26 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



an error, as in his figure (unpublished) the carapace measures 13.5 

 mm. long b}^ 15.5 mm. broad; the figure is enlarged twice, making 

 the actual measurements 6.75 nun. ])y 7.75 mm., or 0.26 l\y 0.8 inch. 



PORTUNUS PELAGICUS (Linnaeus). 



Cancer pelagicns Linn.eus, Syst. Nat., lOtli ed., I, 175H, p. 626. 

 Portunus pelugicns Fabkicius, Suppl. Fiiit. Syst., 1798, p. 367. 

 Neptunus pelaglcus Alcock, Jour. Asiatic Soo. Bengal, LXVII, 1898, p. 34, part; 

 not all references to synonymy. 



Kawatana; 1 male, 1 female. 



PORTUNUS TRITUBERCULATUS (Miers). 



Portunus {Neptunus) pdagmis de IIaan, Fauna Japon., Crust., 1835, j). 37, pis. 



IX and X. 

 Neptunus tntubercukdus Miers, Ann. Mag. Nat. Hist. (4), XVII, 187(i, p. 22], 



and (5), V, 1880, p. 238. 

 Neptunus {Neptunus) pelagicas var. triluheradatus Ortmann, Zool. Jalirl)., Syst. 



VII, 1893, p. 74. 



Wakanoura, Kii, 1 female; Yokohama, 1 male, 1 female, and Hako- 

 date, 1 female, V . S. Fish Connnission steamer Alhafross; Japan, 8 

 males, 2 females. 



This form seems to me specifically distinct from P. j>elagicut<^ of 

 which 82 specimens have been examined. In 2\ trittiherculatax, the 

 granules of the carapace are much finer and more numerous. There 

 is a very prominent lump on the postgastric and two on the cardiac 

 region. The front has only two teeth between the inner orbital teeth, 

 the two small teeth at the base of the epistomial spine being absent. 

 Th<' middle lobe of the supraorliital l)order is rounded, not dentiform 

 nor spiniform. The anterior margin of the arm carries 4 (in one case 

 8) spines. The length of the sixth abdominal somite in the male is 

 greater than its proximal width; in P. pektgica.'^ less, or just equal to 

 that width. The sternum of the female is coarsely granulate; carinse 

 of second and third abdominal segments laterally strongly produced 

 in an acute tooth or spine. 



PORTUNUS GLADIATOR Fabricius. 



Portunus gladiator Fabricius, Suppl. Ent. Syst., 1798, p. 368. 

 Neptunus {Amph'drite) gladiator Alc(K'k, Jour. Asiatic Soc. Bengal, LXVIII, 

 1899, p. 35, and synonymy. 



Wakanoura, Kii; 1 male, 1 female. 



Aiii2>h!trite media Stimpson, as figured b}- him in his unpublished 

 report on the Crustacea of the North Pacific Exploring Expedition, 

 difl'ers from P. (jhidlntoi' in the nearly equal and ecpially advanced 

 teeth of the front, the appressed and overlapping antero-lateral teeth, 

 the shorter lateral spine. 



