56 THE VOYAGE OF H.M.S. CHALLENGER. 



the generic name proposed by Eydoux and Souleyet for the small-eyed Squillce. The 

 genus Coronida 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 ; whUe 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 dUated 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 PI. 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 (PI. 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. Eoque. 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 h, 

 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 ^ 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 Ueter cubanisolie Cruetaceen, nach den Sammlungen Dr. J. Gundlach's, Archiv f. Naturgesch., 1872, Jahrg. 

 xxxiii., Bd. ii. p. 147. 



