REPORT ON THE RADIOL A.RIA. 1047 



secondary or interradial ; an odd sternal foot (opposed to the odd caudal) and two 

 paired tergal feet (opposed to the two paired pectoral). 



Subgenus 1. Hexaspyridium, Haeckel. 

 Definition. — Feet simple, not branched nor forked. 



1. Hexaspyris alterna, n. sp. 



Shell nut-shaped, smooth, with deep sagittal stricture and irregular polygonal pores ; on each 

 side of the stricture two pairs of larger square annular pores. Basal plate also with four larger 

 collar pores. Apical horn twice as long as the shell, conical. Three primary feet (the apical and 

 the two pectoral) slender, curved, as long as the horn ; three secondary feet (the sternal and the 

 two tergal) are half as long as the former and more highly inserted ; all six feet strongly divergent, 

 cylindrical, pointed. 



Dimensions. — SheU 0'06 long, 0-09 broad; horn 015 long, feet 0'08 to 014 long. 



Habitat. — Central Pacific, Stations 265 to 268, depth 2700 to 2900 fathoms. 



2. Hexaspyris setigera, Haeckel. 



Ceratoifpyris setigera, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. xx. 



fig. 11. 

 Ceratospyris setigera, Biitschli, 1882, Zeitschi'. f. wis.'!. Zool., vol. xxxvi. p. 539, Taf. xxxii- 



figs. 11a, 11 J. 



SheU nut-shaped, tuberculate, with a complete internal sagittal ring and numerous small circular 

 pores. Basal plate with four larger central and a circle of twelve to twenty smaller peripheral 

 pores. Apical horn half as long as the shell, bristle-shaped. Three prunary feet longer and more 

 deeply inserted than the three secondary feet; all six feet strongly divergent, bristle-shaped, shorter 

 than the shell. 



Dimensions. — Shell G'06 long, 0'09 broad ; horn 0'03 long ; primary feet 0'05, secondary 

 0-02 long. 



Habitat. — Fossil in Barbados. 



3. Hexaspyris biitschlii, Haeckel. 



Ceratospyris trionnna, Biitschli (no7i Ehrenberg), 1882, Zeitschr. f. wiss. Zoo!., vol. xxxvi. 

 p. 539, Taf. xxxii. fig. 12, a, b. 



Shell nut-shaped, spinulate, with a complete internal sagittal ring and subregular circular pores. 

 Basal plate with twelve pores (four larger central and eight smaller peripheral). Apical horn stout, 

 oblique, as long as the shell. Six feet of equal length, shghtly divergent, nearly vertical, slender 

 three to four times as long as the shell. 



Dimensions. — SheU O'Oo long, 0'07 broad ; horn 0'06, feet 015 to 0^2 long. 



Habitat. — FossU in Barbados. 



