CRUSTACEA. 
79 
From the soft clay that adhered to the carapace, I suspect that this species has the same burrowing 
habits as the Gelasimi. 
The specimens were taken at Oahu, Sandwich Isles. 
Plate XXIV.* Fig. 1. Gelasimus telescopicus, mas. 
1 a. Antenna media, aucta . 
1 b. Antenna lateralis, aucta . 
1 c. Pedipalpus externus, aucta . 
1 d. Cauda mavis. 
1 e. Cauda femince. 
If Chela sinistra femince . 
3. Gelasimus minor, n. s. 
Gel. clypeo convexo, Icevi, lateribus inermibus ; chela dextra majore, pollice lonyiore, dentibus quinque armato. 
Long, clypei, lin. 5 ; lat. lin. 7. 
Color clypei ferruginous, chelarum aurantius. 
The carapace is smooth, convex, broader in front than behind; the anterior margin is sinuate, 
canaliculate, with a depressed rostrum, grooved along the middle, whose base is one fifth the breadth 
of the anterior margin ; the anterior angles are slightly produced. The middle of the carapace has 
linear impressions in the form of the letter H ; slightly elevated lines mark out the branchial regions. 
The ophthalmic peduncles extend to the angles of the shell ; the grooves in which they lie have 
finely crenate margins. 
The right chela, as in the rest of the genus, is disproportionately large : the humerus is very 
small ; the ulna enlarged, trihedral, crenate at the inferior angle, with a single tooth at the inner angle ; 
the manus is minutely granulate like shagreen, convex externally, with an elevated line of granules 
along the superior and inferior borders ; sinuate internally, and bearing on this aspect two trans- 
verse rows of small tubercles, near the base of the thumb. The fingers when closed leave a consi- 
derable interspace, and the pollex overlaps the digitus; the latter has an elevated tooth near the 
extremity, and six or seven near the base ; the pollex is more bent especially at the extremity, it has 
an elevated tooth one third of the way from the apex, and three or four near the base. These parti- 
culars are constant in three specimens which I have examined. The digits of the smaller chela are 
spatulate, and hirsute at their extremities, as in Gelasimus Duperreyi, (Zoologie de la Coquille, Atlas, 
Crustaces, pi. 1. fig. 2. 2a,) to which this species has considerable affinity, but from which it differs in 
having the carapace larger in the transverse than in the longitudinal diameter, and more convex 
than is represented in the figure quoted. The breadth of the rostrum also, which in Gel. minor 
equals one fifth of the breadth of the anterior margin, in Gel. Duperreyi scarcely equals one eighth ; 
and the ophthalmic peduncles are consequently shorter in our species. The fingers of the great chela 
differ in their proportions, the digitus being shorter and more obtuse. From Gelasimus affinis, of which 
part of the chela only is represented ( loco cit. pi. 1. fig. 3.), our species also differs in the projecting 
teeth along the concave margin of the pollex. 
Of the claws the fourth pair are the longest; the femora are compressed, and notched at the 
superior margin, near the apex ; the last joints are very slender, and slightly curved. 
The specimens are all males, and were taken at Oahu, Sandwich Isles. 
Plate XXIV. Fig. 2. Gelasimus minor, mas. 
2 a. Chela dextra. 
* The specimens of Natural History collected in this voyage, and deposited in the Museum of the Royal College of 
Surgeons, have been figured for this work by permission of the Board of Curators. 
