112 ATJSTBALIAN MALACOSTBACA. 



naked ridges on its upper surface, but without numerous 

 tubercles. Merus joints of the ambulatory legs with a series of 

 spines on their upper margins. Male genital appendages of the 

 first pair not twisted, with a terminal claw.) [M.~] 



206. Leioloplius planissimus. 



Cancer planissimus, tterbst, Krabben u. Krebse, iii., pi. lix., 

 fig. 3 (1804). 



Plagusia serripes, Lam., Hist. An. sans Vert., p. 247 (1818). 



Plagusia clavimana, Desm., Consid. Crust., p. 127, pi. xiv. 

 fig 2 '(1825) ; M.-Edw., Hist. Nat. Crust., ii., p. 92 (1837) ; 

 Atlas in Cuv. E. A., pi xxiii., fig. 3. 



Acanthopus planissimus, De Haan, Faun. Japon., Crust., p. 30 

 (1835) ; Dana, U.S. Explor. Exped. xiii., Crust., ii., p. 372 

 (1852) ; M.-Edw., Ann. Sci. Nat. (ser. 3), Zool. xx. ; p. 180 

 (1853). 



Acanthopus Gibbesi, M.-Edw., Ann. Sci. Nat., t. c, p. 180 

 (1853). 



Leiolophus planissimus, Miers, Cat. Crust., N.Z., p. 46 (1876); 

 Ann. and Mag. Nat. Hist., 1878, p. 153. 



Hands in the male strong ; the palms compressed and consid- 

 erably dilated, much broader than the wrist, not sulcated on their 

 upper margins. Greatest width of the abdomen of the male 

 exceeding its length to the base of the last segment. [_2f.] 



Torres Straits. Widely districuted in tropical seas. 



Family III. PINNOTKBBIDM. 



Carapace obese or depressed, rounded on the sides, of soft 

 consistency. Eyes very short, imbedded in the orbits. Buccal 

 organs very variable. Margin of the efferent branchial channel 

 partly defined by a ridge on the palate. Abdomen of the male 

 narrow, toward the base much narrower than the adjacent part 

 of ' the sternum. Legs usually small, weak. [D.] 



Sub-Family PinnotherineB. 



Usually obese, sometimes depressed. Second joint of the 

 external maxillipedes small or obsolete. [Z).] 



