272 



F"inally there is a fourth species, A'. latifrons Burger'), which is so very aberrant that 

 its being referred to the present genus is certainly erroneous. Firstly the carapace is only 

 slightly broader than long ; secondly the orbits, though longitudinal, are lying on the ventral, 

 not on the dorsal side, of the cephalothorax, thirdly an epistome seems to be distinct and 

 finally the external maxillipeds are widely different, resembhng those of the Pmnotherinae : 

 merus and ischium are fused to a single piece and the dactylus is inserted at the inner margin 

 of the propodus, the exognath is of normal breadth, not rod-like. 



Key to X. pinnotheroides and A'. oósctcrus : 

 Carapace, at least anterior part, and walking legs hairy ; orbits 



longitudinal, parallel to each other. Propodite of first pair of 



walking legs as broad as long X. pmnotheroides White 



Carapace glabrous, walking legs hairy towards the tip only ; branchial 



regions of carapace with an oblique, low ridge ; orbits somewhat 



oblique, divergent backward. Propodite of first pair of walking 



legs longer than broad X. obscurus Henderson "). 



I. XenophtliabvAis pmnotheroides White. 



Literature: AlcüCK, Journ. As. Soc. Bengal, v. 69, prt 2, 1900, p. 332. 



Rathbun, K. Dansk. Vid. Selsk. Skr., 7. Raekke, Afd. 5, n" 4, 1910, p. 338, 

 textfig. 22. 



Stat. 4. Djangkar, east coast of Java. Depth 9 m. 7 (ƒ, 10 9- 

 Stat. 311. Sapeh Bay.east coast of Sumbawa. Depth 36 m. i cf, i 9- 



The carapace is for the greater part smooth, but towards the antero-lateral margins, 

 on the lateral parts of the hepatic regions, a thin covering of feathered hairs, such as are 

 found fringing the whole of the lateral borders, is observed. The greatest breadth, at the level 

 of the penultimate pair of legs, is nearly exactly 1.5 times the length of the carapace. A gastric 

 area, not subdivided, and beginning immediately at the end of the orbits, is distinctly outlined 

 by fine sulci and 2Y3 times as long as broad; behind it a kind of urogastric portion is developed, 

 which is again foliowed distally by a well defined cardiac region, somewhat broader and shorter 

 than the gastric area. From the end of the orbits parts on each side an oblique, indistinct, 

 straight crest to the constriction in the lateral margin of the carapace, and a similar, slightly 

 curved crest is discernible on each branchial region. Except at the abruptly sloping lateral 

 branchial regions the carapace is not vaulted transversely, and only moderately so in longitu- 

 dinal direction. 



The front is a distinct lobe, somewhat constricted near the base, with the anterior 

 margin straight and the lateral angles greatly rounded -, it is bordered laterally by the deep 

 orbits, which are completely filled by the club-like eye-stalks. The orbits in young specimens 



1) Zool. Jahib., Syst., Bd 8, 1895, p. 387, pi. 9, f. 32, pi. 10, f. 32. Hab. Philippines. 



2) Transact. Linn. Soc. London (2), v. 5, 1893, p. 394, pi. 36, f. 18 — 19; Alcock, Journ. .A.s. Soc. Bengal, v. 69, pit 2, 1900, 

 p, 333; Rathbun, K. Dansk. Vid. Selsk. Skr., 7. Raekke, Afd. 5, n« 4, 1910, p. 338, pi. 2, f. 13, textfig. 23. Hab. Gulf of Martaban, 

 Ganjam coast, Andamans, Gulf of Siam. 



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