KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 35. N:0 5. 45 



1, 1, 4, of the other 1, 1, 5, plumose. The 3 joints of Pu of the 1st and 2ud p. of equal 

 length; on tlie other pairs Ri o has of about the length of Bi 1 and 2 together. Se of 

 Ri of the 1st p. O, O, 1, of the other O, O, 2. Si of the 1st p. 1, 2, 4, of the 2nd and 

 ;3rd 1, 2, 6 of the 4th 1, 2, 5. 



Fifth pair. of lec/s symmetrical, 2-jointed. B as long as broad; Be not joiuted, 3 

 times longer than B, with 2 distal »S. 



Description of the male. Body. Length (anterior part 0,4, posterior 0,iö) 0,ö5 mm. 

 Ce less than half as long as the 4 other joints together. Abdomen 5-jointed; longitudinal 

 proportion of the joints 10 : 5 : 5 : 10 : 3. 



First pair of antennce. Left and right slightly dissimilar. Left antenna 1 5-jointed; 

 its proximal part tliick. First joint as long as broad, the foUowing 2 — 5 vei"y short; 

 the 6th and 7th as long as broad, the 8th to 14th twice as long as broad; the terminal 

 joint prosimally with a slight concavity {rudimentary prehensile apparatus?). TheSthin; 

 seusorial appendages long and numerous. The right antenna has 17 joints. 



The 2nd pair of antennas, the mandible and its masticatory apparatus, the maxilke 

 and rnaxillipeds as well as the natatory legs almost as on the female. 



The ffth pjair of legs symmetrical B somewhat longer than broad, naked. Ri not 

 developed. Re of 2 almost equal joints and a terminal S ^vith broad basal part {Ri 3?). Re 

 2 with a short distal Se. 



Systematical position. The almost similar left and right antennie of the male 

 and their numerous sensorial appendages point to a relation to the Calanidce, but, on the 

 other hand, most characteristics place this genus near Augaptilus Arietelias and especially 

 Paramisophria, the latter genus recently formed by Tti. Sgott (Fifteenth Ann. Rep. of 

 the Fishery Board for Scotland, pag. 149) for a small species of Loch Fyne. The named 

 genera ha-\-e all been classified as belonging to the Centrojjagida?. 



Occurrence. This small species evidently belongs to the litoral or neritic fauna 

 and has been found, not very sparingly, in a coUection from the island Langkuss, N. W. 

 of Billiton, in the Malay Archipelago, September 1899. 



Oitliona rigida Giesbk. 



(Zool. Jahrb. 1896, Systematik, Vol. IX, p. 324.) 

 (Pl. V, fig. 7—18). • 



Diagnosis. Female. Front dorsally truncate, laterally cur\ed in a right angie, 

 blunt. Anterior antenna; reach to the postei-ior margin of Tk 2. Furca as long as the 

 anal-segment, 2V2 times longer than broad. Anterior part of the body longer than the 

 posterior. L. 0,75 to 0,85 mm. 



Male. Posterior margin of Th 1 a straight line. Se of the Re 3 of the 1st — ord 

 pair of legs 3. The four posterior abdominal joints of equal length. L. 0,7 mm. 



Habitat. Dr. Giesbrecht found this species sparingly in a sample from the Red 

 Sea. I found it rather common in some samples from the Malay Archipelago. 



Description of the female. Body. Length (anterior part 0,5, posterior part 0,35) 

 0,75 to 0,85 mm. Anterior part twice as long as broad, 3V2 times broader than the 



