S2 A. Alcock — Garcinoloyical Fauna of India. [No. 1, 



Zool., 1887-88, p. 75, and Zool. Jahrb. Sysfc. VIII. 1894-95, p. 564 : Cano, Boll. Soc. 

 Nat. Napoli, III. 1889, p. 216: Walker, Journ. Linn. Soc, Zool., XX. p. 110: 

 Ortmann, Zool. Jahrb. Syat. VII. 1893-94, p. 84, and in Semon'a Forschungsr. 

 (Jena. Denk. VIIIj Crust, p. 46: ? J. R. Henderson, Trans. Linn. Soc, Zool., (2) 

 V. 1893, p. 373. 



Portunus (Thalamita) arcuatus, De Haan, Faun. Japon. Crust, p. 43, pi. ii. fig. 2. 



Differs from T. Ghaptaln in the following particulars : — 



(1) the front proper, though arched as a whole, is distinctly di- 

 vided into two broad shallow lobes the rounded outer angles of which 

 are very distinctly separated from the supra-orbital angles : 



(2) the antero-lateral borders are cut into 5 acute teeth of which 

 the last is decidedly the largest and most prominent : 



(3) the inner angle of the lower border of the orbit is more 

 prominent : 



(4) the chelipeds are everywhere more granular, their under sur- 

 face especially being covered with transverse squamiform markings : 

 the small spines on the oater surface of the Avrist are well marked : the 

 hand is everywhere covered with transverse squamiform markings and 

 is very distinctly 6 or 7-costate, and on its upper surface are 5 distinct 

 spines, of which 4 are large and acute. 



In the Indian Museum is a single specimen from the Persian Gulf 

 (besides 12 from Hongkong and Nagasaki). 



Our specimens are undoubtedly the Thalamita arcuata of De Haan, 

 which, according to A. Milne Edwards is synonymous with T. sima of 

 Milne Edwards. 



54. Thalamita admeta (Herbst) Edw. 



Cancer admete^ Herbst, Krabben III. iii. 40, pi. ivii. fig. 1. 



Portunus admete Latr., Audouin Explic. p. 84, Savigny Desor. Egypt. Crust, 

 pi. iv. fig. 4. 



Thalamita admete, Gnyier Regne Animal Crust, pi. ix. fig. 2: Milne Edwards, 

 Hist. Nat. Crust. I. 459 : Krauss, Sndafr. Crust, p. 24 : Dana, U. S. Expl. Exp. 

 Crust, pt. I. p. 281, pi. xvii. figs. 5 a-c : Stimpson, Proc. Ac. Nat. Sci. Philad. 

 1858, p. 39 : A. Milne Edwards, Archiv. du Mus. X. 1861, pp. 356, 367; and Nouv. 

 Arcbiv. du Mus. IX. 1873, p. 162 : Heller, SB. Ak. Wien, XLIIT. 1861, i. p. 355 : 

 and Crust. Sndl. Europ. p. 79, pi. ii. fig. 17. {fide Guerin) ; and Novara Crust, p. 28 j 

 Streets, Bull. U. S. Nat. Mus. VII. 1877, p. 105 : Hilgendorf, MB. Ak. Berl. 1878, 

 p. 799 : Richters in Mobius Meeresf. Maurit. p. 153 : Miers, Zool. H. M. S. Alert, 

 pp. 183, 23Ci; and Challenger Bracbyura, p. 194 : Cams, Prod. Faun. Medit. 

 p. 515, {fide Guerin) : de Man, Arcbiv. f. Naturges. LIII. 1887, i. p. 332; and in 

 Weber's Zool. Ergebn. Niederl. Ost.— -Ind. II. 1892, p. 285 : Thallwitz, Abh. Zool. 



Mus. Dresden 1890-91, No. 3, p. 46 : Ortmann, Zool. Jahrb,, Syst., VII. 1893-94, 



p. 83 ; and in Semen's Forschungsr. (Jena. Denk. VIII) Crust, p. 46 : J. R. 



Henderson, Trans. Linn. Soc. Zool. (2) V. 1893, p. 372 : Whitelegge, Mem. Austral. 



Mus. III. 1897, p. 138. 



