872 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Charybdis japonica (A. Milne Edwards). 
(PI. xm, fig. 2.) 
Portunus ( Charybdis ) 6-dentatusde Haan, Fauna Japon., Crust., 41, pi. xxi, fig. 1, 1835. Not Cancer 
sexdentatus Herbst. 
Goniosoma japonicum A. Milne Edwards, Arch. Mus. Hist. Nat. Paris, X, 1861, 373. 
Charybdis japonica Rathbun, Proc. U. S. Nat. Mus., XXVI, 1902, 27. 
Honolulu, U. S. S. Tuscarora, 2 females. Honolulu, collector unknown, 1 male, 1 female. 
This species is, I think, the one described and figured by de Man (Jour. Linn. Soc. London, 
XXII, 1888, 80, pi. v, fig. 2) as Goniosoma affine Dana, but it differs from the true Charybdis affinis of 
Dana in the following characters: 
C. affinis is wider across front and orbits; front less advanced and less arcuate; side teeth a little 
concave on their outer slope, making them appear narrower. In affinis the merus of swimming feet is 
nearly as broad as long, while in japonica it is one and a half times as long as broad. Penult segment 
of male abdomen with sides more convex in affinis, so that the segment is widest at its middle, while 
in japonica it is widest at proximal end. 
There are in the Museum of Comparative Zoology specimens of C. affinis from Singapore and 
Penang, collected by Capt. W. H. A. Putnam. 
The Charybdis affinis of Alcock (Jour. Asiat. Soc. Bengal, LXVIII, 1899, 56) must be a different 
species, as it has a transverse ridge on the cardiac region, contradictory to the descriptions by Dana 
and de Man. 
The species grows to be quite as large as C. cruciata; and it may be noted that one of the conspic- 
uous differences between these two lies in the merus of the last pair of legs, which in C. cruciata is 
shorter or three-fourths as broad as long (not three-fourths as long as broad) and in C. japonica two- 
thirds as broad as long. 
Charybdis erythrodactyla (Lamarck, 1818). 
(PI. IV.) 
Thalamita pulchra Randall, Jour. Acad. Nat. Sci. Phila., VIII, 1839 (1840), 117, pi. iv. 
Goniosoma erythrodactylum A. Milne Edwards, Arch. Mus. Hist. Nat. Paris, X, 1861, 369, and 
synonymy. 
Puako Bay, Hawaii; Honolulu; Honolulu market; Oahu, H. Mann, 1864, in Museum of Compar- 
ative Zoology; Waiawa, Kauai, Valdemar Knudsen; Kauai, A. Garrett, in Museum of Comparative 
Zoology. 
Hawaiian Islands (Randall), 2 females, types of T. pulchra, Nuttall and Townsend, in Philadel- 
phia Academy of Natural Sciences; length of larger, measured to tips of frontal 
teeth, 161.5, width 188.8 mm. 
Honolulu (Lenz). 
Charybdis orientalis Dana. 
(PI. XIII, fig. 1.) 
Charybdis orientalis Dana, Proc. Acad. Nat. Sci. Phila., VI, 1852, 85; Crust. 
U. S. Expl. Exped., I, 285, 1852; pi. xvii, fig. 10, 1855. Not C. ( Goni- 
osoma ;) orientalis Alcock, Jour. Asiat. Soc. Bengal, LXVIII, 1899, 63. 
Carapace about two-thirds as long as broad; four series of transverse granular 
ridges, the posterior of which connects the last pair of side teeth; surface pilose 
except on the ridges and margins and two bare spots on the cardiac region. 
Front cut into 6 truncated teeth, not including the inner orbital angles. 
Antero-lateral borders with 5 large teeth, the last not larger than the others; a small denticle at 
outer base of first tooth. Posterior border arcuate and curving into the postero-lateral borders; below 
the marginal rim at either end of posterior border there is a smooth lobule. 
Major diameter of orbit less than one-fourth width of inter-orbital space, the lobe at lower inner 
angle dentiform, obtusangular, the lobe below the outer angle distinct, not dentiform. 
Arm with 3 spines on the anterior border and one on the posterior border; wrist with a strong 
spine at the inner angle, 3 small spines on the outer side; 5 large spines on upper surface of hand. 
Fig. 32 . — Charybdis ori- 
entalis, Honolulu, 
abdomen of male, 
X l 
