1516 THE VOYAGE OF H.M.S. CHALLENGER. 



3. Stichocapsa tricincta, n. sp. (PI. 78, fig. 2). 



Shell smooth, spindle-shaped, twice as long as broad, with three deep strictures. Length of the 

 four joints = 2 : 5 : 5 : 10. The third joint is the broadest. Fourth joint inversely conical, with acute 

 basal pole. Cephalis small, subconical. Pores irregular, roundish, of very different sizes. 



Dimensions. Length of the shell Oil. Length of the single joints, a O'Ol, 6 0'025, c 0'025, 

 d 0-05 ; breadth 0-055. 



Habitat. Central Pacific, Station 268, depth 2900 fathoms. 



4. Stichocapsa subglobosa, n. sp. 



Shell thorny, broad, pear-shaped, nearly spherical, almost as broad as long, with three internal 

 septal rings. Length of the four joints = 1:2:7:2. Cephalis small, subspherical. Thorax flat, 

 conical. Third joint very large, inflated, about twice as broad as the second and fourth joints. The 

 latter is flat, cap-shaped, with rounded basal pole. Pores regular, circular, hexagonally framed, in 

 the third joint twice as broad as in the second and fourth joints. 



Dimensions. Length of the shell 0'24. Length of the single joints, a 0'02, 5 0'04, c 014, d 0'04 ; 

 breadth 0'2. 



Habitat. Central Pacific, Station 265, depth 2900 fathoms. 



5. Stichocapsa compressa, Haeckel. 



Lithocampe compressa, Stohr, 1880, Palasontogr., vol. xxvi. p. 103, Taf. iv. fig. 5. 



Shell rough, broad, pear-shaped, almost as broad as long, with three internal septal rings. 

 Length of the four joints = 1:2:3:2. Cephalis very small, spherical. Thorax conical. The 

 third joint is the broadest, strongly inflated. The fourth joint (in the figure of Stohr broken off) is 

 in a well preserved specimen inversely hemispherical, with rounded basal pole. Pores very small, 

 regular, circular. 



Dimensions. Length of the shell 01. Length of the single joints, a 0'013, & 0'027, c 0'04, 

 d 0-022 ; breadth 0'08. 



Habitat. Fossil in Tertiary racks of Sicily ; Grotte, Caltanisetta. 



6. Stichocapsa pyriformis, n. sp. 



Shell rough, pear-shaped, about twice as long as broad, with three internal septal rings. 

 Length of the four joints = 2:5:2:9. Cephalis small, spherical, hyaline. Thorax conical. Third 

 joint very short and broad ; the fourth joint is the broadest, half as long as the shell, with an 

 inversely hemispherical basal pole. Pores subregular, circular, small and numerous, larger in the 

 basal third. 



Dimensions. Length of the shell 018. Length of the single joints, a - 02, & 0'05, c 0'02, d 0'09 ; 

 breadth 01. 



Habitat. Fossil in Barbados. 



