1070 



CRUSTACEA. 



the outer joint of one branch five- or six-articulate. Abdomen four- 

 jointed, first segment oblong. 



Calanus sanguineus. 



Frons rotundatus. Cephalotliorax b-ariiculatus, posticd obtusus aut sub- 

 acutus, articulis 4 posticis subcequis. Antennce anticce corporis longitu- 

 dine, fere rectce, apicibus f route vix posterioribus ; setis brevibus, und 

 articuli tertii longiore, subapicalibus iis tenuicornis fere similibus. Styli 

 caudales paulwn obloyigi, setis mediocribus, diffusis, secundis longiori- 

 bus. 



Eront rounded. Cephalothorax five-jointed, last four segments sub- 

 equal, posterior angles a little prolonged, obtuse or subacute. An- 

 terior antennae as long as body, nearly straight, the tips scarcely 

 posterior to line of front, setae short, one longer from third joint, 

 subapical as in the tenuicornis. Caudal stylets a little oblong, 

 setae spreading, of medium length, the second a little elongate. 



Plate 73, fig. 11 a, animal, enlarged ; b, extremity of antenna. 



Collected abundantly, May 28, 1841, in the Pacific, latitude 32° 

 north, longitude 173° west; also, July 6, 1841, latitude 44° north, 

 longitude 153° west; also, the same species, apparently, January 28, 

 1842, in the Sooloo Sea, east of Pan ay. 



Length, one-tenth of an inch. Often deep red; also, colourless. 

 On May 28, 1841, the sea was coloured red by this species over 

 large areas. The blood-coloured areas mostly formed bands, two to 

 four feet wide, extending as far as the eye could reach, at right angles 

 with our track, the vessel heading east-northeast, with the wind at 

 southeast by east. Anatifas were abundant at the same time. 



The antennae have, at intervals of a few joints, a seta two or three 

 times as long as the others. The posterior subapical setae are as long as 

 the last five or six joints ; the posterior apical about as long as apical 

 joint ; anterior apical much shorter ; anterior penult as long as last 

 two joints. Abdomen four-jointed, segments subequal. 



