REPORT ON THE RADIOLARIA. 1183 



Subgenus 3. Cornutosa, Haeckel, 1881, Prodromus, p. 427. 

 Definition. Axis of the conical shell curved. Pores circular or roundish. 



11. Cornutella curvata, Haeckel. 



Cornutella dathrata, var., Ehrenberg, 1854, Mikrogeol., Taf. xxii. figs. 39a, b, c. 

 Cornutosa dathrata, Haeckel, 1881, Prodromus, p. 427. 



Shell slender, conical, with curved axis ; the curve lies in one plane and is not spirally 

 convoluted. Pores subregular, circular, of nearly equal size, quincuncially disposed. Horn short, 

 conical. 



Dimensions. Shell 01 to 015 long, 0'04 to 0'06 broad. 



Habitat. Fossil in tertiary rocks of Sicily (Caltanisetta). 



12. Cornutella spiralis, n. sp. 



Cornutura qriralis, Haeckel, 1881, Prodromus, p. 427. 



Shell slender, conical, nearly cylindrical, very long, spirally contorted ; its axis is an ascending 

 spiral line with two or three windings, widely distant. Pores irregular, square, small and numerous. 

 Dimensio'ns. Shell 0'2 to 0'25 long, 0'05 to 0'08 broad. 

 Habitat. Central Pacific, Station 271, depth 2425 fathoms. 



Genus 527. Cornutanna, 1 Haeckel, 1881, Prodromus, p. 427. 



Definition. A rchicorida with conical shell, gradually dilated towards the wide 

 open mouth. Apex without horn. 



The genus Cornutanna has the same simple conical shell as the preceding 

 Cornutella, but differs from it in the total absence of an apical horn. It bears there- 

 fore to the latter the same relation that Cyrtocalpis does to Archicorys. It may be 

 derived from Sethoconus by complete reduction of the cephalis and its horn. 



1. Cornutanna orthoconus, n. sp. 



Shell slender, conical,* with straight axis and straight outlines. Pores subregular, circular, 

 quincuncially disposed in nine to twelve alternating longitudinal series, gradually increasing in size 

 towards the mouth. 



Dimensions. Shell 01 to 012 long. 0*03 to 0'04 broad. 



Habitat. Central Pacific, Stations 270 to 274, surface. 



1 Cornutanna = Horn-shaped ; Camilla. 



