NO. 1162. BRACHYURA COLLECTED BY THE ALBATROSS— RATH BUN. 597 



OVALIPES, new genus. 

 (From ovalis, oval, and j>e8, foot.) 



Platyoniehus Latreille, 1825, part, not Platyonichus Latreille, 1818. Type, 

 riatyonichus oceUatm (Herbst) Latreille. 



In 1897,^ I showed that Platyonichus (L«atreille, 1818) is synonymous 

 with Portumnus (Leach, 1814), both having as type the species Cancer 

 latipes Pennant. At the same time I suggested that Xaiva (Mac Leay, 

 1838) coukl be used for the species ocellatus and hipustulatus, wliich for 

 many years have been included in or have represented the genus 

 Platyonichus. It has since been brought to my attention that the type 

 of Xaiva, X. imlcheUa Mac Leay, is more nearly related to Portumnus 

 than it is to the species ocellatus and hipustulatus. For these last, 

 therefore, I am obliged to propose a new name. Ovalipes differs from 

 Portumnus and Xaiva in having the last joint of the fifth pair of feet 

 broadly oval, rounded at the extremity, instead of lanceolate and acute; 

 the basal joint of the antenuuhe advanced and visible in a dorsal view 

 between the frontal teeth; the chelipeds elongate; the abdomen of the 

 male oblong instead of narrow triangular. 



98. OVALIPES BIPUSTULATUS (Milne-Edwards). 



Platyonichus hipustulatus Milne-Edwauds, Hist. Nat. Crust., 1834, I, p. 4.37, pi. 

 XVII, figs. 7-10. 



Tome, Chile; Lota, Chile. 



99. CCENOPHTHALMUS TRIDENTATUS A. Milne-Edwards. 



CamopJithalmus tridcntatus A. Mii.ne-Edwakds, Crust. Roj;-. M«3x., 1879, ]). 237, 

 pi. XLii, fig. 2 {Ctenophthalmus) . 



Off the Rio de la Plata, 10^-11^ fathoms, stations 2764, 2705, 2766. 



ACANTnOCYCLID.l^. 



Genus ACANTHOC YCLUS. 



A study of the specimens of Acanthocyclus in the U. S. National 

 Museum, collected by the Albatross and others, and in the Museum of 

 Comparative Zoology, indicates that there are three distinct species on 

 the west coast of South America. The first species and type of the 

 genus is A. (jayi Milne-Edwards and Lucas, 1843. The existence of a 

 second species was first recognized by Strahl in 1802, who unluckily 

 applied to it the name A. gayi, giving to the form which is the true 

 gayi a new name, A. villosus, which therefore becomes a synonym. The 

 second species — that is, the A. gayi of Strahl — was later taken by the 

 Magenta on the west coast of Patagonia, and again named ''A. //ay" by 

 Targioni-Tozzetti. 



' Proc. Biol. See. Washington, XI, p. 158. 



