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



3. Calanus propinquus, n. sp. (PL II. figs. 1-7, and PL XIV. figs. 10, 11). 

 Length, 22-100ths of an inch (5"5 mm.). Head indistinctly separated from the thorax ; 

 forehead broad and obtuse, thorax narrowed towards the posterior extremity, and terminat- 

 ing in acute lateral angles. Caudal stylets oblong, divergent, about twice as long as 

 broad; setae densely plumose, about as long as the abdomen, except the second, which is 

 about three times as long. Anterior antennae very little longer than body, and (in spirit 

 specimens) often curled round the back; the penultimate and antepenultimate joints have 

 each an extremely long ringed and plumose seta. Branches of the posterior antennae of 

 equal size. The basal joint of the peduncle of the fifth pair of feet bears a row of several 

 (about fifteen) serratures on its inner margin, the last four or five being larger than the 

 rest, and situated on the distal angle of the joint; 1 marginal spines of the swimming 

 feet rather small and slender, terminal spine slender, and devoid of serratures, and 

 slightly bent at the apex; in the male the fifth foot of the right side has its outer branch 

 very long, the first joint as long as the whole of the inner branch, the second joint still 

 longer, the third small, subovate, and bearing a slender terminal spine ; spines of the 

 outer margin of the limb obsolete, the inner branches of both sides are destitute of setae. 

 The basal serratures in the male are of uniform size. 



Habitat. — I have noticed this species in the following gatherings : — Lat. 46° 46' S., 

 long. 45 c 31' E. (Station 146); lat. 64° 37' S., long. 85° 49' E. (Station 154); and in lat. 

 47° 25' S., long. 130° 12' E. ; and between Stations 298 and 299 (South Pacific) ; in lat. 

 35° 41' N.,long. 157° 42' E. (Station 241) ; lat. 40° 3' S., long. 132° 58' W. (Station 288) ; 

 and in lat. 9° 43' S., long. 13° 51' W. (Station 342); in lat. 3° 10' N., long 14° 51' W. 

 (Station 348); off Kerguelen Island; and in lat, 37° 17' S., long 53° 52' W. (Station 320). 



4. Calanus tonsus, n. sp. (PL IV. figs. 8, 9). 



Female. — Length, l-7th of an inch (3"6 mm.). Like Calanus finmarchicus and Calanus 

 propinquus, except that the anterior antennae (fig. 8) are almost entirely devoid of setae 

 except on the three apical joints, those of all the other joints being almost imperceptible ; 

 the posterior antennae are setiform along almost the whole length, like those of Calanus 

 propinquus. The fifth pair of feet have no basal serratures, and the first segment of the 

 female abdomen is large and tumid (fig. 9). The anterior antennae are as long as the 

 body of the animal. No males were seen. 



Habitat. — Taken abundantly in the tow net in lat, 38° 6' S., long. 88° 2' W. 

 (Station 296), and in another gathering from the same latitude, but about 4 degrees further 

 west; also in lat. 35° 41' N., long. 157° 42' E. (Station 241) ; about lat, 40° S., long. 

 132° W. (near Station 288); in lat. 39° 22' S., long. 98° 46' W. (Station 294) ; in lat, 



1 The figure of the entire foot in PI. II. has been drawn from a limb placed in n distorted position, and gives an 

 ncorrect idea of the arrangement of the spines. 



