44 CLEVE, PLANKTON FROM THE INDIAN OCEAN AND THE MALAY AUCHIPELAGO. 



First pair of antennce reach to Th 3, proximally incrassate, 17- (or 18) -jointed. 

 The 9 distal joints twice or more as long as broad. The first (proximal) joint as long 

 as broad; the following 6 (or 7) joinis very short, much broader than long. 5 as a rule 

 short, but longer on the short proximal part. 



Second pair of antennoi. B 2 with 2 fine S. Ri IV2 tirnes longer than Re. Ri 

 four times longer than broad, Ri 1 without S. Ri 2 cylindrical, its Li rudimentary, 

 with 2 Se. Le with 5 plumose S. Longitudinal proportion of the joints oi Re 1:2:3 

 ~6 : 7, as 1:3:1: IV2. Re 1 and 2 naked, Re 3-4 with 4 S. Re 1 with 2 S. 



Mandihles. B 2 twice as long as broad, naked. Ri not developed. Re half as 

 long as B 2, with 6 S, the longest at least 3 times longer than the mandible. 



Masticatory apparatus well developed, with 4 strong, acute teeth, the exteriör of 

 which is the largest and separated by a deep gap from the other. Si very small. 



Maxilla rudimentary. B \, B 2 and Ri of equal length. Le 1 with 5 delicate *S'. 

 Li 1 ^vith 3 faint »S. Ri without articulation, with 3 soft S, as long as the maxilla. 

 Re naked. Le 2 and Li 2 from small gibbosities {Le 2 perhaps with 1 fine *S). 



First pair of maxillipeds 4 times longer than broad. {L\ and L 2 not developed). 

 L 3 with \ S. L 4 Avith 2 S. L 5 twice as long as broad, with a central, stout spine. 

 L 6 with 2 Se. Ri with 4 falciforra Sa and 2 half as long Sj). The seta?. of L 3 — 6 are 

 not half as long as the Sa of Ri. The S of Ri are covered with short hairs or scales. 



Second pair of maxillipeds protracted, 7-jointed, Bl, B 2 and Ri being of equal 

 length. B 1 with 3 small S, the proximal short and spinulose, and 2 distal, one of them as 

 long as the joint is broad and spinulose, the other very small and naked. B 2 proximally 

 with 2 very faint *S, centrally with 2 longer S, one of which is plumose on the anterior 

 side, distally with 1 strong short-haired and 1 very faint S. Ri 1 and Ri 2 each with 

 1 falciform, distally short-haired S as long as Ri, and centrally Avith a group of 3 naked 

 S, half as long as the former. Ri 3 and 4 each Avith 1 short and 1 long S, the latter 

 similar to the longer »S on the preceding joints. Ri 5 Avith 3 ä, 1 similar to the 

 longer S on the preceding joints, 1 half as long and 1 A-ery fine, naked. 



Natatory legs, 1st — 4th pairs. B 1 short, Avith 1 Si (not seen on the 4th p.), not 

 hairy. B 2 broader than long; its interiör margin convex, naked, but on the 1st p. with 

 a Si. Re and Ri of all pairs 3-jointed. Ri of the 2nd — 4th p. reach somewhat beyond 

 Re 2. Re of the 1st p. inserted on B 2 more proximally than Ri, of the other pairs on 

 about the same level. Re 1 and 2 of the 1st — 3rd pairs of almost equal length; Re 2 of 

 the 4th p. someAvhat longer. Re 3 of the 1st p. not half as long, but of the 2nd — 4th p. 

 ^/s as long as Re 1 and 2 together. Re 3 about 3 times longer than broad. Se of the 

 1st p. 1, 1, 1, of the other 1, 1, 3. Se of the 1st p. bristle-like, of Re 1 long, reaching 

 beyond the distal margin of Re 2. Se of the other pairs triangulär, Avith not distinctly 

 serrated edges (on the 3rd p. serrated on the inside). The Se of Re 1 and 2 are the 

 largest, especially on the 3rd paii-. The exteriör margin of the joints goes at each Se ont 

 in a small apex. On the proximal part of Re o of 2nd — 4th pairs the Se diAdde the 

 joint in three almost equal parts. St of the 1st p. bristle-like, of the other knife-like, 

 with very finely serrate exteriör margin. St of the 1st p. longer than i?e 3, of the other 

 pairs somewhat shorter than Re 3. BetAveen St and Se 3 a small spine. Si of tlie 1st p. 



