iS 



5. Median tooth of rostrum slender, styliform 6 



Median tooth of rostrum flattened, spatuliform, about l /, the length 



of the rest of the carapace. Meropodite of cheliped with 4 — 5 teeth 

 at upper border, carpopodite with 4 — -5 blunt teeth at upper surface, 

 inner side of palm at base of fingers thickly clothed with hairs. 

 Each joint of ambulatory legs with two teeth at anterior or outer 

 margin, one in the middle, the other near distal end R. messor Stimpson 



6. Carapace ovate, with two teeth at either' side (the anterior scarcely 



prominent, the posterior sharp) ; median tooth of rostrum setose. 



Meropodite of cheliped with one subdistal tooth (at outer border?) R. setirostris Stimpson 

 Carapace subcircular (without rostrum), with three teeth, all prominent 

 (the posterior, above the base of the cheliped, being the largest) 

 at either side. Meropodite of cheliped with 4 blunt tubercles at 

 upper border and a sharp subdistal tooth at outer border. Cheli- 

 peds in d long and bulky, covered with fine hairs R. wood-masoni Alcock 



1. Rhynchoplax messor Stimpson. 



1858. Rhynchoplax messor Stimpson. Proc. Ac. Nat. Sc. Philadelphia, 1858, p. 109. 

 1907. Rhynchoplax messor Stimpson. Smithson. Inst., Miscell. Coll. v. 49, p. 148. 



Hab. Simoda (Japan). 



2. Rhynchoplax setirostris Stimpson. 



1858. Rhynchoplax setirostris Stimpson. Proc. Ac. Nat. Sc. Philadelphia, 185S, p. 109. 

 1907. Rhynchoplax setirostris Stimpson. Smithson. Inst., Miscell. Coll. v. 49, p. 148. 



Hab. Hongkong. 



3. Rhynchoplax krefftii (Hess). 



1865. Hymenicus krefftii Hess. Arch. Naturgesch., Jahrg. 31. 1, p. 141, pi. 6, f. 5. 

 1S82. Hymenosoma krefftii Haswell. Cat. Austral. Crust., p. 115. 

 1887. Hymenicus krefftii de Man. Zool. Jahrb. Syst, Bd 2, p. 695. 



Hab. Sydney. 



4. Rhynchoplax rostrata (Haswell). 



1882. Hymenosoma rostratiim Haswell. Cat. Austral. Crust., p. 116. 



1906. Hymenosoma rostratum Baker. Transact. Proc. R. Soc. South Australia, Adelaide, v. 30, 

 p. 114, pi. 3, f. 2. 



Hab. Victoria. 



5. Rhynchoplax wood-masoni (Alcock). 



1900. Hymenicus -wood-masoni Alcock. Journ. As. Soc. Bengal, v. 69, prt 2, p. 388. 



1902. Hymenicus wood-masoni Alcock. 111. Zool. "Investigator", Crust. prt 10, pi. 64, f. 3. 



Hab. Port Blair (Andamans), Port Canning (near Calcutta). 



18 



