534 PROCEEDINGS OF THE SAT10VAL MUSEUM. vol.38. 



fcrum. Chelipeds in the male long and very stout, palms much 

 swollen, longer than fingers, which gape narrowly in basal half; 

 chelipeds in the female feeble, fingers as long as palm. Legs slender, 

 subcylindrical. 



Lengtli 10 to 20 mm. 



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



, r > to 6 l';i tin mis, April 10, 1907. 



Not previously known from Pern. 

 Distribution. — Peru ; Chile 



EPIALTUS MARGINATUS Bell. 



Plate 36, fig. 2. 



Epiallus marginatus Bell, Proc. Zool. Sue. London, pt. 3, for 1835 (1836), p. 

 L73; Trans. Zool. Soc. London, vol. 2, 1836, p. 62, pi. 11, fig. 4 (female); pi. 

 13 (male). 



Large. Carapace very convex, suborbicular, save for the flat, 

 deflexed rostrum, smooth; lateral bonier marginate, two teeth 

 anteriorly, an obscure tooth at widest part of carapace and a trace 

 of another behind it. Rostrum subtriangular, tip bifurcate; pre- 

 orbital tooth present. Eye-stalks globular, sunk in the circular 

 orbits. Chelipeds elongate, very strong in male, two tubercles on 

 upper edge of arm, one tooth at antero-internal angle of wrist, fingers 

 long, gaping. Legs diminishing rapidly in length from first to 

 fourth, a setiferous tooth on under side of propodites increasing in 

 the same order; daetvli bluntly spinulous beneath. 



Length 8 to 10 cm. 



Sheila of crabs from Independencia Lay, July, 1907. 



"Apancora;" also called "Jaiva" by some. Taken in fish net near the shore, Mol- 

 lendo, .Lily 22 and 23. 



Distribution. — Galapagos Islands; Peru to Chile; Rio Janeiro ( '.). 



ACANTHONYX PETIVERII Milne Edwards. 



Plate 46, fig. 4. 



Acanthonyx petiverii Milne Enu irds, Hist. Nat. Crust., vol. 1, 1834, p. 343. — 



Dana. Crust. I'. S. Expl. Exped.,pt. 1. L852,p. L28; atlas, 1855, pi. 5, fig. 6. 



Acantiumyi emarginalus Mhak Edwards and Lucas, d'Orbigny's Voy. Amer. 



M.'r., vol. <i. pt. I. L843, p. 9; vol. !t, atlas, 1847, pi. ~k fig. 2. 



Small. Carapace elongate, subpentagonal, nearly smooth, a few 

 tufts <>f hair; lateral margins nearly parallel, trident ate, first tooth 

 large, at antero-lateral angle; preorbital tooth present; rostrum 

 -hoit. deflexed, tip bifurcate: each marginal tooth is fringed with 

 hair. Antennae visible either side of beak. Orbits in sides of cara- 

 pace; eves visible from above. Chelipeds short, considerably 

 enlarged in male; two tubercles on lower outer cdg,e of arm; wrist 

 cristate above; palm longer than lingers, which gape narrowly. Legs 



