4 V. T. CLEVE, NOTES ON SOME ATLANTIC PLANKTON- OKGANISMS. 



Feina/f. Length of cf])halothorax 0,ss, of abdomen 0,2r., of furca 0,oo, of the longest 

 seta of the fiuva 0,4 millini. Breadth of cephalotliorax 0,j.. niillim. 



Last segment of tlic thorax with two small finger-like processes. Its margin not 

 spinous. 



The genital-segment of abdomen three times longer than the second segment, which 

 is as long as the third one. The longest seta of the furca exceeds the abdomen in length. 

 All seta3 of equal thickness. Furca ncarl}' twice as long as broad. 



Rostral filaments present. 



Cephalothorax three times longer than broad. 



Fifth pair of feet: B. e very short, uniting with B. 2; its interior margin denticulate. 



This fine species is most akin to A. nerrucosa Thomps., but is easily distinguished 

 by the fifth pair of feet botii of the male and the female. 



Habitat. The Azores, rare in August and September 1898. Temperature: 21,2 to 

 21,4. Salinity: 36,25 to 36,2s p. m. 



Corj'Cifus long;icaudis Uana. 

 Plate I. Fig. 811. 



Male. Abdomen one-jointed, twice as long as the furca. Branches of the furca 

 at least 7 times as long as broad. 



Dimensions: total length 0,k, length of cephalothorax 0,.., of abdomen U,.s, of furca 

 0,1 millim. 



The male of this species has not been described in Giesbrecht's Systeviatik und 

 Faanistik der Pelagischen t'opepodem. It is common in the whole tropical Atlantic. 



Kiicliin'lla rostrata Olaus. 



I'latc II. Fig. 1 12. 



Male. Head without ci'ista, l)ut with a subulate rostrum. Fifth foot, six times as 

 long as its B. '2. Margin of its A', e. 2 not denticulate and of the R. e. 3 smooth, i?. e. 

 of the posterior anteniuc twice as long as R. i. No triangular scales on the inside of B. I 

 of the 4^^ foot. 



Length of cephalothorax 2, of abdomen 0,5, of furca 0,os millim. 



The male has not been described by Giesbrecht's in the Systeiuntik und Faunistik der 

 Pelagisclien Coj)e2Joden, but he mentions as questionable synonyme Euchceta Hessei Brady 

 (Chall. Rep. Vol. VIII pag. 63). A comparison af my fig. of the fifth foot with the 

 di'awing of Brady proves that Euchceta Hessei is exactly the same as Euchirella rostrata. 



Some few specimens of the male were found together with several females in De- 

 cember 1898 oft' the Canaries. 



