1072 



CRUSTACEA. 



anticd antepenidtimd minutd. Abdomen 4:-5-articulatum. Styli 

 caudales breves, setis appressis, secundis longioribus. 



Front rounded. Cephalothorax five-jointed, four posterior joints sub- 

 equal, obtuse behind. Anterior antennae slightly longer than body, 

 straight even from the basal joint, which is stout and oblong, tips in 

 line of beak, first (or second) joint stout and oblong, and furnished 

 with inflexed setae, setae very short, on second joint a seta three 

 or four times as long as diameter of joint, apical setae short, 

 posterior antepenult seta nearly as long as last four joints, posterior 

 penult half shorter, anterior penult still shorter (about as long as 

 penult joint), anterior antepenult minute, apical shorter than apical 

 joint. Abdomen four to five-jointed. Caudal stylets very short, 

 setae but slightly divergent, the second a little elongate (one-fourth 

 longer than third) . 



Plate 74, fig. 2 a, animal, enlarged ; b, extremity of antenna. 



Collected, July 6, 1841, in the Pacific, latitude 44° north, longitude 

 153° west. 



Length, one-tenth of an inch. Colour, slightly yellowish. The 

 two anterior antennae lie in the same transverse line. The basal 

 joint is long and stout, with a few short uncinate setae ; and on the 

 following joints several of the setae are curved or hooked. The ante- 

 penult joint is longer than either of the following, and the last is 

 somewhat longer than the penult. At apex, one or two of the anterior 

 setae extend outward, and are uncinate. The setae of the posterior 

 antennae and following organs are rather short. The specimens were 

 taken at the same time with the C. sanguineus, and they somewhat 

 resemble that species, though different in the base and terminal setae 

 of the antennae, and the abdomen and caudal setae. 



Calanus inauritus. 



Frons rotundatus. Cephalothorax postict obtusus, 5-articulatus, articulo 

 ultimo brevissimo. Antenna? anticce fere rectce, corpore paulo breviores, 

 artieido primo valde elongato {an duplice?) tHbus setis pendulis sub- 



