REPORT ON THE RADIOLARIA. 



1733 



pole of the main axis, whilst the two lateral accessory openings, or parapylae, lie on both 

 sides of the posterior (or aboral) pole, to the right and left. The position of the capsule 

 is therefore the same as in the preceding Concharida (Pis. 123-125), and the following 

 Coelographida (Pis. 126-128), The large nucleus, enclosed in the central capsule, is 

 usually half as broad, and contains numerous nucleoli. 



The calymma, or the extracapsular jelly-veil, is in the Ccelodendrida usually spherical, 

 very voluminous, and includes the entire skeleton, the thicket of the Ccelodorida as 

 well as the lattice-mantle of the Coelodrymida. Only the outermost terminal branches 

 of the tubes in the former, and the radial bristles and spathillae on the surface of the 

 latter, remain free and project beyond the surface of the calymma. The phseodium is 

 usually very large, three to four times as broad as the central capsule, and envelops it 

 often completely. Usually it envelops only the anterior half of it, and the proboscis 

 (PI. 121, figs. 1, 9). Often numerous green, brown, or blackish phseodellae are scattered 

 through the whole calymma, and sometimes accumulate in a superficial layer on its 

 surface. The galea of both valves is usually also filled up by the phseodium. 



Synojms of the Genera of Ccelodendrida. 



I. Subfamily 



Ccelodorida. 

 Hollow tubes, arising from the 

 galea of botli valves, simple or 

 dichotomously branched ; the 

 branches always free, not anas- 

 tomosing. 'No outer lattice- 

 mantle. 



n. Subfamily 



Coelodrymida. 



Hollow tubes, arising from the 

 galea of both valves, dichoto- 

 mously branched; the branches 

 anastomose and form an outer 

 bivalved lattice-mantle. 



Tubes simple, not branched. 



Tubes forked or dichotomously branched, . 



Lattice-mantle simple; its meshes lying in a spherical 

 surface, ...... 



Lattice-mantle spongy; its meshes lying in different 

 planes, ...... 



727. Ccelodoras. 



728. Ccelodendrum. 



729. Coslodrymus. 



730. Ccelodasea. 



Subfamily 1. Ccelodorida, Haeckel. 



Definition. — C oe 1 o d e n d r i d a without an external bivalved lattice-mantle, with 

 simple or branched hollow tubes, the terminal branches of which are free, not anastomosing. 



Genus 727. Ccelodoras,^ n. gen. 



Definition. — C oe 1 o d e n d r i d a without external lattice-mantle, wdth simple, not 

 branched, radial tubes, which arise separately from the galea. 



1 Ca!todoro6= Hollow spear; xo'ihoc, Id^us. 



