326 KEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



by Kroyer in bis specimens of M. Fabricu. Tbe legs in tbe small speci- 

 men figured are considerably" sborter tbau in larger specimens obtained 

 in 1S7S, and the flagellum of tbe antennulie consists in tbe small 6j)eci- 

 meus of a single segment, or witb traces of subdivision into two, ■U'bile 

 in tbe large specimens it is four -jointed, witb a rudimentary terminal 

 segment. 



Tbe body is in tbe female elongate oval, tapering posteriorly, and 

 broadest at tbe tbird tboracic segment, wbere tbe breadtb is equal to 

 about balf tbe lengtb. Tbe males are more slender, and are not dilated 

 bebind tbe bead. Tbe bead forms about one-fiftb of tbe total lengtb, and 

 is nearly twice as broad as long. Its anterior portion between tbe bases 

 of tbe antennuloe and antennae is comparatively narrow on its upper 

 surface, and is rounded or obtusely angled in front. Bebind tbe bases 

 of tbe antennulge it is suddenly mucb dilated at tbe sides, and a Uttle be- 

 bind tbe dilation are tbe prominent, strongly convex and laterally pro- 

 jecting eyes, immediately bebind wbicb tbe bead contracts suddenly in 

 widtb, and is then sligbtly rounded bebind. Tbe antennuloB arise in a 

 deep sinus on tbe antero-lateral region of tbe bead. Tbey consist of a 

 four-jointed peduncle followed by a four-jointed flagellum of about tbe 

 same lengtb as tbe peduncle. Tbe basal antennular segment is stout, 

 and subtrigonal in form ; tbe second is more slender and cylindrical, 

 wbile tbe tbird and fourtb are subequal, quite sbort and small, togetber 

 not over balf as long as tbe second segment, and sbould perbaps ratber 

 be regarded as flagellar segments. Tbe four flagellar segments are of a 

 bttle less diameter tban tbe last two peduncular segments, and are long 

 and cylindrical, tbe fourtb being tipped witb a rudimentary segment 

 bearing two strong terminal set?e. Tbe antennie are mucb larger and 

 stouter tban tbe anteunulae and are about two or tbree times as long as 

 tbe body. Tbey are com^^osed of a five-jointed peduncle and a. slender 

 multiarticulate flagellum. Tbey arise nearly in front of tbe antennulae 

 and tbeir first tbree segments are sbort and stout, not longer taken to- 

 getber tban tbe first two antennular segments. ' Tbe fourtb segment of 

 tbe antennae is only about balf tbe diameter of tbe first tbree segments, 

 but is greatly elongated, nearly or quite equaling in lengtb tbe bead 

 and tborax taken togetber, and is cylindrical, and provided witb a 

 few sbort setae, especially at tbe tip. Tbe fiftb, or last peduncular, 

 segment is sligbtly more slender and elongated tban tbe fourtb, and is 

 followed by a slender tapering flagellum composed of about seventy-five 

 segments, or, perbaps, in perfect specimens, of a greater number. Tbe 

 maxillipeds are large and broad, as required \)j tbe large bead, and are 

 furnisbed witb a five-jointed palpus, witb tbe basal segment sbort, tbe 

 second and tbird flattened and expanded internally, wbere tbey are also 

 ciliated ; tbe fourtb narrow ; tbe fiftb sbort, and botb i>ro vided witb scat- 

 tered setae, especially toward tbe tip. 



Tbe first tboracic segment is a little sborter tban tbe second, wbicb is 

 about equal in lengtb to tbe tbird and tbe fourtb ; tbe last tbree seg- 



