BORRADATLE— ON CARIDES FROM THE WESTERN INDIAN OCEAN 401 



Family Hippolytid^. 

 Genus Sakon. 



8. Saron marmoratus (Olivier), 1811. 



Palcemon marmoratus, Olivier, Encycl. viii. {fide H. M.-Edwards). 



Hippolyte gibberosus and H. marmoratus, H. M.-Edwards, H. N. Crust, ii. pp. 378, 

 379, PL 25, fig. 8 (1837). 



Hippolyte gibberosa and H. marmorata, de Man, Arch. Naturg. liii. i. p. 533 (1888). 



Saron marmoratus, Borradaile, Proc. Zool. Soc. Lond., 1898, p. 1009 ; Kemp, Eec. 

 Ind. Mus. X. p. 84 (1914). 



The rest of the synonomy of S. marmoratus will be found in the last two papers 

 quoted. 



Kemp {loc. cit.) has shown that the relation of the two forms of the male of this 

 species is not, as 1 had formerly suggested, a true dimorphism, since the individuals 

 do not fall into two well-defined groups but form a graded series. This does not appear 

 either in the present specimens, which are all of the gibberosus type, or in those which 

 served as the basis of my earlier remarks upon the subject, in which there were two 

 sharply-defined groups. I have, however, no doubt that Mr Kemp's solution of the 

 question is the correct one, and that the marmoratus characters are gradually assumed 

 by the males with age. 



The collection contains 28 specimens from Salomon, Amirante, the Maldives, Minikoi, 

 and Coetivy, Seychelles. 



9. Saron neglectus de Man, 1902. 



Abh. Senckenb. Ges. xxv. p. 854, PI. 26, fig. 58. Kemp, Rec. Ind. Mus. x. p. 87 (1914). 

 One specimen from Egmont Reef, Seychelles. 



Genus LiGUR. 



10. Ligur uvece (Borradaile), 1902. 



Parhippolyte uvece, Borradaile, Willey's Zool. Results, p. 414, PL 38, figs. 11 a — g. 



Ligur uvece, Kemp, Rec. Ind. Mus. x. p. 123 (1914). 



The original description of this species omits the fact that the meropodites of 

 the legs of the second pair, and the propodites of those of the last three pairs, are 

 multiarticulate. 



Numerous specimens from Aldabra. 



Genus Thor. 



11. Thor maldivensis Borradaile, 1915 (Plate 58, fig. 6). 

 Ann. Mag. Nat. Hist. (8), xv. p. 208. 



Diagnosis: The body is moderately compressed. The carapace is short, not keeled, 

 and has large supraorbital and small antennal spines. The third abdom,inal segment 

 projects in the middle behind. The rostrum, is very short, not reaching the end of the 

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