RADIOI.ARIA LITHOLOPHUS, LITHd.M P.LISSA 171 



Planktontype. L. lif/n/'inns is found the Medilerranean and 

 central Pacific, L. dccimalis also in the Atlantic and Indian Ocean, 

 L. ai'cricus from Davis's Slrait. If they, as I belive, represent one 

 species only, this species belongs principally to the east Atlantic and 

 spreads thence to the northern and arctic Atlantic, being one of the 

 most enrythermous forms of the S/yli-plankton. 



LITHOLOPHUS RHIPIDIUM Hkl.i 



(Monogr. pag. 402 PL XIX fig. 6. — L. dcm/ifistif: Hkl. included.^ 



1898 Scplrnihrr: Ifr N. 71^ W.; 29" N. 74° W. 

 Octdhcr: Azores. 



Xovrinber: 4° x\. 3()^W.; 45" N. T W. 

 December: Canary Islands; Azores. 



1899 March: 36^ X. 29 W. 

 April: 48° N. 9° W. 



June: 0° S. UV W.; 4° S. 19^ Vv, 



Temperature: 21.3, mean of 12 o)js., max. 28 i, min. 12. i. 

 Salinity: 35. ss, mean of 10 obs., max. 3().76, min. 34.96. 

 Plankton-type. Found in the region W. of Sierra Leone and 

 in the ilediterranean. — .S. 1). 



LITHOMELISSA THORACITES Hkl.- 

 (Monogr. pag. 301 PI. VI fig. 2-8.) 



1S98 January: T X. 53" W. 



February: Iti" X. 71° W. to ;!0" N. 74° W, 



May: 41° N. 51° W. 



Seplcmbcr: 9' X. 53' \V 



Xoveiiiher : 50'' X. 23 W. 



Becenibe/': 18° N. 67° W. 

 1899 January: 45° X. 49^ W. 



Temperature: 20.i, mean of 9 obs., max.28. min. lU.s. 



1 K\\ observations before September 1898 excluded as not trustu-orthy. 

 ' Li//ini,iclissn llmriirite^ Ai Riv. (Kongl. Sv. Vet. Akad. Handl. Vol. XXXII n. 

 6 pag. 28j from the Arctic Sea is another species, or Pi-riiliiua ? iiilindlnm Ci.. 



