58 



2. The rostrum is a normal prolongation of the end of the carapace . 

 mandibles with a slender palp : coxa and basis of 2nd maxillae 

 small but recognizable: in the 1st maxillipeds the epipodite is 

 independent, and the endopodite though extremely small is 

 distinct : 



i. Body compressed : 5th pair of thoracic legs no longer 



than the 4th : no epipodite on the 2nd maxillipeds ... STMPASIPH MA.. 

 ii. Body moderately compressed : 5th pair of legs [decidedly 

 longer than the 4th : 2nd maxillipeds with an epi- 

 podite ... ... ... ... ... PAHAPASIPHJEA. 



II. The abdominal appendages are filiform, the endopodites being very short 

 and the exopodites being of extraordinary length: the 4th pair of 

 thoracic legs are not much reduced in length : the mandibles have a 

 large foliaceous palp : the 2nd maxilla? and 1st maxillipeds are perfectly 

 normal in all their parts : the 2nd maxillipeds carry an epipodite and a 

 gill-plume ... ... ... ... ... ... PSATHYROCAUIS. 



PASIPH^A, Savigny. 



Pasiphsa, Savigny, Mem. Bur. les Anim. sans vertebres, p. 50, note : Milne Edwards, Hist. Nat. Crust. II. 424 : 

 Spence Bate, Challenger Crust, Macrura, p. 863. 



Body strongly compressed. Kostrum a short obliquely-ascendant post- 

 frontal spine or crest. Carapace short : the orbital and post-antennular angles 

 are defined but blunt, and the only spine is one situated immediately behind the 

 antenna. 



Abdominal pleura deep and wide : telson acute : the outer plate of the tail- 

 fan with a fine transverse suture. 



Eyes of fair size, placed obliquely and somewhat ventrally on the eye- 

 stalks. Antennular peduncle of fair length and supporting two longish flagella, 

 the outer of which is thickened at base : the antennular scale is of fair length. 



The mandibles consist simply of a serrated incisor process, without molar 

 process or palp. 



The 1st maxillae have the coxa, basis and palp well-developed, the inner 



edge of the basis being spinose. 



i 



The 2nd maxillae consist of a large scaphognathite and a short and slender 

 endopodite, the coxa and basis being undistinguishable. 



The 1st maxillipeds consist simply of a membranous leaf, the representative 

 of the exopodite : its outer proximal angle, which is produced, represents the 

 epipodite, and a papilla in the distal half of the inner border represents the 

 endopodite, but no trace of an independent coxa or basis is discoverable. 



The 2nd maxillipeds consist of a seven-jointed endopodite, without exopo- 

 dite or epipodite : the terminal joint is a distinct dactylus. 



