SYSTEMATIC ACCOUNT i6i 



The differences listed above appear sufficient to justify the removal of Nordenstam's E. tiibercidata 



from the species and to institute a new one, E. oculopetiolata, to receive it, together with similar 



specimens from the Discovery collections. 



Description. The antennule (Text-fig. ()d) is considerably longer and stouter than the antenna 



(cf. the published figures of E. tuberculata of Ohlin, 1901, pi. iii, figs. 10a, 2, where the antenna is 



much longer than the antennule). 



The first peduncular joint is slightly longer than the other two, which are of approximately equal 



length, the inner distal angle of the second joint is produced to form a well-marked projection. The 



clavate flagellar joint is slightly shorter than the third peduncular joint, and bears, in the male, a 



number of long sensory setae on its anterior margin. In the female these are fewer in number and are 



restricted to a small tuft at the distal extremity of the joint. 



Text-fig. 9. Edotta oculopetiolata sp.n. (a) Antenna, x 22. (6) Left maxilla, x 42. (c) Fifth pereiopod, x 15. ((/) Antennule, J, 

 X 22. (e) Left maxilla, x 42. (/) Head and first pereion segment, x 12. (g) First pereiopod, x 15. 



The antenna (Text-fig. ga) consists of a peduncle of five joints and a flagellum of two very short ones 

 (cf. Ohlin, 1901, p. 293 and pi. xxiii, fig. loaz, where the flagellum consists of three joints, the first 

 one of which is of considerable length). The first four peduncular joints are short and subequal, the 

 fifth is nearly twice as long as the fourth. The flagellum is extremely short; the distal joint is much 

 smaller than the basal one, and bears a tuft of long setae. 



The mandibles are described and figured by Nordenstam (1933, p. 95, fig- 22a, b). 



The outer lobe of the maxillula (Text-fig. ge) has ten spines on its obliquely truncated extremity, 

 and a few scattered setae both on its inner and outer borders. The distal extremity of the inner lobe 

 bears two strong, curved, sparsely plumose setae. The outer lobe of the maxilla (Text-fig. gb) bears 

 six long setae on its extremity, the middle lobe bears seven pectinate setae, and the innermost lobe has 

 its rounded distal end fringed with eleven plumose setae, of which the three innermost are much the 

 stronger and are curved inwards. 



The palp of the maxilliped (Text-fig. 5 a) is three jointed, the distal joint is broad and bears a fringe 

 of short setae on its outer margin (cf. Ohlin, 1901, for E. tuberculata, pi. xxiii, fig. lomxp, where setae 



