r. T. CLEVE, NOTES ON SOME ATLANTIC I'LANKTON-OKGANISMS. 



AiniiliihymeiiiHin elegans. N. S]). 

 Plate. V. Fig. 1. 



Anns ecjual, nun-e tlinn t^vice as long as bi-oad, 5 fi-jointed; joints increasing in 

 breadth towards the blunt ends. Their axis a- straight line. Patagiurn enveloping the 

 arms with the exception of the distal ends. 



Length 0,24; breadth 0,09 railliin. 



Found at 25 N. .52 W. December 1898. Temperature 24,2. Saliniiy 37, it. Desmo- 

 plankton. 



Aiithocyrtium antheiuis Hke.? 

 Plate III. Fig. 12. 



As there exists no figure of this species, I am somewhat uncertain about the iden- 

 tification. I have seen a single specimen only, which was found alive at 63 N- 2 E. 

 (March 1898), where it occurred together with some species of the tricho-type. The 

 description in H^ckel's Monograph (Chall. Rep. pag. 1273) agrees well with my specimen, 

 but the dimensions are somewhat dissimilar. On my specimen the cephalis was 0,02 millim. 

 long and broad and thorax 0,05 long, 0,i broad. 



HtECKel's species was found in the abysmal depths of the nothern Pacific. If my 

 specimen really belongs to Hti-xkel's species, the occurrence above the deep xNorske 

 Rendex is a fact of considerable interest. 



(.'hallongeron brevispiiia. N. Sp. 

 Plate III. Fig. 14, 15. 



Shell ovate, scarcely compressed, with a single, very short conical spine on the aboi-al 

 pole. Peristome with a single truncate tooth of the same length as the aboral spine. 

 Structure: quincuncially disposed alveoli, about 4 in 0,oi millim. 



Length 0,06; breadth 0,o4 millim. 



1 found a single specimen only in a sample from (53 N. 2 E. (March 1898). 

 Temperature 6,7. Salinity 35, lo. 



('latlirocaiiiiinj iiiinutiiin. N. Sp. 



Plate IV. Fig. '.I. 



Horn of the cephalis fenestrated. Cephalis hemispherical with small subquadrate 

 pores and a horn of l'/2 the length, surrounded by an irregular network. Length of the 

 two joints 3:5; breadth 1:2. Thorax with an irregular network: its ribs united by a 

 circular, irregulary latticed ring. Peristome smooth. 



