Boone, Crustacea, Cruises of "Ara" and ''Alva" 233 



wider, out-jutting apex of the lower dactyl. The cutting edge of 

 the lower dactyl is similarly dentate to that of the upper one, the 

 opposed teeth interfitting ; a single larger tooth occurs distally 

 on the lower dactyl. 



The ambulatories are of the typical Cancer form, long, slen- 

 der, laterally compressed, with dual carinae on the upper, outer 

 surface of the carpus, a single carina on the upper surface of the 

 propodus, the latter and more conspicuously carinate, the dactyl 

 being longitudinally grooved on the outer face. The dactyl is 

 about one-fifth to one-fourth longer than the related propodus, 

 slender, curved, very acuminate, brown or blackish tipped. 



The male belt has the third, fourth and fifth articles fused, but 

 with lateral marginal notches indicating their original division ; 

 the distal article is narrowly triangulate with slightly concave 

 lateral margins and acuminate apex. 



The female belt is seven-segmented, more widely oval. 



References : Cancer coronatus, Molina, J. I., Saggio sulla Storia 

 del Naturale del Chili, 1782, p. 207 ; French translation, by 



Gruvel, , 1789, p. 183 ; English translation. Hist, of Chili, 



by English editor, London, 1809, vol. I, p. 170 ; an anony- 

 mous compendium of History of Chili, was published in 

 Bologna, 1776. 



Cancer irroratus, Bell, T., Proc. Zool. Soc. London, 1835, vol. 

 in, p. 87 ; Trans. Zool. Soc. London, 1835, vol. I, p. 340, pis. 

 46, 47, figs. 6, 7.— Heller, C, Reise "Novara" Zool., 1865, 

 Bd. II, p. 6.— Lenz, H., Zool. Jahrb. Suppl. V, Bd. II, 1902, 

 p. 759. 



Cancer plebejus, Poeppig, E., Archiv. f. Naturg., 1836, Bd. II, 

 pt. I, p. 134. — KiNAHAN, J. R., Joum. Royal Soc. Dublin, 

 1857, vol. I, p. 335. — MiERS, E. J., Proc. Zool. Soc. London, 

 1881, p. 67.— Ortmann, A. E., Zool. Jahrb. Syst. 1893, Bd. 

 VII, p. 425.— Rathbun, M. J., Proc. U. S. Nat. Mus., 1898, 

 vol. XXI, p. 581 ; loc. cit. 1910, vol. XXXVIII, p. 539, pi. 38, 

 fig. 1 ; Bull. 152, U. S. Nat. Mus., 1930, p. 198, pis. 81, 82, fig. 

 1, pi. 85, fig. 3. 



Platycarcinus irroratus, MiLNE Edwards, H., et Lucas, P. H., in 

 d'Orbigny's, A. Voy. I'Amer. Meridionale, 1844, t. VI, pt. I, 

 p. 19. — NicoLET, H., in Gay, C, Hist, fisica y polit. de Chile, 

 Paris et Santiago, 1843-71, Zool., t. Ill, 1849, p. 142. 



