102 



Cuniacea: 11. Diastylidae, 1. Diastylis 



23. D. scorpioides (Lepech.) 1780 Oniscus s., Lepechin in: Acta Ac. Petrop , 

 1778 v.l p. 248 t. 8 f. 2 I 1841 Cuma edioardsii, Kroyer in: Naturh. Tidsskr., v.3vi p. 504, 

 531 t. 5 f. 1 — IH I 1846 C. e. -\- C. brevirostris (5. Kroyer in: Naturh. Tidsskr., ser. 2 v. 2ii 

 p. 128. 207 t. 1 f. 1, 3, 5, 9—14; p. 174, 208 t. 2 f. 6 | 1849 C. e. + C. b., Kroyer in: Voy. 

 Nord Crust., t.4; t. 5A f. a — t | 1871 Diastylis e., G. 0. Sars iu: Svenska Ak. Hand)., n. ser. 

 V.9 nr. 13 p. 5 i 1879 D. e., A. M. Norman in: Ann. nat. Hist., ser. 5 v.^ p. 61 | 1880 

 D. scorpioides, Stuxberg iu: Bih. Svenska Ak.. v. 5 nr. 22 p. 21, 22, 52 | 1900 D. s., (Jr. 0. 

 Sars, Crust. Norway, v.S p. 58 t. 44 | 1900 D. s., Zimmer in: Fauna arctica, v.l p. 424 

 (with synonymy), 433 | 1901 D. edtvardsii, Ohlin in: Bih. Svenska Ak., v. 26 nr. 12 p. 52 | 

 1911 D. scorpioides, Stappers in: Camp. arct. Orleans, Crust. Malac. p. 112 t.4 f . 2 — 6, 

 11, 12 I 1912 D. s., Caiman in: P. U. S. Mus., u4l p. 605, 634. 



Pseudorostral lobes not greatly produced, conical, 

 horizontal, shorter and more obtuse in d than in Q , 

 antero-lateral corners faintly marked: carapace sculp- 

 tured with 5 pairs of crenulate oblique transverse pleats 

 or ridges, and the hind margin also raised and cre- 

 nulate, pedigerous segments with front margin more 

 or less distinctly raised and crenulate, postero-lateral 

 corners of 5^^! obtuse in Q , somewhat acutely pro- 

 duced in d. The non-ovigerous 9 having medio- 

 ventral processes (hyposphenes of Gilson) on segments 

 2 — 4, and a dorsal tooth on the 5*'^ (Stappers), pleon 

 segments 1 — 6 unarmed, telson shorter than peduncle 

 of uropods, with about 8 pairs of lateral spinules. 

 Eye distinct. Antenna 1, P* joint subequal to 2"'^ 

 and 3*^ combined. Antenna 2 of c?, flagellum much 

 shorter than usual in this genus. Peraeopod 1, 2"^^ 

 joint shorter than rest of limb, plumose, distally 

 spinulose, 7**^ joint shorter than 5^'' or Gth. Peraeo- 

 pod 2, 5^^ joint decidedly longer than 6*^ and 7t'» 

 combined, 7"^ longer than (5^^. 3^ and 4*^ pairs 

 without exopods in the 9 . Exopod of uropods 

 about half as long as the peduncle, endopod con- 

 siderably shorter, its 1*** joint a little longer than 

 2"*^ and 3*^ combined, spines on medial margin of 

 the joints respectively, 4 — 7, 2 or 3, 2 in 9, 7 or 8, 

 4, 3or4ind. Colour reddish brown. L. 9 10 — 20, 

 d 11—13 mm. 



West Greenland and Labrador, Atlantic coast of 

 N. America South of Labrador, off Newfoundland, lat. 47 •* 

 40' N., long. 47 » 35' 30" W., depth 377 m, but in Franz 

 D. scorpioi^rs' J) (Lepechin) ^^sep^ ^^^'^^ ^^'- ^S" «' N., long.270 17 W., depths between 

 (after Sars). 3—9 m. 



Fig. ."SS. 



24. D. rugosus 0. Sars 1865 D. riigosa, G. 0. Sars in: Forh. Selsk. Christian., 

 1864 p. 166 I 1866 D. r., G. O. Sars in: Nyt Mag. Naturv., v.] 5 p. 104 | 1869 

 D. r., G. 0. Sars in: Nyt Mag. Naturv., v. 16 p. 342 ] 1872 D. r., G. 0. Sars in: Forh. 

 Selsk. Christian., 1871 p. 269 | 1879 D. strigata (S, A.M.Norman in: Ann. nat. Hist.. 

 ser.o r.3 p. 62 | 1879 D. rugosa, G. 0. Sars in: Arch. Naturv. Kristian., vA p. 46 t.34— 38 | 

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

 A.M. Norman in: Ann. nat. Hist., ser. 6 u 13 p. 277 1 1897 D. rugosa, Ehrenbaum in: 

 Wiss. JLeeresunters., u2i p.416 | 1900 D. r., G. 0. Sars, Crust. Norway, v.3 p. 48 t. 37 | 

 1905 B. r., Caiman in: Sci. Invest. Fish. Ireland, 1904 app. 1 p. 45 | 1906 D. r., A. M. 



