406 PERCY SLADEN TRUST EXPEDITION 



(5) The antenna has a broad scale, truncate at the end, and is without a spine 

 on its basipodite. 



(6) The mandible is deeply cleft, the molar process has a broad end, surrounded 

 with stout teeth, the incisor process is coarsely serrate, and there is no palp. 



(7) The inner lacinia of the maxillule is round-ended, and not curved towards 

 the outer lacinia. 



(8) The laciniae of the maxilla are aborted. 



(9) The exopodite of the first maxilliped has no flagellum, and its epipod 

 is simple. 



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

 the recurved propodite. The epipodite of this limb is discoidal. 



(11) The third maxilliped is slender, and has no exopodite, but a short broad 

 epipodite. 



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

 wrists, and subsimilar, but the second pair is longer and stouter than the first. 



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

 for walking. 



(14) The first five abdominal limbs have a well-developed appendix interna, and 

 in the first of them, especially in that of the male, the endopodite is small, so that it 

 forms with the appendix a biramous organ. 



(15) The telson bears two or three pairs of spines above, and at the end one 

 strong pair of spines and several stout bristles, of which one or a pair are feathered. 



(16) The gills comprise pleurobranchs for the legs and an arthrobranch for the 

 third maxilliped. There are epipodites on the maxillipeds only. 



The family appears to be transitional between the Palsemonoida and the Crangonoida. 



The genera of Anchistioididee may be distinguished as follows: 



I. Without a blunt process of the carapace behind the eye. Scaphocerite present. 



The end of the telson bears, among others, one unfeathered bristle on each side and a pair 



of small lateral spines. 



Anchistioides Paulson, 1875. 



II. A blunt process of the carapace behind the eye. No scaphocerite. The end 

 of the telson bears, among others, more than one unfeathered bristle on each side at 

 the end of the telson, but no small lateral spine. 



AmphipalcBmon Nobili, 1901. 



Genus Amphipal^mon. 



The species of Amphipalcemon are closely similar in most respects, but may be 

 distinguished as follows : 



