| GRAPSIDAE. 33 
Abdomen of ¢ rather narrow; terminal segment much longer than 
wide. 
Dimensions: —Length of carapace 8.3 mm.; width 9.1 mm.; fronto- 
orbital width 7.5 mm.; front 4.4 mm. 
Sesarma (Sesarma) rotundatum Hess. 
Sesarma rotundata Hess, Arch. f. Naturg., 1865, 31, 1, 149, pl. 6, fig. 9. Miers, Proc. 
Zool. Soc. London, 1877, 133, 136. De Man, Zool. Jahrb., Syst., 1887, 2, 654, 682. 
Sesarma dentifrons A. Milne Edwards, Nouv. Arch. Mus. Hist. Nat. Paris, 1869, 5, 31. 
De Man, Zool. Jahrb., Syst., 1887, 2, 651; Jahrb. Hamburg. Wiss. Anst., 1896, 13, 
110, pl. 3, figs. 6 and 7. 
Sesarma gardineri Borradaile, Proc. Zool. Soc. London, 1900, 593, pl. 42, fig. 8. 
Sesarma (Sesarma) gardineri Nobili, Ann. Mus. Nat. Hungarici, 1905, 3, 497. 
Sarmatium faxoni Rathbun, Bull. U.S. Fish Comm. for 1903 (1906), part 3, 841, pl. 7, 
fig. 1. 
Aruo Atoll, Marshall Group; Jan. 27, 1900; 1 @. 
Distribution : — Oahu and Marshall Islands (Rathbun) ; Duke of York 
Island (Miers); Upolu (A. M. Edwards); Funafuti and Rotuma (Borradaile) ; 
Nairai, Fijis (Miers); Seleo, Berlinhafen, New Guinea (Nobili); Sydney 
(Hess). 
I think that Nobili is correct in his surmise that S. gardineri Borradaile is 
the same as S. rotundatum Hess. This is also the species that I mistakenly 
placed in Sarmatium, S. fazxoni (loc. cit.). In the two specimens before me, 
$ and 9, the anterior 2 of the branchial region is inflated. The ¢ (Aruo) 
has a soft shell, the lower edge of its front is visible in a dorsal view; in 
the 2 (Oahu) this edge is invisible in a dorsal view. In the ¢ the posterior 
margin of the orbit slopes distinctly outward and backward; in the ¢ almost 
imperceptibly so. 
Neither of these specimens agrees in detail with the type of S. dentifrons 
A.M.Edw. or of S. rotundatum Hess as figured by de Man ((oc. cit.), or with 
the figure of S. gardineri Borradaile, but the differences may be attributed 
to individual variation. 
Sesarma (Sesarma) trapezoideum (Milne Edwards). 
Sesarma trapezoidea Milne Edwards, Hist. Nat. Crust., 1837, 2, 74. De Man, Zool. 
Jahrb., Syst., 1887, 2, 654; 1889, 4, 426, pl. 9, fig. 7. 
Fatana River, Tahiti; Nov. 7, 1899; 1 ¢. 
3 
