-j^Qgg CRUSTACEA. 



duplo curvatce, setis prope basin plerumque duplo longioribus quam 

 articuli et numerosis, seta, articuli sexti (forsan quinti) longiore, setis 

 duabus posticis subapicalibus longis, subcequis, apicalibus brevibus, 

 anticd penultimd longiore quam articulus. Styli caudales perbreves ; 

 setis mediocribus, pared diffusis, secundis fere duplo longwribus. 



Front rounded. Cephalothorax obtuse behind, four posterior segments 

 subequal. Anterior antennae a little longer than the body, doubly 

 curved, setae short, towards base mostly twice as long as the joints 

 and numerous, a longer one from fifth or sixth joint, two posterior 

 subapical quite long, apical short, anterior penult longer than the 

 joint. Caudal stylets very short, setae of moderate length, sparingly 

 spreading, the second nearly twice as long as the others. 



Plate 73, fig. 6 a, animal, enlarged ; a', profile of body, showing 

 alimentary canal {%), and heart (h) ; b, second pair of antennae; c, first 

 pair of legs ; d, second or third pair of natatory legs. 



Taken in the Atlantic, October 13 to 16, 1838, latitude 6°-9° 

 north, longitude 21°-24° west. 



Length, one-sixteenth of an inch. Colour, faint purplish blue. 

 The first two segments of the cephalothorax correspond to the first in 

 many other Calani. The last four occupy about two-fifths the whole 

 length of cephalothorax, and are about equal in length. Joints of 

 abdomen short, and stylets not longer than last joint. The longer seta 

 is about as long as the abdomen, and is a little curved. Of the pos- 

 terior subapical setae of the anterior antennae, the inner one is the 

 longest, and the outer margin of each is pectinate setulose. The second 

 pair of antennae have the branches unequal (the shorter two-thirds the 

 longer) ; the last joint of longer branch more than one-third preced- 

 ing ; the two joints of other branch subequal. Natatories four pairs ; 

 the posterior shortest ; the anterior next shortest. A fifth pair rudi- 

 mentary. Abdomen in specimen four-jointed. 



The heart is situated in the posterior half of the thorax, mostly 

 within the fourth segment from the last, extending a little into the 

 preceding. 



