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THE VOYAGE OF H.M.S. CHALLENGER. 
the generic name proposed by Eydoux and Souleyet for the small-eyed Squillce. The 
genus Coronidci will therefore include the Stomatopods which have the dactyli of the 
raptorial claw dilated at the base and armed with spines on the inner margin, and the 
hind body depressed ; while the genus Gonodactylus, as thus restricted by the removal 
of the Protosquillce and the Coronidce, will include only the species which have the 
hind body convex, the dactylus of the raptorial claw dilated at the base and unarmed, and 
the telson distinct and movable. 
In the genus Gonodactylus as thus restricted the terminal joint of the first 
abdominal somite of the male is imperfectly divided, by a marginal notch, into an outer 
and an inner lobe, which are not separated by a suture (see PL XV. fig. 8). 
The fixed limb of the petasma is short, and ends in a single acute hook, while the 
movable limb is abruptly bent outwards near its base. 
Gonodactylus chiragra, Latreille (PL XV. fig. 4). 
This common and widely distributed species is represented in the Challenger collection 
by numerous males and females from St. Thomas, one male from Bermuda, one male 
from Station 36, near Bermuda (32° 7' 25" N., 65° 4' W.), by two specimens from 
Samboangan, and one specimen from Samboangan Bank, besides numerous adult male and 
female specimens of a closely related but minute variety from near Cape St. Roque. The 
appendages of the exposed thoracic limbs of all the specimens of Gonodactylus chiragra 
are slightly flattened, and twice as wide as thick, and their edges are parallel and not 
dilated at the tip. The second joint of the exopodite of the uropod is more than twice as 
long as the paddle, and it carries about eleven (ten in four specimens, eleven in seven 
specimens, nine or ten in Heller’s specimen from Nicobars, twelve in two specimens) 
movable spines and one terminal ventral immovable spine. 
The terminal joint of the endopodite of the male Gonodactylus chiragra is divided 
by a deep marginal notch into an outer lobe (Pl. XV. fig. 4 ) a and an inner one b, 
which is not separated from the outer one by a suture. The fixed limb of the petasma e 
is short, swollen at the base, and bent inwards at right angles at the tip, thus forming a 
hook which ends in an acute point. The much longer movable limb f is bent outwards 
in a prominent sharply defined obtuse angle near its base. 
There seems to be no room for doubting that the specimens from various parts of the 
ocean which have been described as Gonodactylus chiragra really belong to one species, 
and that it is very widely distributed throughout the Atlantic, the Pacific, and the Indian 
Oceans. E. v. Martens says 1 that although he has formerly published his opinion that 
this species is confined to the Indian Ocean, and the Pacific from the Red Sea to Chili, the 
1 Ueber cutanische Crustaceen, nach den Sammlungen Dr. J. Gundlach’s, Arcliiv f. Naturgesch., 1872, Jahrg. 
xxxiii., Bd. ii. p. 147. 
