AMPHILOCHIDAE : LEUCOTHOIDAE ,o S 



Colour (as preserved) pale horn-coloured, with numerous maroon specks over head, 

 peraeon, pleon, side-plates and 2nd joints of peraeopods 3-5, eyes dark brown. 

 Distribution. Petermann Island, 3 m.; South Orkneys; Kerguelen. 



Hoplopleon, n.g. 



Close to Peltocoxa but with mandibular palp absent, pleon segment 4 very long, telson 

 short, and accessory flagellum of antenna 1 absent. 



The finding of a second species closely allied to Peltocoxa australis, Brnrd., and ex- 

 hibiting the same features which distinguish the latter from the true European Peltocoxa, 

 renders a new genus necessary. The genotype is Peltocoxa australis, Brnrd. 1916. 



Hoplopleon medusarum, n.sp. (Fig. 54). 



Occurrence: Hoetjes Bay (Saldanha Bay), South Africa. 5. x. 26. o m. from Medusae. 



Fig- 54- Hoplopleon medusarum, n.sp. a. Gnathopod 1, with spine further enlarged. 

 b. Gnathopod 2. c. Pleon segments 3-6. 



Description. Very closely resembling australis, except in gnathopods 1 and 2 and 

 peraeopods 4 and 5 . 



Gnathopod 1 , 5th joint with 6-7 strong spine-setae on lower margin and apex, 6th 

 joint ovate, palm ill-defined, with 4 strong spine-setae, finger with spinules along inner 

 margin and a denticle near apex. Gnathopod 2, 5th joint with 6 strong spine-setae on 

 lower apex, 6th widening slightly to the transverse concave palm, defining angle 

 rounded, with 4 strong spine-setae. 



Peraeopods 4 and 5, 2nd joint with hind margin convex, not straight or nearly so as in 

 australis, the contrast most noticeable in peraeopod 4. 



Remarks. Whereas the specimens of australis were found amongst littoral Hydroids, 

 Algae, etc., the present specimens were extracted from a jellyfish. 



Family LEUCOTHOIDAE 



Stebbing, 1906, p. 161. 



Schellenberg, 1928 (Jr. Zool. Soc. Loud., 1928, pt. 5), p. 635 (new genus). 



Genus Leucothoe Leach. 



Stebbing, 1906, pp. 163, 724. 



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