210 Mr. EK. J. Miers on Crustacea from 
to the base of the gastric prominence; the intervening parts 
of the carapace are nearly smooth ; the antero-lateral, lateral, 
and posterior margins of the carapace are thin, sharp-edged, 
and somewhat obscurely crenulated. Asin Heterocrypta granu- 
lata, there is a distinct more or less granulated ridge on the 
pterygostomian regions; the postabdomen in both sexes has 
six joints distinct. The short thick eyes fit closely into the 
orbits, which have a scarcely distinguishable closed fissure in 
their upper margins ; the longitudinally-folded antennules are 
widely separated from the antennee, whose basal joint occupies 
the inner orbital hiatus and whose short flagellum is scarcely 
visible from above in a dorsal view; the ischium joint of the 
outer maxillipedes is broad, nearly oblong, excavated at its 
distal end to receive the merus, which is nearly quadrate, not 
notched at its antero-internal angle, where it is articulated 
with the next joint; the exognath is narrow, and about reaches 
to the distal end of the merus. Chelipedes slender and some- 
what elongated; merus or arm trigonous, with the three faces 
smooth, the margins with little-prominent crenulations or 
teeth, which are themselves minutely denticulated ; wrist with 
three crenulated and minutely denticulated ridges; palm 
longer than the arm, trigonous, its upper surface smooth, the 
margins dentated, the teeth themselves granulated or denticu- 
lated and very small, except on the inner margin, where they 
average about ten in number; fingers small, acute at apices, 
and distinctly toothed on their inner margins. Ambulatory 
legs slender, smooth, with the joints compressed and usually 
unarmed; the merus joints of the first ambulatory legs, 
however, are sometimes minutely denticulated. 
Colour (in spirit) yellowish white, pinkish, or slaty. 
Length of the largest male 5 lines (nearly 11 millim.) ; breadth 
nearly 6 lines (12 millim.); length of chelipede when ex- 
tended as far as its conformation will allow 10$ lines (22 
millim.). 
The description is taken from an adult male. Most of the 
females bear ova. 
It is at once distinguished from its congeners, Heterocrypta 
granulata, Stimpson, and H. macrobrachia, Stimpson *, from 
the American seas, by the different form of the carapace, 
which in outline more nearly resembles that of certain species 
of Cryptopodia (e. g. C. concava). 
It is certainly one of the most interesting species in the 
collection ; and I have much pleasure in dedicating it to Baron 
Hermann-Maltzam, its discoverer. 
* Ann. Lye. Nat. Hist. New York, x. p. 105 (1871). 
