612 



of the bodj'^, last joint of the peduncle shorter than the ]ienultimate one. 

 Anterior gnathopoda with tlie propodos mncli narrower than the car])us and 

 scarcely tapering distally; posterior ones comparatively less strong tlian in 

 the 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 

 nniform pale yellowish colour, withont any pigmentary ornament. Length 

 of adult male scarcely attaining 5 mm. 



I'lwnrJiS. — 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 ej'es. It is also ratlier inferior in size. 



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

 seem to occnr 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 loO 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 moutli of which are agglutinated fragments of 

 shells and pebl)les. 



Out of Norway it has not yet been recorded. 



Gen. 3. Corophium, Latreille, 1807. 



Body comparatively stont and nmch depressed, with extremely small 

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

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

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

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

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

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

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

 inferior ones strong, pediform and, as a rule, much more powei'fnl in male than 

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

 end posteriorly to a more or less sti'ong spiniform projection, flagellum short, 

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

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

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

 only, each carrying a strong, ciliated seta. First pair of niaxillse with the 



