REPORT ON THE AMPHIPODA. 1115 



1884. Amphithoe, Blanc, Die Amph. dor Kieler Bucht, pp. 51, 77. 



1885. Amphithoe, Carus, Prodromus Fauna? Mediterraneaj, pars ii. p. 395. 



1886. Amphithoe, Gerstaecker, Bronn's Klassen und Ordnungen, Bd. v. Abth. ii. p. 496. 



1887. Awj'hiti"', Bonnier, Catal. Crust. Malac. Concarneau, p. 108. 

 1887. Amphithoe, Chevreux, Catal. Crust. Amph. Bretagne, p. 27. 



For the original definition of the genus, see Note on Leach, 1814 (p. 86). 

 Cymadusa, Savigny, was never defined, and has been identified by the figures. For the 

 definition of Pleonexes (and for that of Sunamphitoe), see Note on Spence Bate, 1857 

 (p. 294). Boeek's definition of the genus is practically included in that which he gives 

 for his subfamily Amphithoinae, from which I omit what has been already given in the 

 character of the family. 



" Lower Lip with the outer lobes deeply incised at the apex ; the inner lobes large. 



"Body compressed ; side-plates of moderate size, not plumose on the lower 1 margin ; 

 fifth pair as deep as the fourth and broader, incised on the hinder margin for the retro- 

 verted third perasopods. 



" Upper Antennas slender; third joint of the peduncle very short; flagellum long; 

 accessory flagellum absent. 2 



" Lower Antennas with very short flagellum. 



"First and Second Gnathopods with subcheliform hand; the hand of the first pair 

 of the same shape as that of the second ; the second pair stronger in the male than in the 

 female. 



" Third Perasopods retroverted. 



" Uropods biramous ; third pair with the rami little ; the outer ramus furnished with 

 two hooks (ungvibus)." 



For the genus itself he says : — 



"Mandibles with the third joint of the palp not very dilated, almost equalling the 

 length of the second joint. 



" First and Second Gnathopods with the finger dentate ; the second pair stronger 

 than the first." 



It may be observed that it is only the four terminal joints of the third perasopods 

 that are retroverted, and that the third joint of the mandibular palp sometimes even 

 exceeds the second in length. For the generic character of Sunamphithoe, Boeck says, 

 " Last three pairs of perasopods with the last [meaning the fifth, not the sixth] joint 

 dilated downwards and constituting a subcheliform hand ; other points almost as in 

 Amphithoe." 



1 Interiore is no doubt a misprint, copied from the earlier of Boeek's works into the later, mferiore being intended 

 as in the account of the Leptocheirina; and Photinae. 



3 It is this character which separates Amphithoe from Grubia, Czerniavski, and Amphithoides, Kossmann. 



