180 AUSTRALIAN MALACOSTBACA. 



336. Rhynchocinetes typus. 



Shynchoemetes typus, M.-Edw., Ann. Sci. Nat. (Ser 2), t. vii., 

 p. 165 (1837) ; Hist. Nat. Crust., ii, p. 383 (1837) ; Dana, "U.S. 

 Explor. Exped, Crust., i., p. 568, pi. xxxvi., fig. 7 (1852) ; Miers, 

 Cat. Crust., N.Z., p. 77 (1876). 



Carapace with, four spines, three upon the front margin, and 

 one in the middle line, behind the median marginal spine. 

 Rostrum very large, laterally compressed, upper margin with 

 two distinct teeth near its base, and seven or eight closely placed 

 teeth at the extremity, lower margin with about twenty large 

 teeth. External maxillipedes often longer than the rostrum, 

 tipped with spines. Anterior legs large, fingers short and rather 

 spoon-excavate, hairy above, wrist with a spine above. Tarsi 

 spinulous below. Length often nearly 4 in. [M.-M~\ 



Australia. Found also on the coasts of Chili and of New 

 Zealand. 



337. Rhynckocinetes rugulosus. 



Rhynchocinetes ruffulosus, Stimpson, Proc. Acad. Nat. Sci. 

 Phil., Vol. xii., sp. 440. 



Allied to S. typus, but with the surface of the carapace trans- 

 versely striolate or rugulose, the rugse more conspicuous and 

 thicker than in M. typus. Rostrum tridentate in the anterior 

 portion of the upper margin ; with twelve teeth below. Dactyli 

 of the first pair of feet naked above. Length 2 in. 



Port Jackson. 



G-enus Ceangon, Fabr. 



Carapace rather depressed, with the rostrum rudimentary. 

 Eyes short, thick, and free. Internal antennae dilated at the 

 base, at the outer side of which is a rather large scale ; their 

 peduncle short ; two multi- articulate flagella. Mandibles slender, 

 without palp. Pirst pair of legs strong, with a flattened hand, 

 the inner and distal angle of which is tooth-like, forming the 

 rudiment of a mobile finger. Following two pairs of legs 

 extremely slender, the second Usually terminating in very slender 

 didactyle chelae, and the third monodactyle. Remaining two 

 pairs of legs monodactyle, but stouter than the second and third. 



