i8 



Median tooth of rostrum slender, styliform 6 



Median tooth of rostrum flattened, spatuliform, about Ys 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 . . . . J?, messor Stimpson 

 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 cf long and bulky, covered with fine hairs R. ivood-viasoni Alcock 



1. Rhyiichoplax uiessor Stimpson. 



1858. Rhynclioplax messor Stimpson. Proc. Ac. Nat. Sc. Philadelphia, 1S58, p. 109. 

 1907. Rhynclioplax 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, 1858, p. 109. 

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



Hab. Hongkong. 



3. Rhynchoplax krefftii (Hess). 



1865. Hymenicits krefftii Hess. Arch. Naturgesch., Jahrg. 31. i, p. 141, pi. 6, f. 5. 

 1882. Hymenosoma krefftii Haswell. Cat. Austral. Crust., p. 115. 

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



Hab. Sydney. 



4. Rhynchoplax rostrata (Haswell). ; 



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



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

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



Hab. Victoria. ; 



\ 



5. Rhynchoplax wood-masoni (Alcock). ■ 



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



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



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



j 



I 



