1498 THE VOYAGE OF H.M.S. CHALLENGER. 



6. Eusyringium Jistidigerum, Haeckel. 



Euajrtidium fistulicjerum, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, 

 Taf. ix. fig. 3. 



Shell with four joints, thin-walled, smooth. Cephalis subspherical, with numerous very small pores, 

 and a stout, pyramidal horn of the same length. Thorax hemispherical. Third joint subspherical, 

 four times as long as the thorax, and of the same length as the slender, inversely conical or cylindrical, 

 fourth joint. Pores irregular, roundish or circular, in the fourth joint twice as broad as in the two 

 preceding joints. 



Dimensions. — Length of the shell (with four joints) 0'2. Length of the single joints, a 0'02, 

 6 0-02, c 0-08, d 0-08 ; breadth 0-09. 



Habitat. — Fossil in Barbados. 



Subgenus 2. Eusyringoma, Haeckel. 



Definition. — Shell with four or more strictures, and five or more joints ; the last joint 

 is strongly constricted, and forms a narrow cylindrical tube. 



7. Eusyringium lagenoides, Haeckel. 



Eucyrtidium lagenoides, Stobi-, 1880, Palceontogr., vol. xxvi. p. 104, Taf. iv. fig. 8. 



Shell with five joints, and four sharp strictures, nearly spindle-shaped. The third joint is twice 

 as long as the second and the fourth. Cephalis small, cap-shaped, with a thin conical horn of the 

 same length. The fifth joint is in Stohr's figure broken off, but well conserved in a specimen from 

 Caltanisetta, and represents a slender cylindrical tube, with few pores, half as long as the shell. 

 Pores small, subregular, circular, quincuncial. 



Dimensions — Length of the sheU (with five joints) 0'24, breadth 0'08 ; length of the third 

 joint 0-06, of the second and the fourth 0-03, of the fifth 01 ; breadth of the basal tube 0-027. 



Habitat. — Fossil in Tertiary rocks of Sicily (Grotte, Caltanisetta). 



8. Eusyringium rliaphanus, Haeckel. 



EvM/rtidium rhaphanus, Stohr, 1880, Palseontogr., vol. xxvi. p. 106, Taf. iv. fig. 12. 



Shell with six or seven joints of very different lengths, in the upper half campanulate, in the 

 lower cylindrical. The second and the two last joints are the longest. Cephalis smaU, subspherical, 

 with a short conical horn. The last joint is a narrow cylindrical tube of variable length, scarcely one- 

 fourth as broad as the preceding joints. Pores in the upper joints regular, circulai, in the lower 

 irregular, roundish. 



Dimensions. — Length of the shell (with seven joints) 0-2, breadth 01; length of the second and 

 last joints 0-03 to 0-04 ; breadth of the basal tube 0-025. 



Habitat. — Fossil in Tertiary rocks of Sicily (Grotte). 



