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Pt. easterana, Mem. Mus. romp. Zool. Harvard Coll., v. 35, n" 2, 1907, p. 31, pi. 2, f. 4, 



pi. 7, f. 4 — \a. luister Island (eastern Pacific) 

 Pt. johannae, Proc. U. S. Nat. Mus., v. 46, 1914, p. 354, pi. 30, f. 1—3. Johanna Island 



(western Indian Ocean) 

 Pt. altimanus {Varuna altimana). Proc U. S. Nat. Mus., v. 47, 1914, p. 70. Luzon (Philippines) 

 Pt. guijulugani, Proc. V. S. Nat. Mus., v. 47, 1914, p. 71. Negros (Philippines) 



Though the "Siboga" expedition has not added any new species to the list, one of 

 Miss Rathbun's new species has been collected. 



Key to the species (based on the characters of the c?) x ) : 



1. Carapace with antero-lateral teeth sharp and salient; regions 



distinct; front laminar, straight. Inner angle of arm nearly 

 always armed with a more or less long spine. Meropodites 

 of ambulatory legs with a subdistal spine at anterior margin 2 

 Carapace with antero-lateral teeth not very acute; regions 

 generally indistinct; front more or less sinuous at anterior 

 margin. Inner angle of wrist subrectangular or slightly 

 pronounced, but never spiniform. Meropodites of ambula- 

 tory legs near distal end of anterior margin with a blunt 

 prominence or unarmed 7 



2. Inner angle of wrist of cheliped with a small tooth (no spine); 



inner surface of palm hairy Pt. dentatus de Man a ) 



Inner angle of wrist of cheliped spiniform; inner surface of 

 palm not hairy 3 



3. A tuft of hair in the finger-cleft, extending along the fixed 



finger Pt. onyx Alcock 3 ) 



Chelae entirely without hairs 4 



4. Upper border of palm transformed into a coinpressed keel ; 



inner angle of wrist with a long spine 5 



Upper border of palm simply rounded ; inner angle of wrist 

 with a short spine 6 



5. Exognath of ext. maxillipeds twice as broad as ischium . Pt. spinicarpus Ortmann 4 ) 

 Exognath of ext. maxillipeds about i 1 ^ times as broad as 



ischium Pt. altimanus (Rathbun) 



6. Ext. orbital angle and anterior epibranchial tooth separated 



by a narrow sinus; distance betvv. ext. orbital angles much 



1) In preparing this key 1 have based myself on the division of the genus into three sections that were distinguished by 

 ue Man (1. c. p. 542). 



2) Weber's zool. Erg. Keise niederl. Ost-Indien, Bd 2, 1892, p. 318, pi. iS, f. 9: ALCOCK, I. c. p. 403. Hab. Celebes, Bay of 

 BeDgal and Upper Tenasserim. 



3) L. c. p. 404. Hab. Tavoy. 111. Zool. "Investigator", Crust. prt. 10, 1902, pi. 65, f. 4. 



4) Sec DE Man, Zool. Jahrb., Syst., Ud 9, 1895, p. 91, Bd 10, 189S, pi. 2S, f. 19. Hal). Atjeh. 



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