612 



of the body, last joint of the peduncle shorter than the penultimate one. 

 Anterior gnathopoda with the propodos much narrower than the carpus and 

 scarcely tapering distally ; posterior ones comparatively less strong than in 

 1lic preceding species, otherwise of a very similar structure. Pereiopoda 

 likewise rather similar, except that the meral joint of the 2 anterior pairs 

 is somewhat less broad. Last pair of nropoda with the inner expansion of 

 the basal joint comparatively narrow, terminal joint very small. Body of a 

 uniform pale yellowish colour, without any pigmentary ornament. Length 

 of adult male scarcely attaining 5 mm. 



Re.warL-x. Though very nearly allied to the preceding species, this 

 form, in the living state, is at once distinguished by the absence of pigment, 

 and by the inperfectly developed eyes. It is also rather inferior in size. 



Occurrence. - Though nowhere in any abundance, this species would 

 seem to occur along the whole west coast of Norway, and extends northwards 

 to Hasvig, west Finmark. It is a true deep-water form, being only found 

 in greater depths from 50 to 150 fathoms, especially where the bottom con- 

 sists of sand and pebbles. In nearly all cases I have found it inhabiting old 

 shells of Dentalium, to the mouth of which are agglutinated fragments of 

 shells and pebbles. 



Out of Norway it has not yet been recorded. 



Gen. 3. Corophium, Latreille, 1807. 



Body comparatively stout and much depressed, with extremely small 



coxal plates, the 1st pair of which are conically produced, and tipped by a 



number of strong ciliated bristles. Cephalon rather broad, with the lateral 



lobes narrow, and more or less projecting between the insertions of the 



antennse. Urosome flattened, with the segments sometimes coalesced. Eyes 



small or imperfectly developed, placed at the base of the lateral lobes of the 



cephalon. Antennse rather unequal, the superior ones slender, without any 



accessory appendage, but with the flagellnm well developed and multiarticulate ; 



inferior ones strong, pediform and, as a rule, much more powerful in male than 



in female, Avith the penultimate joint of the peduncle large and produced at the 



end posteriorly to a more or less strong spiniform projection, flagellum short, 



^-articulate, and terminating in several small hooks. Anterior lip large 



and broad; posterior lip with the inner lobes well denned. Mandibles nor 



' developed, but with the palp small and narrow, composed of 2 joints 



eacb carrying a strong, ciliated seta. First pair of maxillae with the 



