414 EEV. T. E. E. STEBBING ON AMPHIPODA FEOM 



Length. " Four lines," about 8 mm. (Dana) ; 5 mm. (Saghalien specimens). Dana 

 prefixes " Eemale ? " to his description ; but, in my opinion, his description and figures 

 refer to the male. 



Hah. New South Wales, from shallow pools of w^ater along shores of Port Jackson 

 {Dana) ; Saghalien, 49° 30' N., 142° 8' E, {Andrea, specimens belonging to the Copen- 

 hagen Museum). 



Earn. PHLIADID^. 



Antennae short, first pair without accessory flagellum. Upper lip with distal margin 

 undivided. Lower lip without inner lobes. Mandibles without palp. Eirst maxillfe 

 with the palp obsolete. Gnathopods simple or only feebly subchelate. Pleopods with 

 the peduncles laterally produced in one or more of the pairs. Third uropods not 

 biramous. Telson entire. 



( Palp of the maxillipeds three-jointed, 2. 

 ( Palp of the maxillipeds four-jointed, 3. 



r Second uropods with two rami PA/zf/.s Giirriu, 1836. 



Second uropods with one ramus Pereionotus Bate and Westwood, 1862. 



f Third pleopods with rudimentary inner ramus. . . . Iphiplateia n. "■ 



{; 



L Third pleopods with well-developed inner ramus, 4. 



st four pairs of side-plates very deep Iphinotus, u. g. 



st four pairs of side-plates very shallow JSircmwa Chilton, 188 1. 



The genus Iphigeiiia, G. M. Thomson, is represented as having a three-jointed palp to 

 the maxillipeds, but in other respects its resemblance is so close to Iphinotus that its 

 right to stand as a separate genus awaits confirmation. 



All the genera of this family have representatives in the Southern Ocean ; but 

 Pereionotus pertains also to English and Mediterranean waters, acd Phlias to the 

 Mediterranean. 



Iphiplateia, n. g. 



Body much depressed, pleon strongly flexed. Head immersed between the projecting 

 side-plates, square, feebly rostrate, with the eyes on the prominent front corners. First 

 four pairs of side-plates very large, outspread. Antennae short, subequal in length, the 

 first the broader, the second attached on the under surface of the head, some way to the 

 rear of the first. Upper lip with entire convex distal margin. Mandibles without palp. 

 Lower lip without inner lobes. First maxillae without inner plate ; jJalp obsolete, but the 

 position for it marked ; apical teeth of outer plate five in number. Second maxillae with 

 the small outer plate continuous with the base, the inner broader. Maxillipeds with 

 palp extending beyond the outer plate ; the fourth joint small, not unguiform. First 

 and second gnathopods simple. Third, fourth, and fifth peraeopods with widely- 

 expanded second joint, and the fourth joint broad. Second and third pleopods with 

 lateral expansion of the peduncle, the third with rudimentary inner ramus. First and 



