BRACHYURA AND MACRURA OF HAWAIIAN ISLANDS. 867 
Polydeclus villosus Dana, Crust. U. S. Expl. Exped., I, 227, 1852; pi. xm, figs. 3 a-e, 1855. Raraka 
Island, Paumotu Group. 
Polydectus cupulifer Richters, Beitr. Meeresf. Mauritius u. d. Seychellen, p. 149, pi. xv, figs. 17-20, 
pi. xvi, figs. 1-8, 1880. Fouquets, Mauritius. 
Record of specimens. — Hilo, Hawaii, H. W. Henshaw, 2 males, 3 females. “They occur under 
stones in 2 or 3 feet of water in a little inlet where the tide continually flows and ebbs. They are by 
no means rare there, though one has to turn over a number of big stones or coral blocks to find one 
crab.” Vicinity of Laysan, 10 fathoms, station 3959, 1 male. 
Three of the specimens hold an actinian in each hand; two specimens, the smallest of all, have 
an actinian in one hand, not in the other; the sixth specimen lacks the right cheliped altogether, but 
the left grasps an actinian. These anemones are variable in size. A crab of good size, about 15 mm. 
in width (devoid of hair) has in one hand an anemone about 10 mm. in diameter, in the other one 
not more than 6 mm. in diameter. The anemones are firmly grasped by the chelae, the sharp pre- 
hensile spines digging into the flesh; usually the fingers are spread so as to seize opposite sides of the 
anemone, but in the case of the large one above mentioned the fingers of the crab are flexed and nip 
into a small bit of the anemone. Compare Richters’ s description and figures. 
Family P0RTUNID£. 
Carcinides maenas (Linmeus). 
Hawaiian Islands, 1 male, in U. S. National Museum, recorded by Streets. (See Streets, Bull. 
U. S. Nat. Mus., No. 7, 1877, 109; and Alcock, Jour. Asiat. Soc. Bengal, LXVIII, 1899, 14.) 
Parathranites hexagonum, sp. nov. 
(PI. xii, fig. 3.) 
Carapace broad-hexagonal. 
Length about four-fifths of width exclusive of spines. Surface strongly areolated, granulated, 
the granules coarser on the elevated portions; seven high conical tubercles, one on each protogastric 
area, one posterior mesogastric and in same line one at inner branchial angle, two 
cardiac side by side. Of smaller tubercles there is one posterior cardiac and three 
posterior branchial, which form a longitudinal curve with the protogastric and 
anterior branchial tubercles. 
Front four-toothed, teeth subtriangular, blunt, median pair a little more ad- 
vanced, median sinus V form, lateral sinuses U form. No tooth at inner angle of 
orbit. Upper margin of orbit with two open fissures. 
Antero-lateral projections, 6; first or orbital narrow, blunt, resembling those 
of the median frontal pair, and separated by a shallow sinus from the second, 
which is low and very blunt. Next three regularly dentiform, the third sub- 
acutely pointed, the fourth with acuminate tip, fifth with even more slender tip. 
Sixth projection a spine about twice as long as preceding tooth. Extremities of posterior margin 
armed with a long upcurved spine. 
A blunt tooth at lower inner angle of orbit, more advanced than the front; outer sinus a large V. 
Orbit about two-thirds as wide as the front. Ante rinse and maxillipeds much as in P. orientalis 
(Miers). 
Chelipeds one and two-thirds as long as carapace. A subdistal spinule on anterior border of 
ischium. A strong spine at middle of same border of merus and a spine near distal end of outer 
border. Spine at inner angle of wrist half as long as palm; a smaller spine at outer angle, and on 
outer surface five or six blunt spinules. Upper surface of hand with two strong costae and three spines, 
of which the inner distal is strongest, distal spine of outer border subterminal. Two indistinct ridges 
along the inner and the outer surface of the hand. Fingers as long as palm. 
Of the first three pairs of legs only the last remain; they are one and two-thirds as long as 
carapace. Natatory legs unarmed, merus slender. 
Second and third segments of abdomen of male strongly carinated; sixth much broader than long, 
sides slightly converging. 
Fig. 25.— Parathra- 
nites hexagonum , 
abdomen of type 
male, x 2jf. 
