94 Cumacea: 11. Diastylidae, 1. Diastylis 



Antenna 1, 1^* and 3"^ joints subequal, 2^^ shorter than either. Peraeopod 1, 

 2"^^ joint shorter than rest of limb, 6*^^ joint longer than b^^\ and nearly 

 twice the 7^\ Peraeopod 2, 6*^^ and 7'i» joints together '^/./^ of the b^\ 

 3^^ and 4*'^ pairs without rudimentary exopods. The 3*^ to 5*^ pairs with 

 tubercles produced at lateral end of 4**^ joint. Peduncle of uropods subequal 

 to telson, with a dozen spinules on the medial margin; exopod curved, 

 shorter than the endopod, which is about half as long as the peduncle, the 

 1^* joint longer than 2"'^ and 3'^ combined, spines on the medial margin 

 respectively 6, 3, 2. L. 9 12 mm. 



Korea, depth 68 m. 



9. D. algoae Ziramer 1908 D. a., Zimmer in: Ergeb. Tiefsee-Exp., r. 8 p. 158, 

 188 t.44 f. 9H— 98; t. 45 f. 99—108 ] 1910 D. a., T. Stebbing in: Ann. S. Afr. Mus., 

 V. 6 IV p. 418. 



General surface finely granular, integument hard, brittle. Pseudorostral 

 lobes produced much in advance of the eyeless eyelobe, horizontal, each 

 acute, apices separated by small emargination; carapace covered with micro- 

 scopic forward pointing denticles, frontal lobe with pair of longitudinal pit- 

 like depressions. Pedigerous segments 1 — 4 about as wide as the carapace, 

 3'^ and 4*'^ dorsally distinguished only by suture line, 5^^ with sides acutely 

 extended along P* pleon segment; telson much longer than b^^ pleon segment 

 with lateral setules on the proximal section, the narrow distal section nearly 

 twice as long with some 16 pairs of lateral spines. Antenna 1, 2"*^ joint of 

 peduncle the shortest, 2^^'^ joint of principal flagellum the longest. Maxilliped 3, 

 3'^ joint rather wider than 4*^. Peraeopod 1 not very long, 2"'^ joint about 

 as long as rest of limb, 6*'^ joint longer than 5^\ 5"^ than 7*^. Peraeopod 2, 

 5*^ joint rather longer than 6*^ and 7^^ combined. No exopods on the 3'^ and 

 4*^1 pairs of the 9 . Peduncle of uropods longer than the telson, with 

 21 spines on the medial margin; exopod rather more, endopod a little less, 

 than half the peduncle, 1^*^ joint of endopod equal to 2^*^ and 3*^ combined, 

 spines on the medial margin respectively 6, 4, 3. Colour white. L. 9 9 mm. 



S. Africa, Algoa-Bay, depth 40 — 55 m. 



10. D. spinulosus Heller 1875 D. spinulosa. Cam. Heller in: Denk. Ak. Wien, 

 17.35 p. 28 t. 1 f. 5 I 1879 D. nodosus, G. 0. Sars in: Arch. Naturv. Kristiau., vA p. 472 | 

 1883 D. spinulosus, G. 0. Sars in: Forh. Selsk. Christian., nr. 18 p. 12, 57 | 1885 D. nodosa, 

 O. O. Sars in: Norske Nordhavs-Exp., w. 6 nr. 14 p. 61 t. 7 f. 1— 4 | 1886 D. n. + D. 

 spinulosa, G. O. Sars in: Norske Nordhavs-Exp., v. 6 nr. 15 p. 22; 21 | 1887 D. s., H. J. 

 Hansen in: Uijmphna Udb., p. 241 | 1887 D. s., H. J. Hansen in: V^id. Meddei., «. 39 

 p. 205 I 1900 I>. s., G. 0. Sars, Crust. Norway, v. 3 p. 55, 56 t.42 | 1900 D. s. + D. nodosa, 

 Zimmer in: Fauna arctica, ». 1 p. 425, 4.34 (with synonymy); p. 423, 433 | 1901 D. s., Ohlin 

 in: Bih. Svenska Ak.. r. 26 nr. 12 p. 47 t. 6 f. 10a— d. 



Pseudorostral lobes well produced in front of eyeless eyelobe, horizontal, 

 acute, sides minutely denticulate; carapace large, with a pair of spines on front 

 of frontal lobe, behind which are two outward curving rows of 4 conspicuous 

 spines, while dorso-laterally large groups of forward pointing spines are very 

 conspicuous, these being nodose instead of sharp and somewhat less numerous 

 in young specimens. Pedigerous segments 1 — 4 are spiniferous, with a 

 specially conspicuous pair of spines dorsally, the 5*^ segment having an 

 unpaired median spine. Pleon segments coarsely denticulate, with postero- 

 lateral corners produced outwards; telson longer than the 2 preceding segments 

 combined and than the peduncle of the uropods, with about 8 pairs of lateral 

 spines. Antenna 1, 1*^ joint longer than 2"*^ and 3^^ combined. Peraeopod 1 



