36 THE VOYAGE OF H.M.S. CHALLENGER. 



Habitat. — This species occurred in moderate numbers in surface-net gatherings from 

 many different localities :— " Lat. 26° 21' N., long. 33° 37' W., down to 80 fathoms, May 3, 

 1876 ; "and near the Philippine Islands, January 1875 ; also between Api and Cape York ; 

 off Port Jackson, at night ; off Kandavu, Fiji ; in lat. 9° 43' S., long. 13° 51' W. (Station 

 342); and in several North Atlantic gatherings between lat. 3° 10' N., long. 14° 51' W., and 

 lat. 9° 9' N., long. 16° 41' W. (Stations 348-351). I cannot be quite certain that this is 

 rightly assigned to Dana's Calanus gracilis, though his description and figures contain 

 nothing inconsistent with that supposition. Even if this be the case, it is more than 

 probable that future research will render necessary the formation of a new genus for the 

 reception of this and other allied forms. At present I have seen only one male specimen, 

 and am unable to speak with confidence as to the structure of the fifth feet, which were 

 not very distinctly made out. But I can scarcely doubt that they are distinct from those 

 of the typical Calani. 



6. Calanus iwinceps, n. sp. (PI. IV. figs. 3-7). 



Female. — Length, half an inch (12*5 mm.). Anterior antennas (fig. 4) longer than the 

 body, slender, sparingly setiferous, the basal joints, as far as the eighth, very short, the rest 

 very long, — mostly four or five times as long as broad, — except the twenty-fourth, which 

 is short, and bears on the middle of its inner margin an excessively long plumose seta, 

 the branches of the mandible-palp are very short, equal, the outer having two, the inner 

 three joints. The maxilla-palp (fig. 5) is made up of fewer segments than usual, having 

 one quadrate and two ovate plates, together with a single, small bisetose digit. The 

 anterior foot-jaws are armed with strong, curved setae, which are densely clothed on their 

 inner margins with short, delicate, and closely set hairs (fig. 6), except towards the base, 

 where the setse are naked. The joints of the outer branches of the swimming feet (fig. 7) 

 are much constricted at the base, the marginal spines are short and stout, the terminal 

 spines very slender, with finely serrated margin. The setse, both of feet and mouth- 

 organs, are all densely feathered with long, brownish cilia. The colour of the body is a 

 deep reddish-brown. The abdomen is short, stout, and three-jointed. 1 



Habitat. — This fine species — the largest, so far as I know, of the Calanidse — occurred 

 in two dredgings, but only one specimen was found in each locality. Station 45, 

 lat. 38° 34' N., long. 72° 10' W. ; depth, 1240 fathoms ; bottom temperature, 2° 4' C. ; 

 mud. — Station 50, lat, 42° 8' N., long. 63° 39' W. ; depth, 1250 fathoms ; bottom 

 temperature, 2° 8' C. ; grey ooze. 



1 Since this description was written, Mr. Murray has sent me a drawing made by Dr. von Willenioes-Suhm from a 

 freshly taken specimen. A memorandum on the drawing states that the animal was found " on the swabs of the dredge 

 (surface 1) on May 3, 1873, depth 1250 fathoms, off Sandy Hook, North America, lat. 38° 34' N., long. 72° 10' W." I am 

 disposed to think, seeing that all the specimens have been obtained from the dredge, that this species is really an 

 inhabitant of the deep sea, and not casually entangled by the dredge on its way to the surface. 



