REPORT ON THE AMPHIPODA. 743 



Family A M p H I L c H I D .E, G. 0. Sars, 1882. 



Boeck in 1876 constituted the Amphilochinae the second subfamily of the family 

 LeucothoidiB, assigning to it the genera Amphilochus, Gitana and Astyra; in 1882 Sars 

 changed the subfamily into a family, and added the new genus Stegoplax, which is near 

 to the earlier Cyproidia, Haswell, and the still earlier but somewhat obscure Peltocoxa, 

 Catta. Boeck's definition is as follows : — 



" Upper Lip much incised at the apex. 



" Mandibles strong, not uniform, apically dilated ; one mandible with, the other 

 without, an accessory plate (ramo interno) ; the molar tubercle more or less prominent ; 

 the j)alp three-jointed, elongate. 



" First Maxillee with the inner plate small ; the palp generally two-jointed, apically 

 armed with spines. 



" Second Maxillw with the outer plate a good deal narrower than the inner. 



" Maxillip>eds with the inner plates long, narrow ; the outer plates of moderate size or 

 small ; the palp more or less elongate ; its last joint unguiform. 



" The body tolerably deep, thick ; the side-plates large. 



" Upper Ante7ina3 short, the secondary flagellum absent or small, 



" First and Second Gnathopods generally of the same shape, either subchelate — some- 

 times powerful sometimes feeble — or scarcely subchelate. 



" First and Second Perseopods slender, filiform. 



" Last three pairs of Perwop>ods successively longer. 



" Urop)ods biramous ; the second jjair very short, the outer branch shorter than the 

 inner. 



" Telson whole or incised at the apex." 



Genus ^«i2^Moc^«s, Spence Bate, 1862. 



For the original definition see Note on Spence Bate, 1862 (p. 333). Boeck defines it 

 as follows : — 



" Mandibles with the third joint of the palp as long as the second or longer. 



" First Maxilla with the palp two-jointed ; the second joint broad at the apex. 



" First and Second Gnathojwds with large subchelate hands." 



Remark. — The name of this genus must not be confounded with Amphilocus, the 

 name of a genus of Coleoptera. 



Amphilochus marionis, n. sp. (PL XXXVIII.). 



Animal compact; first three segments of the pleon with the postero-lateral angles 

 nearly right angles, those of the third segment projecting when the following segments 



