen in: Dijmphna Udb., p.241 t. 22 f. 5 — 5n; t. 23 f . 1 — le (detailed description) | 

 1900 D. g., G. 0. Sars, Crust. Norway, v.3 p. 54 t. 41 ] 1900 D. g., Zimmer in: Fauna 

 arctica, v.l p. 422 (with synonymy), 434 | 1911 D. g., Caiman in: Tr. zool. Soc. London. 

 V. I81V p. 383 I 1912 D.g., Caiman in: P. U. S. Mus., vAl p. 605, 662. 



Body robust, hirsute. Pseudorostral lobes produced, conical, horizontal, 

 antero-lateral corners obsolete. Carapace inflated, surface without denticles 

 (Sars), with plenty (H. J. Hansen, Caiman), with several furrows varying in 

 the 2 sexes. Pedigerous segments furrowed down the middle in the d, 3^^ 

 and 4^^^ in 9 dorsally coalesced, postero-lateral angles of the 5*^ acute, more 

 produced in d than in 9. Pleon segments 1 — 5 with postero-lateral corners 

 acute, produced backwards and strongly outwards, and in the <5 these segments 

 have medio-dorsal and lateral rows of denticles: telson in 9 as long as the 

 2 preceding segments combined, in d a little longer, with 20 pairs of lateral 

 setiform spinules. Eyelobe small, eye not perceived. Antenna 1, 1®* joint 

 longer than 2"*^ and 3*^ combined. 2*"^ longer than 3*^, principal flagellum 

 4-jointed, accessory small, 3-jointed. Antenna 2 of d" with very long flagellum. 

 Peraeopod 1 not very long, the plumose 2"*^ joint nearly as long as rest of 

 limb, the last 3 joints not very unequal. Peraeopod 2, 2"*^ joint denticulate, 

 5th longer than 6^'^ and 7'^ combined, 7*^' as figured not longer than 6*^ 3^^ 



