88 



i 2. Antero-lateral teeth of carapace not well separated ; anterior 

 margin of front bimarginate, sinuous, but nearly straight 

 in dorsal view. Exognath of ext. maxillipeds as broad 



as ischium, the latter increasing in width distally . . Pt. johannae Rathbun x ) 

 Antero-lateral teeth of carapace separated by triangular 

 incisions; anterior margin of front deeply sinuous in 

 dorsal view. Exognath of ext. maxillipeds somewhat 

 broader than ischium, the latter with subparallel sides . Pt. guijulugani Rathbun. 



13. Outer surface of palm granulate. Exognath of ext. maxilli- 



peds i 1 /» — 2 times as broad as ischium 14 



Outer surface of palm smooth. Exognath of ext. maxillipeds 



as broad as ischium Pt. pilipes (A. Milne-Edw. 



14. Distance betw. ext. orbital angles much shorter than length 



of carapace. Chelae coarsely granulate. Hind margins of 



propodites of walking legs thickly fringed, Varuna-Wke. Pt. intermedins de Man s , 

 Distance betw. ext. orbital angles very slightly longer than 

 length of carapace. Chelae finely granulate at outer sur- 

 face; immobile finger with a deep longitudinal groove. 

 Propodites of walking legs with very short setae . . Pt. easteranus Rathbun 4 ) 



1. Ptychognathiis altimanus (Rathbun). PI. 4, Fig. 5. 



1914. Varuna altimana Rathbun. Proc. U. S. Nat. Mus., v. 47, p. 70. 



Though this species has not been collected by the "Siboga", I had an opportunity of 

 examining 3 specimens, belonging to the Amsterdam Zoological Museum, and brought home 

 from Nias by Dr. Kleiweg de Zwaan. Only one of the two cT is quite perfect; the other, 

 much smaller one, lacks both chelipeds and some vvalking legs, while the 9, that is egg-bearing, 

 has lost all its limbs. The original specimen came from a river at Luzon (Philippines). 



The carapace is much fiattened, not granulate, but very minutely punctate. The various 

 regions are not well defined, but some, viz. mesogastric, cardiac, intestinal and inner branchial 

 regions, are infiated, while others (epigastric and hepatic regions) are slightly depressed. The 

 only deep 'sulcus is the nearly semi-circular cervical groove, situated behind the middle ot the 

 carapace, shallower in its median part; from either end parts backwarcl a very short groove, 

 concave outward, and another yet shorter groove runs transversely. The branchial regions are 

 scarcely defined from the obtusely-triangular intestinal area, and laterally they are strongly 



1) Proc. U.S. Nat. Mus., v. 46, 1914, p. 354, pi. 30, f. 1—3. Hab. Comoro Islands (north of Madagascar). 



2) Gnathograpsus pilipes A. Milne-Eclwards, Nouv. Avch. Mus. Paris, t. 4, 186S, p. 184, pi. 27, f. 6—10; Pt. pilipes Miers, 

 Ann. Mag. Nat. Hist. (5) v. 5, 1880, p. 311; Coelochirw, crinipis Nauck, Zeitschr. wiss. Zool., Bd 34, 1880, p. 66 (f. de Man, Zool. 

 Jahrl... Syst.. lid 2, 1887, p. 719); Pt. pilipisl de Man, Weber's zool. Erg. Reise niederl. Ost-Indien, P;d 2, 1892, p. 325. Hab. Philip- 

 pines, Batjan and Timor. 



3) De Man, Notes Leiden Mus., v. 1. 1S79, p. 69: Weber'.s zool. Erg. Reise niederl. Ost-Indien, Bd 2, 1892-, p. 322, pi. 19, 

 f. io. Hab. Moluccas and Tahiti (Ortmann, Zool. Jahrb., Syst., Bi 7, p. 711). 



4) Mem. Mus. comp. Zool. Harvard Coll.. v. 35, n° 2, 1907, p. 31, pi. 2, f. 4, pi. 7. 1'. 4 — 4a. Hab. Easter Island. 



SS 



