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and in the Strait of Makassar. Still anolher species was obtained by this Expedition, between 

 Flores and Sumba, it is described as the new Hemip. Sibogae. The last species, finally, is Hemip. 

 gracilis Sp. Bate, collected by the '^ Challenger" off Tablas Island, Philippines; this species, 

 established on rather young specimens, is insufficiently known, but may perhaps be identical 

 either with Hemip. crassipes or with the new Hemip. Sibogae. 



The species of this genus are all found in deep water, at depths of 500 m. and more, 

 but the vertical distribution is rather variable. So e. g. Hemip. crassipes has been taken at 

 depths of 500 m., but also between 767 and 950 fathoms, Hemip. Carpenteri at depths of 

 902 but also of 1644 fathoms and Hei)iip. spcciostis was obtained in water of 2 650 fathoms, 

 so that some of these species may be considered as truly abyssal. 



f 4. Hemipenaeus crassipes (W.-Mas.). 



J. Wood-Mason, in: Ann. Mag. Nat. Hist., Ser. 6, Vol. VIII, Oct. 1891, p. 281, 282, Fig. 7 (9). 

 A. Alcock, Indian Deep-Sea Crustacea, Decapoda Maciura and Anomala, Calcutta, I90i,p. 33; 

 Illustrations of the Zoology of the Investigator, Crustacea, PI. XLIX, Fig. i and 2. 



Stat. 45. April 6. 7°24'S., 118° 15'. 2 E. Flores Sea. 794 m. Fine grey mud, with some radio- 



lariae and diatomes. i young male. 

 Stat. 85. June 17. o°36'.5 S., 119° 29'. 5 E. Strait of Makassar. 724 m. Fine, grey mud. i almost 

 adult female. 



The female perfectly well agrees with the cited descriptions and figures. The carapace, 

 rostrum included, is 70 mm. long, the rostrum, 39 mm., being a little longer than the carapace. 

 Different from Alcock's description, the tubercle of the eye-stalks is rather prominent. E.xternal 

 maxillipeds reaching almost to the middle of the chelae of i^' pair, terminal joint slender, 

 excavate at base. First pair of legs as long as the antennular peduncle, second pair almost 

 reaching to the tip of the scales, while those of the 3'''^ pair extend with half the length of 

 the fingers beyond that tip; the legs of the 4* pair reach with the dactyli beyond the tip of 

 the scales, those of the 5'^^ with the dactyli and half the propodi. The merus of 3"^ legs is 

 16,5 mm. long and 3 mm. wide in the middle, the carpus is 19,5 mm. long. 



In the male the carapace with the rostrum is 26,5 mm. long; the rostrum, 9,5 mm. 

 long, measures a little more than half the length of the rest of the carapace, while in the 

 adult male it measures about a third that length. The straight lower margin of the rostrum 

 that just reaches beyond the middle of 2"'^ antennular article, appears slightly more ascending 

 than in Fig. 2 of the "Illustrations". The rostral carina may be foliowed to within a short distance 

 of the small tubercle that is situated just in front of the posterior margin of the carapace. 



Tubercle on the eye-stalks prominent. The external maxillipeds extend with their 

 dactyli beyond the tip of the antennal peduncles, reaching about to the middle of 2"^ anten- 

 nular article; the antepenultimate joint, a little shorter than the propodus and the dactylus 

 taken together, appears a little more slender than in the figure of the "Illustrations" and the 

 propodus is prolonged beyond the articulation of the dactylus, which is distinctly emarginate 

 at its base. The legs of the i^' pair just reach beyond the tip of the antennular peduncle, 

 while those of the 3''^ are as long as the scaphocerite ; the merus of 3"' legs is 9,5 mm. long, 

 the carpus 10,5 mm. The two leaves of the petasma are not yet united with one another. 



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