408 PERCY SLADEN TRUST EXPEDITION 



meropodite of tliis leg is longer than in either of the other species, equalling f of the 

 length of the hand, (5) the hinder pair of the dorsal spines of the telson lies farther back 

 than in A. gardineri. 



Length of single specimen 15 mm. 



S. Nilandu Atoll. 



Family Gnathophyllid^. 



Professsor Gardiner's collection contains specimens of members of the genera Gnatlio- 

 phyllum and Hymenocera and also of the very interesting species described by Dr Balss 

 as Hymenocera ceratophthalma. An examination of this material makes it quite clear 

 that the species in question are all members of a single family. The principal characters 

 of this family are as follows : 



(1) The body retains the typical caridoid facias, but is rather heavily built. 



(2) The rostrum is compressed and dentate. 



(3) The antennal spine alone remains on the carapace. 



(4) The antennule has a well-developed stylocerite, and the outer flagellum thick 

 at the base and cleft for a very short distance at the end of the thick part. 



(5) In the antenna the scale may be broad or rather narrow, and is rounded at 

 the end, and the spine of the basipodite is short or absent. 



(6) The mandible is simple, palpless, slender, and curved. 



(7) The inner lacinia of the maxillule is pointed and curved towards the outer 

 lacinia. 



(8) The first lobe of the maxilla is totally lost and the second lobe is either lost 

 or very small but still obscurely double. 



(9) The first maxilliped has a flagellum and the outer border of its epipodite is 

 notched, but not deeply. 



(10) The end -joint of the second maxilliped is applied to the inner edge of the 

 recurved propodite. 



(11) The third maxilliped has an exopodite, a simple epipodite, and an endo- 

 podite of four joints, some or all of which are greatly broadened. 



(12) The legs of the first two pairs are chelate, without exopodites and with 

 simple wrists. The two pairs are more or less dissimilar, and the second pair is the 

 larger. 



(13) The legs of the last three pairs are alike, without exopodites, and adapted 

 for walking. 



(14) The second to fifth abdominal limbs have a well-developed appendix interna. 



(15) The telson bears two pairs of spines at the sides, and at the end an outer 

 short and an inner longer pair of spines, a submediaii pair of slender feathered spines, 

 and a median pointed projection. 



