356 PERCY SLADEN TRUST EXPEDITION 



2. Ancyclocaris aherrans (Nobili), 1904. 



PalcBmonella aherrans, Nobili, Bull. Mus. Paris, 1904, v. p. 233. 

 Ancyclocaris aherrans, Nobili, Bull. Sci. Fr. Belg. xl. p. 52, PI. 4, fig. 9 (1906) ; 

 Ann. Sci. Nat. (9), iv. p. 64 (1906). 



Jibuti, under protection of Discosoma giganteum. Persian Gulf. 



3. Ancyclocaris latirostris (Lenz), 1905. 



Harpilius latirostris, Lenz, Abh. Senckenb. Ges. xxvii. p. 380, PI. 47, fig. 14 

 (1905). 



Ancyclocaris {X) latirostris, Nobili, Ann. Sci. Nat. (9), iv. p. 65 (1906). 



1 Eine nicht hestimmte Palcemonide, Ricbters, Decap. Mauritius, PI. 18, figs. 10, 

 11 (1880). 



E. Africa. Mauritius ? 



4. Ancyclocaris hermitensis (Ratbbun), 1914. 



Pericli'jnenes hermitensis, Rathbun, Proc. Zool. Soc. Lond., 1914, p. 655, PL 1, 

 figs. 1—3. 



Monte Bello Is. Torres Straits, under protection of Discosoma, wbose mouth it 

 enters at times. 



Miss Rathbun figures the antennal scale of this species without a distal spine. 

 In specimens from Torres Straits which resemble hers in every other respect, including 

 the jcolour pattern, the outer edge of the scale is straight from the base to a well-formed 

 distal spine, and then curves abruptly inwards. 



Genus Pal^monella Dana, 1852. 



U.S. Explor. Exped. Rep. xiii. l. p. 582. Kingsley, Proc. Ac. Philadelphia, 1879, 

 p. 425 (1880). Bate, " Challenger" Macrura, p. 786 (1888). Ortmann, in Spengel, Zool. 

 Jahrb. Syst. v. p. 513 (1890) ; Bronn's Thierreich, v. ii. p. 1132 (1899). 



Definition : Body slender ; sixth abdominal segment of moderate length ; rostrum 

 straight or a little upcurved, shallow, with several teeth above but few below ; outer 

 flagellum of antennule deeply cleft or not ; antennal scale of good length and moderate 

 breadth ; mandible with palp ; second maxilliped without even a vestige of podobranch, 

 and with last joint mediad of preceding joint ; third maxilliped narrow, with vestigial 

 arthrobranch ; legs slender, with slender, slightly curved dactylopodites, biunguiculate 

 or not in last three pairs. 



Key to the species of Palcemonella : 



I. Second leg unarmed : its wrist less than half the length of its hand. 



A. No hepatic spine. 



1. Wrist of first leg longer than hand. Dactylopodites of last three legs 

 simple. (R. =f.) 



P. orientalis Dana, 1852. 



