REPORT ON THE RADIOLARIA. 



1315 



Syno2:)sis of the Genera of Podocyrtida. 



I. Subfamily 



Theopilida- 

 (Podocyrtida 

 aperta.) 



Terminal mouth 

 of the shell a 

 simple wide 

 opening. 



II. SubfamUy 



Theoperida. 

 (Podocyrtida 

 clausa.) 



Terminal mouth 

 of the shell 

 closed by a 

 lattice-plate. 



A. Three free 

 limbs or wings 

 on the thorax 

 (partly also 

 on the abdo- 

 men). 



No free ex- 

 ternalappen- 

 dages on the 

 abdomen. 



Three wings of 

 the thorax - 

 solid. 



' Wings arising from 

 the thorax, 



Three ribs enclosed 

 in the wall of the 

 thorax, . 



Wings arising free 

 from the collar 

 stricture, 



Wings not prolonged 



T,, . c into the cephalis, 



ihree wings oi ■ r ' 



the thorax , ^-.t- i j 



latticed. n\|ngs prolonged 



[ into the cephalis. 



Free appen 

 dages on the ■ 

 abdomen. 



Three ribs pro- 

 longed into 

 three termi- 

 nal feet. 



Ribs and feet solid. 



Ribs and feet lat- 

 ticed. 



Three free f Wings and 



wings on the | solid, . 

 thorax. Nu- <! 

 meroiis termi- | Wings and 

 nal feet. [ latticed, . 



feet 



feet 



B. Free appen- 

 dages not on 

 the thorax, 

 only on the 

 abdomen. 



Abdomen with three ribs and three feet. 



Three feet 

 simnli 

 "1 Abdomen without lateral ribs. 



with three terminal feet. 



solid. 



solid. 



. simple, . 



Three feet 

 ramified, 



Three feet latticed. 



Three lateral wings only on the thorax. 



i 



Wings solid, 



( Wings latticed, 



Three lateral wings beginning from the thorax and prolonged into 

 the abdomen, ....... 



f No horn on the 

 Shellspindle-shaped,withthree I basal pole, . 

 lateral wings on the abdo- \ 



Three wings 

 only on the ' 

 abdomen. 



L 



Basal pole of the 

 shell with a horn. 



Shell three-sided pyramidal, with three terminal- 

 feet on the basal corners, .... 



582. Pterocorys. 



583. Theopilium. 



584. Corocahjptra. 



585. Didyoceras. 



586. Pteropilium. 



587. Tlieopodium. 



588. Pterocanium. 



589. Pterocodon. 



590. Didyoeodon. 



591. Pleuropodium. 



592. Podocyrtis. 



593. Thyrsocyrtis. 

 59i. Dictyopodium. 



595. Ldthomithium. 



596. SethornitMum. 



597. Theopera. 



598. Eliopalocanium. 



599. Rhopalatradus. 



600. Lithocliytns. 



Subfamily 1. Theopilida, Haeckel, Prodromus, p. 435. 



Definition. — P o d o c y r t i d a with the terminal mouth of the shell open (vel 

 Tricyrtida triradiata aperta). 



