99 



<;, Cardiac region traversed by a spinulose longitudinal ridge, 

 fl^j Terga of 2°'^ — 5''' abdominal somites marked with a single, 

 deep, transverse groove which is broadly interrupted in the 



middle. Posterior margin of hepatic groove spinulose . . Tlioinsoni .Sp. Bate 

 (C. Spence Bate, Report on the Challenger Macrura, iSSS, p. 185, PI. X.W, 

 fig. I and XXVI, fig. i — 9). 



d„ Terga of 2"'^' — 5''' abdominal somites presenting at each side 

 only an inconspicuous, transverse row of shallow puncta. 



Posterior margin of hepatic groove unarmed Sibogac n. sp. 



c,_ Cardiac region smooth, not traversed by a spinulose, longitudinal 

 ridge. 

 Terga of 2°<^ — 5''^ abdominal somites smooth, without a deep 



transverse groove Challetigeri Balss 



(H. Balss, Ostasiatische Dccapoden, II. Die Xatantia und Reptantia. ]\lunclien 

 1914, p. 84). 



rt'j Carapace distinctly s]jinulose. 



Terga of 2'^^' — 5''' abdominal somites conspicuously sculptured, though 

 otherwise than in Ncphr. japonicus and aiidaniaiiiciis. Largest 

 spines at base of rostrum, like in Xcphr. aiidamanicus^ with 4 pairs 

 of smaller spines behind them arafnrensis de Man. 



I. Xcplirops andaiimiiiiiis W.-Mas. (PI. Ill, Fig. 15). 



Neplirops andainaniciis J. Wood-Mason, Illustrations Zool. "Investigator", Part I, Crustacea, 



PI. IV, 1892 and Part II, PI. VIII, Fig. 5, 1894. 

 Neplirops andauianicns A. Alcock, in: Annals Mag. Xat. Hist. Ser. 6. Vol. XIII, March 1894, 



p. 226. 

 Neplirops andainaniciis A. Ortmann, in: Zoolog. Jahrb. Abth. f. Syst. Bd. X, 1897, p. 273. 

 Neplirops tlioinsoni var. andamanica A. Alcock, A descr. Catal. Indian Deep-Sea Crustacea, 



Calcutta 1 90 1, p. 153. 



Stat. 12. March 14. 7°I5'S., 115° 15.6 E. 289 m. Bottom: nuid and broken shells, i male, 

 bearing on the right side of the carapace a Bopyrid. 



This species, first recognized and accurately figured b)- Wood-Mason, has afterwards 

 been described by Col. Ai.cock in his "Descriptive Catalogue" as a variety of Neplirops 

 Tlioinsoni .Sp. Bate: this fact, in my opinion, can only be explained b}- supposing that 

 the author of this work had no occasion to study specimens of the species collected by the 

 "Challenger": already in Alcck k's first description of 1894 the abdominal somites o{ Xcphr. 

 andaiiiajiicus were described as corresponding to all points wiili those of NcpJir. Thomsoni 

 Sp. Bate, their terga being sculptured in the same way. The differences between both species 

 are, however, so important that it is quite impossible to consider Wood-Mason's species as a 

 variety of the other. 



The male, captured by the ".Siboga", is 144 mm. long, while, according to .Ai.imck, 

 this species should attain a length of 174 mm.; the carapace without the rostrum is 43 mm. 



