112 Cumacea: 11. Diastylidae, 3. Diastylopsis 



nearly equal rami, exopod slightly the shorter, P* joint of endopod longer 

 than 2°*^ and 3*^ combined, marginal spines numerous. L. about 9 mm. 



New Zealand, Lyttletoa Harbour, depth 2—9 m; Akaroa Harbour. 



4. D. crassior Calm. 1911 D. c, Calmau in: Tr. zool. Soc. London, »;. ]8iv 

 p. 312,381 t. 37 f. 13-18. 



Near to V. elongata, but pseudorostral lobes not raised, less acutely 

 produced: eyelobe not prominent dorsally. without apical tooth; pleon seg- 

 ments stouter, l^*- with no strong medio-ventral tooth but with 2 ventro- 

 lateral rows of denticles, postero-lateral angles of 3^ and 4*^ as well as 5tii 

 spiniform. telson less narrowed distally, peraeopod 2 with 2 ""^ joint little longer 

 than rest of limb, produced to a strong tooth at distal medial corner, the 3^ 

 joint having 2. and the \^^ 3 strong teeth, the following legs stouter and 

 longer than in the companion species; peduncle of the uropods twice as long 

 as the telson, about once and a half as long as the endopod, which is shorter 

 than the exopod. L. Q 9-25 mm, 6 unknown. 



New Zealand, Lyttleton Harbour, depth 2—9 m. 



5. D. annulata (Zimmer) 1902 Leptostylis a., Zimmer in: Ergeb. Hamburg. 

 Magalh.-Sammelr., v.2 Cumac. p. 10 tf. 15— 17 1 1908 Diastylopsis a., Zimmer in: 

 Ergeb. Tiefsee-Exp., v.8 p. 183, 190 [ 1909 D. a., Zimmer in: Ergeb. Schwed. Sudp.-Exp., 

 K.6 nr. 3 p. 1,2,23, v.7 nr. 3 t. 8 f. 131 — 133. 



Pseudorostral lobes not upraised, well produced in front of the eyeless 

 eyelobe, antero-lateral corners acute, producing a well marked sinus; carapace 

 with a longitudinal series of 3 forward pointing teeth on the frontal lobe, 

 which is crossed by 2 lines and bounded by a bilobed third line; to these 

 succeed a pair not" meeting in the middle, 3 others which nearly meet and 

 2 more which show no median interruption, the last of them forming the 

 upraised hind margin. The postero-lateral corners of the b^^ pedigerous seg- 

 ment are not outdrawn. The fifth pleon segment is little longer than the 

 6^^ or than the telson, of which the basal section carries 3 pairs of setae 

 while the narrowed end has 4 pairs of lateral spines and a somewhat larger apical 

 pair. Peraeopod 2, as figured, has the 4:^^ joint longer than the b^^; the 3*1 

 and 4^^ pairs have rudimentary 2-jointed exopods; the 4*^ and b^^ pairs 

 have the 2^^ joint remarkably short. The peduncle of the uropods is a little 

 shorter than the telson, but "longer than the endopod, in which the 1^* joint 

 is longer than 2''^ and 3*^ combined, the spines on the medial margin being 

 respectively 5, 2, 2. Colour yellowish white. L. g not fully adult, 6 mm. 



South Georgia, low tide to If) m. 



6. D. robusta (Zimmer) 1902 Leptostylis r., Zimmer in: Ergeb. Hamburg. 

 Magalh.-Sammelr., v.2 Cumac. p. 13 tf. 22-31 | 1908 Diastylopsis r., Zimmer in: 

 Ergeb. Tiefsee-Exp., v.8 p. 183, 190. 



Pseudorostral lobes shortly produced in front of the very small eyelobe, 

 antero-lateral corners bluntly produced and forming a distinct sinus. Cara- 

 pace shorter than the combined pedigerous segments, crossed by a pair of 

 lines or ridges which end without meeting near the back of the frontal lobe: 

 the pedigerous segments have the front margin finely denticulate, and the 3^ 

 and 4*^^ have each 2 ridges on the expanded sides parallel to the hind margin. 

 The pleon segments carry dorsally 3—6 plumose setae and have postero- 

 ventral spines; the 5^^ segment is rather longer than the 6^\ and the 6^^ 



