DR WILLEY FROM THE SOUTH SEAS. 411 



dactyles, third longer than fourth or fifth ; sixth abdominal tergite with a broad tri- 

 angular median backward projection, flanked on each side by a spine ; endopodite of the 

 uropod very slightly longer than the telson, exopodite slightly larger than endopodite ; 

 telson elongate, narrowing gently towards the free end, which is truncate, bearing on 

 each side a short, strong spine, and in the middle a tuft of hairs, dorsal surface with 

 four pairs of movable spines." 



Length 30 mm. 



1 specimen from Ralun, New Britain. 



Family. Pandalid.\e. 



Genus. Pandalus Leach, 1814. 



Into this genus Ortmann has reunited the genera Plesionika, Nothocaris, and 

 Pandalopsis of Bate. Three species of Pandalidae from New Britain have certain 

 characters in common which appear to justify the foundation for them of a new sub- 

 genus equivalent to the above-mentioned groups of species. 



Subgenus. Parapandalus nov. 



Characters : — 



1. Carapace without lateral carinae. 



2. Rostrum long, slender, armed above and below with movable spines. 



3. First antenna with long flagella and pointed stylocerite. 



4. Hinder lobe of scaphognathite truncated. 



5. Third maxilliped with an exopodite. 



6. Fii-st leg subchelate' owing to a small projection of the propodite at the base 

 of the finger. 



7. Second pair of legs equal, with 25 — 30 joints in the wrist. 



8. Eye with large cornea, well-marked ocellus, and two-jointed stalk. 



9. Gill formula as in Pandalus (sens, str.), save that in two of the species 

 epipodites are wanting behind the third maxilliped. 



26. Pandalus (Parapandalus) serratifrons sp. n., Figs. 8« — Sd. 



Diagnosis : — " A Pandalus with the rostrum long, outreaching the antennal scale, 

 armed above and below with numerous small, similar, movable .spines, of which the 



1 The word subehelate hardly describes the structures in question satisfactorily. The impresBion 

 is not that of a practicable grasping organ. Reference to fig. M will make this clear. For some interesting 

 i-emarks on the subject of this limb in Pandalus see Caiman, Ann. Mag. N. H. (7) in. p. 27 (1899). 



