REPORT ON THE RADIOLARIA. 1161 



7. Bathropyramis ramosa, n. sp. (PL 54, fig. 4). 



Shell spiny, slenderly pyramidal, with three cortinar pores at the apex, and with nine (or some- 

 times eight or ten) strong radial beams, connected by fifteen to eighteen complete parallel rings. 

 Meshes subregular, square, increasuig gradually in size. Surface covered with forked or 

 irregidarly branched spines, arising from the nodal points. 



Dimensions. — Shell 0'3 long, 017 broad. 



Rahitat. — Tropical Atlantic, Station 347, depth 2250 fathoms. 



Genus 512. Cmclopyramis,^ Haeckel, 1881, Prodromus, p. 428. 



Definition. — A rchiphormida (vel Monocyrtida multiradiata aperta) with 

 simple, slender, pyramidal shell, and numerous radial beams (six to nine or more). 

 Network double, with a dehcate arachnoidal fenestration, filling up the large quadr- 

 angular meshes. 



The genus Clndoiyyramis differs from the preceding Bathropyramis in the 

 development of a \Qvy delicate secondary network, filling up the large quadrangular 

 meshes, which are produced by the crossing of the radial beams and the parallel 

 horizontal rings. It therefore bears the same relation to the preceding genus that 

 Plectopyramis does to Sethopyramis ; it is perhaps derived directly from the former 

 by loss of the small cephalis. 



1. Cinclopyi'amis crihcllum, n. sp. 



Cinclopyramiscrlhelluni= " Ladder of lattice-shape," Bury, 1862, Polycystins of Barbados, ^A. xii. 

 fig. 6. 



Shell slender, pyramidal, with six strong radial ribs, which are connected by twelve to sixteen 

 complete horizontal rings. Meshes trapezoidal, filled up by a vei'y dehcate and regular secondary 

 network with square porules (two to four horizontal threads in each larger mesh). 



Dimensions. — Shell 0-2 to O'S long, 012 to 016 broad. 



Rahitat. — Fossil in Barbados. 



2. Cinclopyramis infundihulum, n. sp. (PI. 54, fig. 7). 



SheU slender, pyi-amidal, with nine strong radial ribs, which are connected by eighteen to 

 twenty-foiu" complete horizontal rings. Meshes subregular square, filled up by a very dehcate and 

 recfular secondary network with square porules (ten to twelve horizontal threads in each larger 

 mesh). Apex of the pyramid with three very small cortinar pores. 



Dimensions. — SheU 0'3 to 04 long, 0"2 to 0'25 broad. 



Rahitat. — Tropical Atlantic, Station 338, depth 1990 fathoms. 



1 CMicfcipy'"'iis = Lattice-pyramid ; r-r/iodi, TrvQxftis. 

 (ZOOL. CHALL. EXP. — PAET XL. — 1886.) Er 146 



