78 
CRUSTACEA. 
exterior to which is one smaller. Of the four teeth at the sides of the carapace, the two posterior are 
most pointed, and very small tubercles may be observed in the interspaces. 
The chela, or forceps claws, are of equal size, the carpus has a strong obtuse tooth on its inner 
aspect, and a sinuosity above; the manus is marked with four longitudinal and slightly punctuated 
furrows ; the digits are dentated, slightly hooked at the points, and of a very dark brown colour, which 
colour also extends a little way along the under part of the matins . The claws are moderately long and 
thick, hirsute at their margins and extremities, and gradually diminish in size to the last pair. 
The colour of this crab is greyish white, mottled with reddish brown or dull orange. 
The longitudinal furrows on the manus are omitted in Herbst’s description, but they appear in the 
figure; and the text reciprocally supplies an omission which occurs in the engraving, viz. of the hirsute 
character of the claws. 
The specimens, two in number, are males, and all that Herbst possessed were of the same sex. 
They were taken at Oahu, Sandwich Isles ; the native name is Kumimi. 
Section QUADRILATERA, Latr . 
Genus GELASIMUS, Latr. 
2 . Gelasimus telescopicus. n. S. 
Gel. oculorum pedunculis extra angulis clypei valde porrectis, lateribus clypei trispinosis, femoribus supra unispinosis. 
Long, clypei, lin. 8 ; lat, lin. 12. 
Color, ccesius. 
This is a singular and interesting Decapod. It is allied to Gonoplax (Leach, Malacostr. Podoph- 
thalm. Britannia, tab. 13.) in the form of the carapace, and unispinous character of the femora, but the 
pedipalpi and antenna accord with the generic characters of Gelasimus, Latr. ( Nouv . Diet. d’Hist. 
Nat. 12. p. 517.) In the proportionate length of its ophthalmic peduncles, however, it exceeds 
all other known Crabs: these are slender, endowed with free motion, and so produced as to extend 
beyond the angles of the shell by half their length. 
Of this species Mr. Lay had preserved two specimens, a male and a female, but in both unfortu- 
nately the right forceps claw was wanting. This circumstance precludes a satisfactory identity with the 
beckoning crabs; and at the same time with such a mutilation the formation of a new genus is scarcely 
warrantable merely on account of the length of the ophthalmic peduncles. 
The pedipalpi are approximated, but with a space intervening at their base ; in which circumstance, 
and in the form of the first joint of the mesial antenna, which is elongated and not transverse, this 
species deviates from the generic character of Macrophtlialmus, (Latreille, Cuv. Regne Anim. 4. p. 44, 
nouv. ed.) The second and third joints of the pedipalpi are large, flat, and unequally quadrilateral ; the 
fourth joint is inserted at the superior and external angle of the preceding. The lateral antenna are 
situated at the inner angles of the insertion of the ophthalmic peduncles ; they are four-articulate, with 
their last joint setaceous. The mesial antenna are smaller, and lie beneath the rostrum; their last 
joint is dark-coloured and bifid. The carapace is transversely quadrilateral, broader in front, smooth, 
slightly convex, with a narrow depressed rostrum which is grooved along the middle, and with three 
small spines at the anterior part of the sides of the shell. The eye-stalks are lodged in wide grooves, 
which have finely crenate edges. 
The left chela is small and compressed; the manus is carinate at the outer margin, as it lies in the 
prone state ; the fingers close with a small circular intervening space at the base ; they are pointed, and 
hirsute at the extremity. The claws are compressed, the fourth pair being the longest, then the third, 
the second and the fifth. The femora have each a small spine at the upper margin, near the distal 
extremity; the last joints are very slender, and finely pointed. 
