OEDICEROTIDAE 



137 



Description. Integument smooth, except when seen under a high magnification, 

 when it has the appearance shown in the figure, viz. extremely minute denticles either 

 singly or in groups. Back rounded, though peraeon segment 7 and the pleon are some- 

 what imbricate in profile. Rostrum moderate, reaching not quite to end of 1st joint of 

 antenna 1, deflexed, evenly curved. Head not narrowly produced behind eyes. Eyes 

 invisible, probably represented by a patch of white pigment on base of rostrum. Side- 

 plates 1-4 rather deep, 1 subtriangular, expanded in front, as long as deep, 4 also as 

 long as deep, posterior margin shallowly emarginate, postero-inferior margin oblique, 

 straight. Postero-inferior angle of pleon segment 3 broadly rounded. Telson ovoid, 

 longer than broad, distal margin slightly convex, with two spinules set in notches. 



Fig. 76. Monoculodes antarcticus, n.sp. a. Gnathopod 1. b. Gnathopod 2. 

 c. Peraeopod 2. d. Integumentary sculpture from dorsal part of pleon. 



Antenna 1 reaching a short distance beyond peduncle of antenna 2, 1st and 2nd joints 

 subequal, 3rd shorter, flagellum a little longer than peduncle, 20-jointed. Antenna 2, 

 4th joint slightly longer than 5th. 



Gnathopod 1, 5th joint oblique, distally produced forwards, 6th oblong, longer than 

 5th, palm a little longer than hind margin, and defined by a long spine, with a small 

 tooth below the spine. Gnathopod 2, the narrow process of 5th joint extending only 

 half-way along lower margin of 6th joint, which is narrow oblong, palm defined by a 

 long spine. 



Peraeopods 1 and 2 stout, 4th~7th joints rather strongly expanded, 5th and 6th joints 

 subequal, 7th a trifle longer than 6th, cultrate. Peraeopods 3 and 4, 2nd joint narrow 

 pyriform, posterior margin distally straight or slightly concave, 4th expanded, much 

 wider than 3rd or 5th, 6th longer than 5th, 7th longer than 6th, almost as long as 4th. 

 Peraeopod 5, 2nd joint broadly pyriform, 4th not expanded, 4th and 5th subequal, 6th 

 a little longer. 



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