362 



Mandibles with tin' masti. -atory part <|iiite rudimentary, palp, however, rather 

 large, with tin- basal part narrow and prolonged, both rami Bub-terminal and 

 having tin- appearance of long falciform setae. Maxilla' with the masticatory 

 Inhr imperfectly developed, palp lamellar and edged with numerous slender plumose 

 BetfiB. Anterior maxillipeds somewhat resembling in structure those in the genus 

 /'-, mlnln-mlf/ii. Posterior maxillipeds very small, with the terminal joint imper- 

 fectly defined. Natatun legs of normal structure. Last pair of legs comparatively 

 small, hut with very long and slender marginal setae. 



l t 'i i/i'ii/^. This new genus is chiefly characterised hy the very prom- 

 inent hyaline rostral plate, and hy the structure of the antennae and oral parts. 

 thf latter especially being rather peculiar. It comprises as yet only a single 

 species to be described below. 







Eetinosomella nitidula, G. 0. Sars, n. sp. 



(Suppl. Pk 7). 



>)/.';//> Characters. Female. Body moderately slender and somewhat 

 cumpressed in its anterior parts, being of nearly equal width throughout. Surface 

 ..f hud\ remarkably smooth and shining. Cephalic segment large and deep, 

 considerably exceeding in length the 4 succeeding segments combined, rostral 

 plate prominent, very thin, narrow linguiform in shape, and slightly cur- 

 sed at the end. Epimeral plates of this and the 3 succeeding segments thin 

 and pellucid, including between them the oral parts and the bases ol' the nata- 

 tory legs. Urosome much shorter than the anterior division, and without any 

 -pimile- at the hind edges of the segments. Caudal rami rather far apart and 

 only slightly longer than they are broad, tip transversely truncated, apical setae 

 VTV slender. Anterior antennae comparatively narrow and densely clothed with 

 l.ri>tle- iii their outer part, basal joint occupying half the length of the antenna, 

 terminal part short, 3-articulate. Posterior antenna' with 7 rather unequal spini- 

 luini -eta issuing from the truncated end of the terminal joint, outer ramus 

 iicrlv exceeding the middle joint in length, and carrying "> comparatively short 

 set.i . .Maiidihular palp with the basal part long and narrow, carrying in front 

 .'{ curved seta\ both rami of a similar appearance, though a little unequal in length, 

 and issuing clove in "ether from the end of the l.a-al part, each consisting of a 

 narrow cylindrical scape split up at the end into L ; or :5 slender setae. Posterior 

 maxillipeds with .'{ slender apical seta 1 gradually increasing in length inwards. 

 Nataturv lei_'> with the rami subeipial in length, middle joint of inner ramus in 

 the -Jnd and .'Ird pairs provided inside with "2 seta' Last pair of legs with the 



