REPORT ON THE RADIOLARIA. 



663 



I. Subfamily 



Amphitholida. 

 Cupolas developed only in 

 the direction of one 

 single axis (commonly 

 two cupolas). (Tholonida 

 nnidimensiva.) 



Synopsis of the Genera of Tholonida. 



C Two simple cupolas (witli- 



Central chamber simple, J )> ■ ■ 



without medullary shell. ^ rr j -li , / .,i 



■' i wo double cupolas (with 



veil), 



II. Subfamily 



Staurotholida. 

 Cupolas developed in the 

 direction of two axes per- 

 pendicular one to another 

 (commonly four cupolass). 

 (Tholonida bidimen- 

 siva.) 



III. SubfamUy 



Cubotholida. 



Cupolas developed in the 

 direction of three axes 

 perpendicular one to 

 another (commonly six 

 cupolas). (Tholonida 



tridimensiva.) 



Central chamber Larnacilla- 

 sbaped, with enclosed 

 medullary shell. 



Central chamber simple, 

 without medullary shell. 



Central chamber Larnncilla- 

 shaped, with enclosed - 

 medullary shell. 



Central chamber simple, 

 without medullary shell. 



Central chamber Larnaeilla- 

 shaped, with enclosed 

 medullary shell. 



Two simple cupolas (with- 

 out veil), 



Two double cupolas (with 



veil), 



' Four simple cupolas 

 (without veil), 



Four double cupolas 

 (with veil), . 



Four simple cupolas 

 (without veil), 



Four double cupolas 

 (with veil), . 



Six simple cupolas (with- 

 out veil), 



Six double cufiolas (with 

 veil). 



Six simple cupolas (with- 

 out veil), 



Six double cupolas (with 

 veil), 



289. Tholartus. 



290. Tholodes. 



291. AmpMtholns. 



292. Amphitholonium. 



293. Tholostaurm. 



294. Tholoma. 



295. Staurotholiis, 



296. Staurofliolonium. 



297. Tkolocubus. 



298. Tholoniuin. 



299. CubotJiolus. 



300. Cubotholonium, 



Subfamily 1. Amphitholida, Haeckel. 



Definition. — T h o 1 o n i d a with monaxial growth ; cupohis opposite on the poles 

 of one axis. (Shell commonly three-chambered, with two domes ou both sides of the 

 central chamber.) 



Genus 289. Tholartus,^ n. gen. 



Definition. — T holonida with simple cortical shell (without external veil) ; with 

 two hemispherical cupolas, oj^posite on the poles of one axis ; central chamber between 

 them simple (without medullary shell). 



' r/tofartus = Cupola-bread ; Sihr.i, atfToj. 



