540 PROCEEDINGS OF THE NATIONAL 'MUSEUM. vol.38. 



cut into from eighl to ten strong saw-teeth, some of which may 

 have an accessory tooth; last tooth with a dorsal ridge continued on 

 the carapace. Front four-toothed, teeth blunt, middle pair more 

 advanced, middle sinus deepest. Lower margin of orbit prominent, 

 bidentate, uppermargin with two closed fissures. Chelipeds strong, 

 smooth, unequal; a low protuberance on upper border of arm and an 

 acute tooth at inner angle of wrist; palms swollen, fingers shorter than 

 palm, gaping, dark-colored except at outer base, teeth and tips white. 

 Legs flattened, tips horny. Under part of carapace, upper border 

 of arm and margins of legs hairy. Color red. 

 Width 9 to 11 cm. 



Callao, May 18, L908. 



Distribution. — Ecuador; Peru; Chile. 



PLATYXANTHUS CRENULATUS A. Milne Edwards. 



Plate 39, fig. 2. 



Platyxanthus crenulatus A. Milne Howards, Bull. Soc. Philom. (7), vol. 3, 1879, 

 p. 106, pi. 2, fig. 1. 



Large. Carapace transverse, subhexagonal, very convex, uneven. 

 Antero-lateral margins angled, cut into four teeth, exclusive of orbital 

 angle; three teeth are broad and subtruncate, posterior tooth subacute, 

 thickened. Of the four frontal teeth, the two outermost are broad, 

 obliquely truncate. Inner suborbital tooth flattened, broadly 

 rounded. Chelipeds very strong and unequal; a stout tooth above 

 arm, another at inner angle of wrist ; chelae more compressed than in 

 P. orHgnyi; lingers as long as palm, dark color extending the length 

 of prehensile border (the teeth themselves are white), but less than 

 half way up the outer edges. Legs much narrower than in the pre- 

 ceding; dactyli prismatic, hairy. 



Width 8 to 9 cm. 



Taken in boat, beam trawl dredginc; in 7 i<> 8 fathoms, southeast <»f Caleta Colon, 

 Bay hi' Payta. Soft mud bottom. April 13. 

 Thrown on the beach near the mouth of 1 1 1 < - Rimac by a Btrong sea, February I, L907. 

 From the beach at Pisco, July 7, 1!I()S. 



Distribution. — From Peru to Patagonia. 



XANTHO GAUDICHAUDII Milne Edwards. 



Plate 39, fig. 1. 



Xantho gaudichaudii Milne Edwards, Eist. Nat. Crust., vol. 1. L834, p. 396.— 

 Mum: Edwards and Ltjcas, d'Orbigny's Voy. Auh't. Mer., vol. 6, pt. 1, 



L843, p. 17.; vol. it, alias, IS 17. |>1. 7., I'm. 4. 



Of medium size. Carapace octagonal, thick, deeply areolated ; 

 antero-lateral margin with three teeth remote from orbit; postero- 

 lateral margin straight; front, between orbits, one-fourth as wide as 



