188 



Abdominal pleura behind the 1st well developed. Telson elongate-sub- 

 quadrilateral, as long as the caudal swimmerets which are broadly foliaceous, the 

 exopodite divided near its distal end by an obliquely-transverse suture. 



Eyestalks short, eyes without pigment or facets. Antennular flagella about 

 as long as the carapace. 



The antennal scale is represented by a minute spine (" scaphocerite ") not 

 visible without a lens : inside it is a second minute spine (" stylocerite "). 



Mandibles with a large incurved 3-jointed palp. The 1st maxillae have the 

 coxa and basis well developed and carry a 2-jointed palp of considerable size. 

 The 2nd maxillae consist of well-developed and deeply-cleft coxa and basis, a 

 tapering endopodite, and a normal scaphognathite. 



All the maxillipeds have well developed exopodites and foliaceous epipod- 

 ites. The exopodite of the 1st maxillipeds is stout and broad and much longer 

 than the endopodite: those of the 2nd and 3rd (external) maxillipeds are 

 flagelliform and about as long as their endopodites. The endopodite of the 1st 

 maxillipeds is simple, slender, weak and short : those of the 2nd and 3rd maxilli- 

 peds are strictly pediform. 



Of the thoracic legs the 1st pair are much longer and vastly more massive 

 than any of the others and end in large chelae : the 2nd pair are slender and 

 chelate, and the 3rd-5th pairs slender and monodactylous. The first 4 pairs of 

 thoracic legs have large epipodites. 



The first pair of abdominal appendages are slender and uniramous in both 

 sexes, the 2nd-5th pairs are slender and biramous and have a slender styliform 

 internal appendix. 



The eggs are large. 



The branchial formula is as follows : 



Total 4 + r . + 7 ep . 10 + r. =14 +2r. + 7ep. 



The branchiae attached to somite VIII. consist each of a tapering plate one 

 edge of which is plumed. 



