BORRADAILE— ON THE PONTONIIN^ 373 



leg outreaching rostrum by wrist and hand, its arm and wrist subequal, fingers about 

 two-thirds length of wrist, palm a little longer than wrist, all joints smooth ; arm 

 bearing at end a spine below, and wrist a spine above, a similar spine inside, and a blunt 

 tooth below, fingers straight, bent slightly inwards from axis of palm, and armed with 

 two or three interlocking teeth ; last three legs slender, with a few spinules on underside 

 of propodites, and dactylopodites long and nearly straight ; telson pointed, with naked 

 submedian spines. 



Length of longer of the two specimens, 11 mm. 



Salomon I., Western Indian Ocean. 



21. Periclimenes (Falciger) dubius Borradaile, 1915 (Plate 54, fig. 12). 

 Ann. Mag. Nat. Hist. (8) xv. p. 211. 



Definition: Closely related to P. affinis, but differing in that (1) the rostral formula 

 is f , (2) the tip of the rostrum is bifid, (3) the stalk of the antennule is shorter and 

 stouter, (4) in the second leg the arm and wrist are stouter, while the fingers are rather 

 more than half the length of the palm and about equal in length to the wrist, (5) the 

 end of the telson bears a few bristles besides the ordinary spines. 



Length of the single specimen, 22 mm. 



Minikoi. 



P. elegans, P. affiyiis, and P. dubius are very closely related species and may 

 eventually prove not to be distinct. 



22. Periclimenes (Falciger) compressus Borradaile, 1915 (Plate 55, fig. 18). 

 Ann. Mag. Nat. Hist. (8), xv. p. 212. 



Definition : Body a good deal compressed ; rostrum outreaching antennal scale very 

 little, and antennular stalk rather more, deepest at its base, diminishing evenly towards 

 tip which is slightly upturned, bearing above five teeth, of which two stand behind the 

 orbit, and a minute vestigial tooth near the tip, and below three teeth ; antennal and 

 hepatic spines present ; first joint of antennular stalk well expanded, with strong distal 

 spines, second and third joints subequal, subcylindrical, together shorter than first joint ; 

 antennal scale narrow, with sides parallel, tip rounded, and distal spine not reaching 

 tip, antennal stalk not reaching end of first joint of antennule ; third maxilliped not 

 reaching end of antennal stalk; first leg outreaching antennal scale by more than half 

 the hand, its wrist, palm, and fingers subequal ; second legs equal and similar, out- 

 reaching antennal scale by hand, wrists short and subconical, with a notch on the inner 

 side, hands long, parallel-sided, somewhat compressed, fingers less than half length 

 of palm, a small tooth near the base of each moveable finger, and two or three vestigial 

 teeth on the fixed finger ; last three legs long, slender, without spines, and with long, 

 sharp, simple dactylopodites ; telson little shorter than uropods, long, and truncate. 



Length of single specimen, 24 mm. 



Saya de Malha. 



