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



3. Stichocapsa tricincta, n. sp. (PL 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, h 0'025, c 0"025, 

 d 0-05; breadth 0055. 



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



4. Stichocapsa suhglobosa, 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, h 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, Palaeontogr., 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 O'OIS, h 0'027, c 0^04, 

 d 0-022 ; breadth 0-08. 



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



6. Stichocajisa p>yriformis, 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 0-02, h 0-05, c 0-02, d O'OO ; 

 breadth 01. 



Habitat. — Fossil in Barbados. 



