677 



with the lateral corners slightly produced. Anterior pairs of coxal plates 

 scarcely deeper than the corresponding segments, and of a shape similar to 

 that in the preceding species. Last pair of epimeral plates of metasome 

 acutely produced at the lateral corners. Urosome of moilerate size. Eyes 

 oblong oval in form and exceedingly large, nearly occupying the entire lateral 

 faces of the cephalon, visual elements, however, imperfectly developed, pig- 

 ment light reddish brown, and slightly areolated. Superior antennae rather 

 large, nearly equalling in length the cephalon and the 4 anterior segments 

 of mesosome combined, joints of the peduncle successively diminishing in size, 

 flagellum scarcely as long as the peduncle, and composed of 4 articxilations 

 only; accessory appendage small, biarticulate. Inferior antennae with the 

 flagellum about half as long as the peduncle, and 4-articulate. Gnathopoda 

 and pereiopoda nearly as in A. microps. Last pair of uropoda with the outer 

 ramus much longer than the inner, which latter is minutely serrulated on the 

 inner edge. Telson comparatively small, about as broad as it is long, cleft 

 narrow and extending beyond the middle, terminal lobes truncated at the tip, 

 and each provided with a very small apical denticle. Colour light yellowish. 

 Length of adult male scarcely attaining 3 mm. 



JRemarJcs. — This diminutive form is well distinguishable from any of 

 the other species by its unusually large eyes, which in the living animal 

 appear pretty well defined, though devoid of any distinctly developed visual 

 elements. In the structure of the several appendages, it agrees very nearly 

 with A. microps. 



Occurrence. — Two or three specimens of this form were collected in 

 the Trondhjemsfjord, at Rodbjerget, from the considerable depth of 300—400 

 fathoms. 



Page 50. Add another genus : — 



Gen. Perrierella, Chevreux & Bouvier 1892, 



Syn. : Lysianassa, Sp. Bate (part). 

 > Aristias, Meinert (part). 

 » Pararistias, Robertson. 



Form of body about as in the genus Aristias. Antennae comparatively 

 short and of a structure similar to that in the said genus. Oral parts likewise 

 rather similar, though differing in the minor degree of prominence in the molar 

 expansion of the mandibles, in the greater equality of the lobes of the 2nd pair 

 of maxillae, and in the poor development of the palps of the maxillipeds, the 

 terminal joint of which is wholly wanting. Gnathopoda, pereiopoda and uro- 



