706 THE VOYAGE OF H.M.S. CHALLENGER. 



7. Streblonia pulvinulina, u. sp. 



Shell top-shaped or liatly conical, with thirty to forty chambers of slowly increasing size, the 

 tenth chamber about three times as broad as the first. Breadth of the shell exceeds three times 

 the height. Pores circular, subregular, very small, about one-third as broad as the bars ; about 

 thirty in the breadth of the tenth chamber. (Eeseml)les closely Ptikinulina) 



Dimensions. — Breadth of the shell 0'25, height 0'08. 



Habitat. — Pacific, central area, Station 263, depth 2650 fathoms. 



Genus 311. Strehlacantha,^ u. gen. 



Definition. — S t rebl o nida with simple, spherical, subspherical, or lentelliptical 

 primordial chamber, beginning the screw -like series of spirally ascending chambers. 

 Surfece covered with radial spines. 



The genus Streblacantha differs from the nearly allied Strehlonia only in the 

 covering of radial spines, and bears therefore the same relation to it as Hastigerina 

 has to Glohigerina amongst the similar calcareous Polythalamia. 



1. Streblacantha .nderolina, n. sp. (PI. 49, figs. 8, 8ff). 

 Streblonia sidewlina, Haeckel, 1883, MS. 



Shell flatly conical, with fourteen to sixteen nearly hemispherical chambers of gradually increas- 

 ing size, the tenth chamber about six times as broad as the first. Breadth of the shell nearly equal 

 to the height. Pores subregular, circular, hexagonally framed, twice as broad as the bars ; about 

 nine pores on the breadth of the tenth chamber. Surface covered with numerous short conical 

 radial spines, one-fourth to one-sixth as long as the diameter of the shell. 



Dimensions. — Breadth of the shell 0'15, height 017. 



HaUtat. — South Pacific, Station 298, depth 2225 fathoms. 



2. Streblacantha calcariria, n. sp. 



Shell conical, with sixteen to eighteen roundish chambers of gradually increasing size, the 

 tenth chamber about three times as broad as the first. Breadth of the shell about one and a half 

 times the height. Pores irregular, roundish. Surface covered with numerous strong conical radial 

 spines, about half as long as the diameter of the shell. 



Dimensions. — Breadth of the shell 0'24, height 01 7. 



Habitat. — South Pacific, Station 285, depth 2375 fathoms. 



' StrchliicantlM = BcT.ew-she\l with spines ; irrff'/SX)), oixctuitt. 



