REPORT ON THE RADIOLARIA. 



8o: 



The membrane of the central caj)sule is commonly rather thin, and pierced l)y the 

 twenty radial sj)ines, meeting in the centre of the capsule. Between these lie 

 innumerable smaU pores for the radiating pseudopodia ; however, in many cases (and 

 perhaps constantly) these pores exhibit a certain regular disposition. In many species 

 the central capsule encloses Xanthellse or symbiotic yellow unicellular Algae. The 

 nucleus becomes cleft very early in the majority of Dorataspida. 



I. Subfamily 



Diporaspida. 

 Each radial spine 

 ivith two oppo.sito 

 primary apophy- 

 ses; therefore the 

 "whole shell with 

 forty primary 

 apophyses. 



Synoj'isis of the Genera of Dorataspida. 



iSTo by-spines, 



I. Tribe 



Pliractaspida. 

 Twenty radial spines without lattice-plates ; 

 no jiarmal jaores. 



II. Tribe 



Ceriaspida. 



Twenty radial spines 

 all with lattice- 

 plates produced - 

 by union of the 

 branched apo- 

 physes of each 

 plate. 



Forty 

 parmal 



pores (two 

 in each 

 plate) — 



no coronal 

 pores in 



the plates. 



Plates not 

 dimpled, 

 without 

 network 

 of crests. 



With by-.spines, . 



No by-spincs, 



"With by-.spines, . 



Xo by-spines, but 

 free apophyses, 



Plates ] 



dimpled, [ Xo by-spines, 



with a J- 



network | With by spines, . 



of crests. J 



Eighty to t.vo Imndrtd 

 or more parmal pores 

 (in each plate two 

 aspinal and two to 

 ten or more coronal 

 pores). 



Xo by-spines, 

 With by-spines, 



II. Subfamily 



Tessaiaspida. 



Each radial spine 

 with four crossed 

 primary apophy- 

 ses; therefore the 

 whole sliell with 

 eiglity primary 

 apoiahyses. 



III. Tribe 



Stauraspida. 



Twentyradial spines 

 all or partly with- 

 out lattice-plates. 



.,, , , . -ii ( Xo by-spine.s, 



All twenty spines with- ) j i ' 



out lattice-jjlates. 



With by-spines, , 



Four jjlates with, six- \ 



teen without, lattice- • With by-spines, , 

 plates. ) 



Twelve plates with, ) 



eight without, lattice- ■ With by-spines, . 

 plates. ) 



IV. Tribe 



Lychnaspida. 



Twentyradial spines 

 all with lattice- 

 plates (produced 

 by union of the 

 branched apophy- 

 ses of each plate). 



Eighty parmal pores 

 (four on each plate) 

 — no coronal pores in 

 the plates. 



One hundred and sixty 

 to three hundred or 

 more jiarmal pores 

 (in each plate four 

 aspinal and four to 

 twelve or more 

 coronal pores). 



X^o by-spines, 

 With by-spines, , 



Xo by-spines, 

 "With by-spiues, . 



349. Phradaspis. 

 3.50. Fleriraspis. 



351. Doraiai'pis. 



352. Diporaspis. 



353. Orophaspiis^. 



354. Cen'aspis: 

 .355. HydricliOiipii.'f 



356. Cosdnaffpi'ti. 



357. Acontaspis. 



358. Staunispiit. 



359. Ecldnaspiis. 



3 GO. Zonaspis.. 



361. Dodecaspiis^ 



362. Tcssaraxpig. 

 3G3. Li/dinasjits. 



364. Ifosasjn's. 



365. Ili/laspis. 



