538 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 38. 



cut into eight well-separated teeth; a strong spine at each lateral 

 angle. Carapace covered with small whitish spots; very convex, 

 densely granulate, a little uneven, ridges faint. Lower surface of 

 carapace densely hairy, hair showing in dorsal view between the side 

 teeth. Front between the orbits quadridentate, teeth separated by 

 U-shaped sinuses; orbit with two open V-shaped sinuses above. 

 Buccal cavity without a longitudinal ridge. Cheliixnls and legs 

 similar to those of CaUinectes; arm spines feebler, none on outer 

 edge; a spine at inner angle of wrist. Abdomen of male more trian- 

 gular, less T-shaped than in CaUinectes. 



Width 75 to 85 mm. 



Sand beach, Ancon, February 1::. 



Not previously known from Peru. 



Distribution. — From west coast of Mexico to Peru. 



PORTUNUS (PORTUNUSi ACUMINATUS (Stimpson). 



Plate 49, li.L,'. 4. 

 Acheloiis acuminatum Stimpson, Ann. Lye. Nut. Bist. X. Y., vol.10, 1871, p. 112. 



A small, pubescent species. Carapace twice as broad as long,sub- 

 hexagonal; antero-lateral margin armed with eight small curved 

 teeth, of which the second, fourth, and sixth are a little smaller; a 

 slender lateral spine; posterior margin truncate, angles rounded; 

 surface uneven, granulate on the elevated portions, ridges strong. 

 Of the four teeth of the front, those of the middle pair are more 

 advanced: intervals V-shaped. Chelipeds elongate, prismatic; arm 

 withfouror live spines on inner margin, a terminal outer spine; wrist 

 with two distal spines, one outer, the other inner and much longer; 

 the seven ridges of the palm strong, granulate; a proximal spine and 

 on upper margin a subdistal spine; lingers strongly ridged, tips dark 

 colored and crossing. Legs much as in the preceding; the swim- 

 ming feet have a spine at the distal end of the lower margin of the 

 merus. Abdomen of male triangular. 



Width about 30 mm. 



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

 S, 101)7. 



Dredged, Baj of Sechura, about half-waj between Bayovar and Matacaballa, in 

 :, in 6 fathoms, April in, L907. 



Distribution. From Panama to Peru. 



CANCER POLYODON Poeppig. 



Plate 38, fig. ■_'. 



Cancer dentatus Bell, Proc. Zool. Soc. London, vol. :'.. L835, p. 87; Trans. Zool. 

 Soc. London, vol. I, L835, i>. 339, pis. i">. 17. figs, I and 5. Not G.dentatxts 



II KltliST. I , - - 



Cancer polyodon IV.itk;, Arch, fur Naturg., vol. 2, pt. I, L836, p. 133. 

 Large and hair\ . Carapace broadly oval, very convex, closely 

 granulate; antero-lateral margin very long, armed with ten broad. 



