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The second pair has 15 and 18 segments, 



the third pair 1 7 and 20 segments, 



the fourth pair 20 and 20 (21) segments, 



the fifth pair 2 1 and 2 1 segments, 



the sixth pair 22 and 22 segments. 

 The surface of the segments of the 4"' — 6^^ cirrus is smooth or nearly so; the minute 

 comb-like scales, which make the surface hirsute in L. nicobarica, are wanting in L. conica. 



The caudal appendages contain 1 8 segments in the specimen in which the sixth 

 cirrus had 22 segments in each ramus. 



The penis is much like that of L. nicobarica. 



This species was collected at the following Stations during the expedition of H.M.S. "Siboga"; 



Station 225': Reef near Lucipara Islands; 8 — 10 November 1899. 8 specimens. 

 Station 2 50: Reef near Kur Island (to the West of the Kei Islands), December 6 — 7 1899. 

 3 specimens. 



General Remark. At both places where specimens of L. nicobarica were collected, 



specimens of L. conica were also found. It cannot be made out, however, with the aid of the 



preserved material, whether the specimens were really found at exactlj- the same place and 



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



than most of L. nicobarica ; some of the latter, however, are as small as most of the L. conica^ 



yet show the differences in the shape of the capitulum and of the valves, which I think are 



very striking. There is therefore no reason for 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. 



3. LitJiotrya pacijica Borradaile. PI. IX, figs 13, 13^ and 14. 



BORRAUAILE, L. A., On some Crustaceans from the South Pacific. Part V. Proceedings of 

 the Zool. Soc. of London. 1900, p. 798, PL LI, figs 3, la. 



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

 think belono- to the species described for 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 

 diao-nosis o-iven by Borradaile. I consider it useful therefore to give a figure of the largest of the 

 Lombok specimens (fig. 1 3) 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 tercrum 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 by scutum and latus shows a prominent longitudinal ridge with the zones 

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

 about %*" the length of the tergum, its extremity being nearly on the same level with that of the 



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