138 



Cumacea: 15. Ekdiastylidae, 1. Ekdiastylis 



Some of the pleou segments carrying a few denticles. Telson in 9 shorter 

 than peduncle of uropods, but equal to it in d, with about 6 pairs of lateral 

 spines on the narrowed section in 9, about 10 in d. Antenna 1 with 2"*^ 

 joint the shortest. Antenna 2 of 9 with no joints elongate. Maxilliped 3. 

 2'='*^ joint not distally expanded or elongate. Peraeopod 2 with 2"*^ joint pro- 

 duced into a curved spiniform tooth. Exopod of uropods about ^/^ds <jg fQjjg 

 as the peduncle, rather longer than the endopod, of which the first joint is 

 subequal to the 2*^*^ in the 9 (fig-)? but much longer than the 2°*^ in the d 

 (text). Surface of body with a silvery nacreous lustre. L. about 9*5 njm. 



Off Chile, lat. 46° 47' 30" S., long. TS" 15' 00" AV., depth 112 m. 



7. E. horridus (O. Sars) 1887 Diastylis horrida, G. O. Sars in: Rep. Voy, 

 Challenger, v. Id pars 55 p. 9. 55 t. 9 f . 1 — 8 | 1908 D. h., Zimmer in: Ergeb. Tiefsee- 



Exp., u8 p. 158, 184 t.43 f.79— 89; t. 44 f. 90— 92 | 1912 

 Ekdiastylis horridus, T. Stabbing in: Ann. S. Afr. Mus., 

 V. lOv p. 155. 



Pseudorostral lobes acute, well produced 

 horizontally in front of the rounded eyeless eye- 

 lobe, antero -lateral corners wanting. Carapace irre- 

 gularly grooved (or regularly, Zimmer), armed 

 with many unequal spinules. the whole lower 

 margin denticulate. Pedigerous segments with 

 transverse rows of spinules, side-plates with denti- 

 culate margins. Pleon spinulose, sometimes with 

 medio-dorsal row of spines. Little groups of 

 pellucid spots on sides of pedigerous segments 

 and pleon (Zimmer). Proximal half of telson 

 cylindric. the rest tapering with several pairs of 

 lateral spines and a much larger apical pair. 

 Antenna 1 with 2 strong spines at apex of 1^* 

 joint and long simple seta near end of lateral 

 margin. 3*^ joint shorter than 2^^*^. Peraeopod 1, 

 7*'^ joint very slender, much longer than the 6*^* 

 (G. 0. Sars), sometimes shorter or subequal (Zim- 

 mer, Caiman). Peduncle of uropods a little longer 

 than the telson, rather more than twice as long 

 as the exopod, to which the endopod is nearly 

 equal Avith 3 and 4 (G. 0. Sars) or 4 and 7 

 spines respectively on medial margin of its sub- 

 equal 1^^ and 2"^"^ joints. Colour yellowish white. L. 9 11 — 14 mm. 



Kerguelen, off Cumberland Bay, depth 239 m, and Gazelle Harbour, among red Algae. 



8. E. abbreviatus (O. Sars) 1871 Diastylis abbreviata, G. 0. Sars in: Ofv. Ak. 

 Forh., f.28 nr. 1 p. 74 | 1871 D. a., G. O. Sars in: Svenska Ak. Handl., n. ser. v.9 nr. 13 

 p. 30 1. 12 f.62— 64 I 1873 D. a., S. I. Smith in: A. E. Verrill in: Rep. U. S. Fish. Comm., 

 v.l p. 554 I 1879 D. abbreviatus, S. 1. Smith in: Tr. Connect. Ac, v.bi p. 113 | 1900 

 D. abbreviata, Zimmer in: Fauna arctica, v.l p. 420 | 1912 Ekdiastylis abbreviatus, 

 T. Stebbing in: Ann. S. Afr. Mus., w. lOv p. 155. 



Pseudorostral lobes much produced horizontally in front of the small 

 eyeless eyelobe, with serrulate edges; carapace large with finely roughened 

 surface, the whole lower margin rather strongly serrate, a pair of small 

 denticles on hinder part of the frontal lobe and another widely separated 



Fig. 91. 



E. horridus (Sars), telson and 



uropod. 



