246 BULLETIN OF THE 



The description and measurements are taken mainly from the largest speci- 

 men, captured at locality 307, in 980 fathoms. So far as I know, this is the 

 largest Pycnogouid of which exact measurements have ever been given, 

 though WUlemoes-Suhm has i-ecorded a species taken by the " Challenger " 

 Expedition in the Indian Ocean "measuring nearly two feet across the legs." 



SPECIMENS EXAMINED. 

 Stat Locality. 



305 N. Lat. 41° 33' 15", W. Long. 65° 51' 25" 



306 " 41° 32' 50", " 65° 55' 0" 



307 " 41° 29' 45", *' 6.5o 47' 10" 

 839 " 38° 16' 45", " 73° 10' 30" 

 342 " 39° 43' 0", " 70° 55' 25" 



Colossendeis macerrima, sp. nov. 



Plates I., III., and V. 



Body slender, unsegmented, lateral processes separated by intervals equal to 

 about one half their width. The anterior pair of processes turn sharply for- 

 wards and somewhat upwards ; the anterior side is extremely short, so that the 

 articulatory surface looks nearly forwards. Oculiferous segment (Fig. 32), 

 considerably longer than in the two preceding species, rather swollen, with 

 nearly parallel sides. It is concave in front, and the antero-lateral angles are 

 very prominent and darker colored. Oculiferous tubercle scarcely at all ele- 

 vated, otherwise as in the last ; ocelli widely separated, rudimentary, without 

 pigment. Rostrum of remarkable length, being twice as long as the body (in- 

 cluding abdomen). In its present condition it is pretty regularly triangular in 

 outline, but this appears to be due to shrinkage ; normally, it is probably rovmd. 

 It is very slender, swelling slightly a little behind the middle; toward the tip 

 the sides are parallel Viewed from the side, the rostrum is seen to have a 

 peculiar and characteristic curvature ; the basal half is gently convex toward 

 the dorsal side, the distal half gently convex toward the ventral side. 



Abdomen a little more than one thu-d the rest of the body (without rostrum) 

 slightly clavate. 



Palpi (Fig. 9) only a little longer than the rostrum, very slender. There are 

 two very short basal joints ; 3d, extremely long and slender ; 4th, very short 

 and small ; 5th, greatly elongate, more than one and one half times the 3d, 

 almost perfectly cylindrical, though slightly swollen near the distal end ; 6th, 

 about one seventh the 5th ; 7th, equal to the 6th ; terminal three joints nearly 

 equal, very short and small. 



Accessory legs (Fig. 10) attached to the extreme anterior end of the oculifer- 

 ous segment immediately below and behind the palpi. The proportions of the 

 joints are nearly as in the preceding species, but the 4th and 6th are still 

 more elongated and attenuated. The terminal claw (11th joint) is movably 

 articulated with the preceding ; the spines of the 7th to 10th joints (Fig. 12) 



