0RJAN OLSEN 



[REP. OF THE "MICHAEL SARS" NORTH 



Co/ossende/s michaelsarsii n. sp. 



PI. I. fig. A. 



A female specimen taken at Stat. 41 in the trawl at 

 1365 metres must be looked upon as the type of a new 

 species, with the following diagnosis: — 



Proboscis almost the same length as the rest of the 

 body (abdomen included), swollen at the middle, bent 

 downwards; abdomen nearly one third the length of the 

 body (without proboscis); oculiferous tubercle low, obtusely 

 conical, with two unpigmented ocelli; palpi shorter than 

 the total length of the body, the third joint being about 



Fig. I. Colossendeis michaelsarsii n. sp. 

 Proboscis and ocular tubercle, side view. 



visible to the naked eye. The extremity of the abdomen is 

 a little swollen and pointed. The palpi are 41 mm long, 

 the two first joints being wider than they are long (see 

 pi. I, fig. A); third joint is 16 mm in length, and only 

 slightly swollen at the extremities; fourth joint IV2 mm 

 long and nearly equally wide; fifth joint 7 mm in length, 

 sixth joint 2 mm, seventh joint 4 mm, eighth joint 3 mm, 

 ninth joint 2 mm and tenth joint 3 mm, slender and 

 tapering. The first two joints are about 2 mm wide, the 

 following three joints about IV2 mm, the last five joints 

 tapering gradually outwards. Except for the two proxi- 

 mal joints, the palpi are furnished with short stiff hairs, 

 those on the five distal joints being the stoutest and 

 longest. The accessory feet (fig. 2) are about 72 mm 

 long, and, as usual in this genus, attached close behind 

 the palpi. The first three joints are IV2 mm long, and 

 of nearly the same width; fourth joint about 24 mm long 

 and l'/s mm wide, somewhat swollen at the outer extre- 

 mity; fifth joint 6 mm long, but as stout as the fourth 



Fig. 2. Colossendeis michaelsarsii n. sp. 

 Left false leg. 



twice as long as the fifth; the two tarsal joints about the 

 same length, and four times as long as the end-claw. 

 The entire length of the body is about 50 mm; the pro- 

 boscis being 25 mm, the trunk 19 mm, and the abdomen 

 6 mm in length, and the circumference about 480 mm. 

 The proboscis is directed downwards (fig. 1), cylin- 

 drical in its proximal third, with a diameter of about 3 

 mm; at the middle it swells so as to measure 4 72 mm 

 in diameter, decreasing to 3 1 2 mm, and swelling again 

 at the end to 3 2 .; mm. The mouth is large and trian- 

 gular. The trunk is robust, somewhat flattened, with a 

 width of 4 mm, and a height of 4 1 2 mm. A distinct 

 sutural line, dividing the lateral appendages from the 

 central portions of the body, is to be seen on the dorsal 

 surface. The proboscis as well as the whole body, dor- 

 sally and ventrally, are furnished with tiny hairs, barely 



Fig. 3. Colossendeis michael- 

 sarsii n. sp. 

 Grasping organ forming the 

 tip of the false leg (right side). 



Fig. 4. Colossendeis michael- 

 sarsii n. sp. 

 Terminal portion of walking 

 leg. 



joint, and also swollen at the outer extremity; sixth 

 joint 26 mm long, a little more than 1 mm across; 

 seventh joint nearly 4 mm, eighth joint 9 mm, and tenth 

 joint about 3 mm long, tenth joint slender and tapering, 

 seventh, eighth and ninth about 1 mm across. The last 

 four joints are furnished with numerous fine transverse 

 ridges, and form together a spiral-shaped prehensile organ 

 (fig. 3), so that the seventh and the ninth, the eighth and 

 the tenth joints are situated approximately parallel to one 

 another. The accessory feet are covered with sparse, very 

 short hairs, hardly visible without a magnifying glass. 

 The fourth joint of the true feet is longest and stoutest, 

 the rest decreasing in length and thickness, the swelling 

 at the extremities of the joints being very slight. On the 

 fourth foot the fourth joint is 59 mm in length and 272 

 mm in thickness; fifth joint 52 mm long and 2 mm thick; 



