REPORT ON THE RADIOLARIA. 1493 



16. Eucyrtidium eruca, Ehrenberg. 



Eucyrtidium eruca, Ehrenberg, 1875, AbhanJl. d. k. Akad. d. Wiss. Berlin, p. 70, Taf. x. fig. 13. 



Shell smooth, slender, ovate, or nearly spindle-shaped, with four sharp strictures. Five joints 

 of different lengths, the third and fourth nearly equal, twice as long as the fifth, one and a half times 

 as long as the second ; the fourth joint is the broadest. Mouth little constricted. Cephalis sub- 

 spherical, with a small, conical horn. Pores small and numerous, subregular, circular. 



Dhncnsions. — Length of the shell (with five joints) 0-12 to 014 ; length of the third and the 

 fourth joints, 0-03 to 0-04, breadth 0-04 to 0-05. 



Habitat. — Cosmopolitan ; Atlantic, Pacific, in different depths ; also fossil in Barbados and 

 Sicily. 



17. Eucyrtidium montijyarum., Ehrenberg. 



Eucyrtidium montiparum, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 72, 

 Taf. ix. fig. 11. 



Shell rougli, nearly spindle-shaped, with five deep strictures. Six joints of different lengths, 

 the third and fourth nearly equal, longer than the fifth and the sixth joints ; the fourth joint is 

 the broadest. Mouth slightly constricted. Cephalis very small, hemispherical, hyaline, with a 

 short, conical horn. Pores subregular, circular, twice as broad as in the similar smaller preceding 

 species. 



BimensioTis. — Length of the shell (with six joints) 0"2 ; length of the third and the fourth joints 

 0-05, breadth 0-07 to 0-08. 



Habitat. — Fossil in Barbados. 



18. Eucyrtidium cienkowskii, n. sp. (PL 80, fig. 9). 



SheU smooth, subconical, with five distinct strictures. Six joints of different lengths ; the third 

 joint conical, one and a half to two times as long as each of the other joints ; the fifth joint is the 

 broadest. Mouth wide, very slightly constricted. CephaKs hemispherical, with an oblique pyra- 

 midal horn of the same length. Pores regular, circular, in dense transverse rows ; five to six rows 

 in each of the three last joints, eight to nine rows in the third joint. 



Dimensions. — Length of the shell (with six joints) 0"16, length of the third joint 0'04, of each 

 following joint 0'02 ; greatest breadth (in the fifth joint) O'OS. 



Habitat. — South Pacific, Station 295, depth 1500 fathoms. 



19. Eucyrtidium elongatum, Stohr. 



Eucyrtidium elongatum, Stohr, 1880, PaL-eontogr., vol. xxvi. p. 105, Taf. iv. fig. 10. 



SheU rough, slender, nearly spindle-shaped, variable in size and form, with six to seven distinct 

 strictures. Seven to eight joints of different lengths, often alternately longer and shorter. The second 



