73 



the tooth on the middle of the gastric region, that does not exist in Scyll. vitiensis\ the 

 squamiform prominences and the sculpture on the abdominal somites are more developed and 

 more conspicuous than in Scyll. vitiensis. In Dana's species the carina of the 3" 1 tergum is the 

 most prominent of all, but in Scyll. gibberosus it is the fourth. 



General distribution: Fiji Islands (Dana); Amboina (de Man). 



2. Scyllarus orientalis (Sp. Bate). 



Arctus orientalis C. Spence Bate, Report on the Challenger Macrura, 18S8, p. 68, PI. IX, fig. 4. 

 Arctus orientalis A. Alcock, A descriptive Catalogue of the Indian Deep-Sea Crustacea, 

 Decapoda Macrura and Anomala, in the Indian Museum, Calcutta, 1901, p. 181. 



Stat. 302. Febr. 2, 1900. io°27'.9S., I23°28'.7E. 2i6m. Bottom: sand and coral sand. 1 adult 



egg-laden female. 

 Stat. 312. Febr. 14, 1900. 8° 19' S., H7°4i'E. Saleh-bay, north coast of Sumbawa. 27401. 



Bottom: fine, sandy mud. 1 young male and 1 young female. 



The adult, ova-bearing female measures 80 mm. from the anterior extremity of the 

 distal squame of the outer antennae to the end of the telson ; the carapace, measured in the 

 middle line, is 24 mm. long, the distance between the antero-lateral angles 25 3 / 4 mm. Conform 

 to Alcock's description the 3 ld joint of the antennular peduncle reaches by more than half its 

 length beyond the distal squame and in the two young specimens the whole 3 rd joint extends 

 beyond it ; the description in the Report on the Challenger Macrura, according to which already 

 the 2 nd joint should reach the extremity of the distal squame, appears therefore erroneous, as 

 is proved by the figure 4 and by the fact that the two specimens, obtained by that expedition, 

 were also adult. Bate's statement that the 2 nd , i. e. the 4*, joint of the antennal peduncle 

 projects as far as, if not slightly beyond, the distal squame is likewise wrong. 



In the adult female the orbits are 4 mm. broad, measured in the middle, and here 

 2 3 / 4 mm. distant from the lateral margin of the carapace, so that they are only on e and a 

 half as broad as distant from that margin; in the younger female from Stat. 312 

 the orbits are 2 3 /. mm. broad, the distance from the lateral margin i 3 / 5 mm. In fig. 4 of the 

 Challenger Report, which figure is for the rest quite accurate, the distance between the orbits 

 and the lateral margin appears a little too large. The anterior notch of the lateral margin 

 appears in that figure a little too deep. 



In the adult female the outer border of the proximal squame is armed with 4 teeth, 

 of which the i st and the 4* are rudimentary; of the two other teeth, which are well developed, 

 the anterior appears a little larger than the posterior; the inner edge carries 3 or 4 small 

 teeth, in the younger specimens 5 or 6. 



The very numerous, globular eggs are small, 0,4 — 0,42 mm. broad. 



The general colour of the three specimens is that of honey, in the larger female the 

 postero-lateral angles of the carapace are red. In the two younger specimens the smooth anterior 

 part of the i st abdominal tergum is beautifully red coloured, the squamiform tubercles on the 

 carapace are reddish and the first 3 or 4 abdominal terga are marked with small red spots. 



SIBOGA-EXI'EDITIE XXXIX a-. IO 



