876 
BULLETIN OP THE UNITED STATES FISH COMMISSION. 
One egg-laden female of K. hendersoni was taken at station 3876, Auau Channel, 28 to 43 fathoms. 
It differs from a Samoan example in having the submedian lobes of front as advanced as the lateral 
pair; the granules which make up the rugae of the palm and also those on the fingers are more 
elevated and are plainly visible to the naked eye. 
PLATEPISTOMA, gen. nov. 
Epistome broad (from side to side), its posterior margin well defined and not overlapped by the 
outer maxillipeds. Merus of latter as broad as long, its antero-external angle produced. Buccal 
cavity widening anteriorly. 
Carapace suborbicular, margins spinous. Eyestalks very stout, filling the orbits. Basal joint of 
antenna longer than wide, filling the orbital hiatus. 
In the well-defined buccal cavity in which the maxillipeds neatly fit, this genus is not a typical 
Cancrid, and approaches the Pilumnidse; the genus Telmessm is perhaps nearest of the Cancridae; in 
all other respects it has the characteristic appearance of the family. In the form of the carapace it has 
much the aspect of Hypopeltarium; the basal joint of the antenna is not far removed from Atelecyclus. 
It is unfortunate that this new form should be represented in the collection by only a young 
specimen; but, although the adult may differ, it is obviously not possible to place the species in any 
known genus. 
Platepistoma macrophthalmum, sp. nov. 
Carapace slightly wider than long, suborbicular with a fairly well-marked lateral angle, moder- 
ately convex in both directions; regions indicated, surface uneven, pubescent and covered with sharp 
granules, with longer spinules on the summits of the areolae. 
Frontappearingtridentate; the median tooth small, 
triangular, bent down to the interantennular septum; 
the lateral teeth are shallow lobes formed by upper mar- 
gin of antennulary fossettes. 
Orbits shallow, large, a little wider than high and 
completely filled by the eyes; upper margin spinulous 
and cut by two small V-shaped notches. 
Antero-lateral and postero-lateral margins subequal, 
the former convex and cut into five large, alternating 
with four small, spines, the spines broad at base and 
slender pointed. On the straight postero-lateral mar- 
gin there is a spine of medium size, next the lateral 
angle, followed by several spinules. 
Lower orbital margin with a small round sinus not 
far from its middle; inner angle tipped with a spinule, 
but slightly more advanced than outer angle. 
Basal segment of antennules large, suboblong, taper- 
ing distally. The same segment of antennae is long, 
reaching for half its length beyond the lower orbital 
angle and meeting the upper orbital angle, sides subparallel, concave inner margin forming external 
boundary of antennular cavity. Movable part of antennae half as long as carapace. Epistome short, 
posterior margin notched behind middle of antennules. 
The buccal cavity widens perceptibly anteriorly. Maxillipeds not at all pediform. Merus wider 
than ischium, wider than long, antero-external angle much produced laterally and rounded ; anterior 
margin transverse. Exognath surpassing in length the endognath. 
Chelipeds equal and of moderate size, much as in Telmessus; spinulous, spinules arranged in longi- 
tudinal series on the palm, and largest on upper surface. Fingers furrowed, dentate on inner edges 
and fitting together when closed. 
Legs of moderate size, merus and carpus joints minutely spinulous above, with a longer terminal 
spinule. Horny nail very long and slender, occupying nearly one-third of dactylus. The whole 
animal is covered with a pubescence, which must be removed in order to see the spinulation and 
granulation. 
Fig. 33. — Platepistoma macrophthalmum, type female. 
a, Dorsal view, x 3J. b, Antennal and buccal area, 
X 10. c, Chela, x 9f. 
