Cumacea: 10. Diastyloididae, 1. Diastyloides 



87 



o-erous segment 5 with postero-lateral angles acute, in the d produced. Telson 

 much shorter than peduncle of the uropods, with 5 pairs of lateral spines 

 on distal half in the 9, longer and much narrower with angular projection 

 in the (S. Antenna 1 with i^^ joint shorter than 2'i* and 3^ combined, the 

 principal flagellum small, 5-jointed in d, 3-jointed in Q, accessory 3-jointed. 

 Antenna 2 of 9 with 3 terminal joints very short. Mandibles with conical 

 process over the molar, spines of spine-row not numerous. Peraeopod 1, 



Fig. 50. 



D. serratus (Sars), 



mandible. 



Fig. 52. 



D. serratus Sais, 



pleopod 1. 



Fig. 51. 

 D. serratus (Sars), peraeopod 1. 



Fig. 53. 



D. serratus (Sars), 



pleopod 2. 



2^^^ joint spinose, much shorter than rest of limb, 6*^ joint shorter than 2*^'* 

 more than twice as long as 7^^. Peraeopod 2 with spine on apex of the 

 3d joint. Peduncle of uropods longer than the rami, the endopod rather the 

 longer, especially in the d, the first joint much longer than the 2"*^ and 3*^ 

 combined, spines on medial margin of the 3 respectively in the 9 9, 2, 1, 

 in the d 13, 3, 2. Colour yellowish white. L. 9 6 mm, (S 7 mm. 



Norway, Christianiafjord, 56— 188 m, West Finmark, 565 m; off Skagen lighthouse; 

 off Yorkshire coast, 7 — 11m; Mediterranean, near Capri, depth 950 m. 



2. D. biplieatus 0. Sars 1865 Diastylis biplicata, G. 0. Sars in: Forh. Selsk. 

 Christian.. 1864 p. 171 | 1867 D. lamellata, A. M. Norman in: Rep. Brit. Ass., u36 p. 197, 

 200 1 1879 D. calveri, (^ A. M. Norman in: Ann. nat. Hist., ser. 5 v. 3 p. 63 | 1894 



