REPORT ON THE RADIOLARIA. 1443 



1. Pteropilium sphinx, Haeckel. 



Pterocanium sphinx, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 255, 

 Taf. xvii. fig. 5. 



Shell slenderly conical, with three slight strictures. Each of the two last joints as long as 

 tlie two first joints togetlier. Cephalis hemispherical. Third joint with three prominent, divergent 

 ribs, which are prolonged along the fourth joint into three latticed, triangular wings, ending in 

 a free, strong, conical spine. Pores subregular, circular, twice as broad in the fourth joint 

 as in the third, and three times as broad as in the second joint. 



Bimensioiis. — Length of the shell (with four joints) 0"15, of the single joints, a Q-Q2, b 0'03, 

 '■ 0-05, d 0-05 ; breadth of the third joint 0-09, of the fourth joint 0-06. 



Habitat. — Fossil in Barbados. 



2. Pteropilium hombus, Haeckel. 



Pterocanium hombus, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berhn, p. 82, 

 Taf. xvii. fig. 4. 



Shell broadly conical, with three deep strictures. Length and breadth of the four joints, 

 gradually increasing gi'ving the proportion 2:4:5:6. Cephalis hemispherical, second joint with 

 three prominent ribs, which are prolonged along the third and fourth joints into three slender, 

 triangular pointed wings, with few pores at the base. Pores of the shell subregular, circular. 



Dimensions. — Length of the .shell (with four joints) 0"17, of the single joints, a 0-02, b 0'04, 

 c 0-05, d 0-06 ; basal breadth Oil. 



Habitat. — Fossil in Barbados. 



3. Pterop>ilium pyramis, n. sp. 



Shell three-sided, pyramidal, with five deep strictures. Length and breadth of the six joints 

 gradually increasing towards the wide mouth. Cephalis subconical. Along the four first joints 

 arise three slender, divergent ribs, which at the fifth joint become three free, triangular, latticed 

 wings, with long, descending, terminal spines. The sixth joint is free, without wings. Pores 

 irregular, roundish. 



Dimensions. — Length of the shell (with six joints) 0-2, basal breadth 0'2. 



Habitat. — Central Pacific, Station 265, depth 2900 fathoms. 



Genus 629. Stichocampe,^ Haeckel, 1881, Prodromus, p. 439. 



Definition. — S tichopilida (vel Stichocyrtida triradiata aperta) with three solid 

 lateral ribs or wings, which are prolonged into three solid terminal feet. Cephalis with 

 a horn. 



1 SticAocamT^e = CaterpiEar with a row of joints; (tt/xos, x.afivn. 



