KADIOLAKiA OF THK TASMAN SEA— HASWKLL. 281 



The specimen referred to this species agrees in all particulars 

 with Haeckel's description except in the dimensions of the largest 

 spicules, which is given as 0"15 mm., nearly twice as large as any 

 in my specimen. The zooids have a diameter averaging 0-07 ram. 

 The intra-capsular plasm is coarsely granular : it contains four to 

 eight nuclei. Five or six Xaiithellae are closely applied to each 

 capsular membrane, and there are none in the intermediate 

 spaces. 



The "Challenger" locality for *S'. qwidrigf^iniiivAn is the North 

 Atlantic and the Azores. 



A single fragment was obtained of a Spho^rozoum which closely 

 resembles the above in the form and dimensions of tlie spicules ; 

 but whicli has the zooids thrice as large. 



Sph^rozoum alveolatum, HaeckeJ. 



jSph(erozoum alveolafiun, Haeckel, The Radiolaria, ChalL ^j<pp-, 

 Zool.) xviii., 1887, p. 4:3, pi. iv., figs. 2, 3. 



It is with some doubt that I refer to this species several speci- 

 mens of a Sphfhrozonm. The alveoli, to tlie presence of which 

 the species owes ibs name, are certainly absent ; but there is a 

 close correspondence in the form of the spicules, tliough their size 

 is less in my specimens than the measurements given by Haeckel. 

 The zooids in two of the specimens have a diameter of about 0"06 

 mm. ; they contain granular plasm witii a central oil-globule and 

 about half-a-dozen nuclei. In certain respects these two speci- 

 mens, though in the same phase, differ from one another. In the 

 one the spicules are very numerous, and are definitely arranged 

 around the zooids ; in the other they are comparatively few, and 

 are irregularly distributed. The former specimen has no 

 Xanthdhp in the interspaces between the zooids ; while in the 

 latter they are numerous. 



A third specimen, which has very numerous densely aggregated 

 spicules, has the zooids twice as large (0"1 to 0*12 mm.) and filled 

 with a multitude of small nuclei. 



<S'. alveolatum was obtained by the "Cliallenger" off Juan 

 Fernandez. 



SPHiEROZOUM GEMINATUM, Haeckel. 



Hphwrozoum geminahim, Haeckel, The Radiolaria, Chall. Rep., 

 Zool., xviii., 1887, p. 45, pi. iv., fig. 4. 



One specimen. Originally obtained by Haeckel in tlie Indian 

 Ocean. 



