no. 1766. STALK-EYED CRUSTACEA OF PERU -RATUBUN. 54] 



carapace, subtruncate, bilobed, lobes concave: orbital margin with 

 three closed fissures and no teeth. Chelipeds unequal, stout, rugose« 

 arm short, denticulate above; wrist with two blunt teeth at inner 

 angle, one below the other; palm swollen ; fingers dark-colored, gaping, 

 teeth low. Legs short, thick; dactyli stout, furry, with short, horny 

 tips. 



Width 20 to 45 mm. 



Taken in trawl, Bay of Sechura, west of Matacaballa, depth about 5 fathoms, April 

 8, 1907. 

 Tide pool on shingle beach at La Punta, December, 1006. 



Distribution. — From Ecuador to Patagonia; Juan Fernandez. 



CYCLOXANTHOPS SEXDECIMDENTATUS (Milne Edwards and Lucas). 



Plate 40, fig. 1. 



Xantho sexdecimdentatus Milne Edwards and Lucas, d'Orbigny's Voy. Amer. 

 Mer., vol. 6, pt. 1, 1843, p. 15; vol. !), atlas, 1S47, pi. 7, %. 2. 



Of medium size. Carapace transversely suboval, the antero- 

 lateral margins being very long and arched, the postero-lateral mar- 

 gins short and nearly straight; front narrow, bilobed, lobes oblique, 

 truncate, separated by a closed fissure. Antero-lateral teeth eight 

 on each side, irregular in size and shape. Preorbital tooth, above and 

 below, well marked; three orbital fissures closed. Chelipeds stout, 

 very unequal; arm short and broad; wrist with two teeth at inner 

 angle and a short subdistal spine above; palm broad, compressed; 

 fingers dark, nearly closing. 



Width 40 to 45 mm. 



Taken in trawl, Hay of Sechura, west, of Matacaballa, depth about 5 fathoms, April 

 S, 1907. 



Dredged, Bay of Sechura. about half-way between Bayovar and Matacaballa, in 5 to 

 (i fathoms, April JO, 1907. 



I, olios de At'uera, March 25. 



Tide pool on shingle beach at La Punta, December, 1906. 



Dredged near northeast side of San Lorenzo Island, depth 2\ fathoms, February 5. 



Dredged in Bay of Chilca, September 2, 1907. 



[ndependencia Bay, taken in 1 fathom at the "Punta ('allao - ' of Isla V'ieja, July 

 20, 1907. "Cangrejos" of economic value. 



Distribution. — Ecuador to Chile. 



PANOPEUS PURPUREUS Lockington. 

 Plate II, dg. 2. 



Panopeus purpureas Lockington, Proc. Cal. Acad. Sci., vol. 7, 1876 (1877), p. 

 101.— A. Milne Edwards, (rust. Reg. Mex., 1880, p. 316, pi. 57, fig. :i. 



Carapace convex in both directions; regions well marked; surface 

 granulate and with several short transverse ridges; shape hexagonal; 



antero-lateral margin shorter than postero-lateral, armed with five 

 teeth (orbital included), the first two small and partly fused, the 



