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The second pair has 15 and 18 segments, 



tlic third pair 1 7 and gments, 



the fourth pair 20 and 2 [ments, 



the ii 1 1 li pan- 2 1 and 2 1 segments, 



the si\th pair 22 and 'ments. 



rhe surface of the segments of the \ cirrus is smooth <>r nearlj -■<. the minute 



which make the surface hirsute in /.. nüoóarüa, are wanting in /.. conica. 



[*he can «lal appendages contain [8 segments in tin- specimen in which the sixth 



rirrns had 22 segments in each ramus. 



[*he p<nis in much like that "i /. nüoóarüa. 



This species h,i> collected at the following Stations during the expedition of H.M.S. "Siboga 



near Lucipara [slands; 8 [O November [899. 8 specimens. 

 ■ near Kur Island ito the West of the Kei [slands), Decembei 6 7 1899. 

 cimens. 



General Rem ark. Ai both places where specimens of /.. nüoóarüa were collected, 



mens ut' /.. conica were also found. lt cannot be made out, however, with the aid ol the 



rved material, whether the specimens were really found at exactly the same place and 



lived under absolutely similar circumstances, or not. The specimens of L. conica are smaller 



than most of /.. nüoóarüa; some of the latter, however, are as small as most of the L. conica, 



yet show the differences in the shape <>l the capitulum and of the valves, which 1 think are 



striking. There is therefore no reason lor me to admit that the one form represents 



younger, the other older specimens of the same species. On the other hand I would by no 



means be surprised if future investigations show that the two forms really belong together in 



some way or other. 



;. Lithotrya pacifica Borradaile. PI. IX. figs 13, 13a and 14. 



BORRAUAILE, I.. A., On some Crustaceans from the South Pacific. Part \'. Proceedings of 



the Zool. Soc of London. 1900, p. 70.S, l'l. LI. figs 3, 3a. 



On the east coast of Lombok two specimens of a Lithotrya were collected which 1 

 think belong t" the species described lor the first time by Borradaile from specimens from the 

 outer reef of Funafuti. 



The specimens from Lombok differ in several more or less important points from the 

 diagnosis given by Borradaile. I consider it useful therefore to give a figure of the largest of the 

 Lombok specimens (fig. 1;,) and to point out the most essential differences in a short description. 



The scutum is triangular, considerably shorter than the tergum, overlapping the latter 

 valve not a little; its external surface is very distinctly ridged. 



The tergum is somewhat narrow, more elongate-rhomboidal than triangular; its basal 



portion is overlapped on the one side by the scutum. on the other by the latus; externally the 



part not overlapped b) scutum and latus shows a prominent longitudinal ridge with the /ones 



of growth running transversely and nearly straight. The latus is long and stout, its length 



the length of the tergum, its extremitj being nearly on the same level with that of the 



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