REPORT ON THE RADIOLARIA. 1641 



the bars of which bear on the outside bunches of similar tridentate anchor-threads. At each 

 nodal point arises a simple, smooth, radial spine, which bears at the distal end a verticil of three 

 or four small, curved, terminal branches. 



Dimensions. Diameter of the inner shell 0'2 to 0'3, of the outer T5 to 2'0. 



Habitat. Antarctic Ocean, Stations 154 to 157, depth 1300 to 1975 fathoms. 



3. Cannosphcera pacifica, n. sp. (PL 112, fig. 4). 



Internal shell mammillate, with one hundred to one hundred and twenty radial rods, which are 

 studded with cruciate verticils of tridentate anchor-threads. External shell with irregular, mostly 

 hexagonal meshes, the bars of which bear on the outside and on the inside bunches of similar 

 tridentate anchor-threads. At each nodal point arises a simple, thorny, radial spine, which bears 

 at the distal end an elegant verticil of fifteen to twenty flatly expanded, thin, terminal 

 branches. 



Dimensions. Diameter of the inner shell 0'25 to 0'35, of the outer 2 - to 2 - 5. 



Habitat. Central Pacific, Stations 270 to 274, depth 2350 to 2925 fathoms. 



Genus 692. Ccelacantha,\ R. Hertwig, 1879, Organism, d. Radiol., p. 91. 

 Definition. C annosphaerida with a latticed internal shell. 



The genus Ccelacantha comprises those Cannosphserida in which the inner shell is 

 formed by a fenestrated flint-plate, and exhibits numerous pores between the prominent 

 bases of the radial beams. 



1. Ccelacantha anchorata, R. Hertwig. 



Ccelacantha anchorata, R. Hertwig, 1879, Organism, d. Radiol., p. 92, Taf. ix. fig. 2. 



Internal shell slightly mammillate, with thirty to forty radial rods, which are densely studded 

 with verticils of tridentate anchor-threads. External shell with irregular, mostly pentagonal 

 meshes, the bars of which bear the same verticils, each composed of three thin, tridentate anchor- 

 threads. At each nodal point arises a slender radial spine, which bears six verticils, each 

 composed of three to five lateral branches. 



Dimensions. Diameter of the inner shell 0'5, of the outer 3'0. 



Habitat. Mediterranean, Messina (E. Hertwig), surface, 



2. Ccelacantha, mammillata, n. sp. 



Internal shell strongly mammillate, with sixty to eighty radial rods, which are densely studded 

 with cruciate verticils of quadridentate anchor-threads. External shell with irregular, mostly 



1 Ccdacantha = Hollow spine ; xoiXoV, a.r.ou/6<*. 

 (ZOOL. CHALL. EXP. PART XL. 1886.) Rr 206 



