1702 THE VOYAGE OF H.M.S. CHALLEKGER. 



4. Haecheliana murrayana, Haeckel. 



Challengeria sp., John Murray, 1876, Proc. Roy. Soc, vol. xxiv. pi. xxiv. fig. G. 



Shell with twenty to twenty-five coronets, the majority of which have five pores (more rarely 

 four or six). Coronets of about the same breadth as their intervals, and twice as broad as the 

 by-spines. Dimples subcircular, of about the same breadth as the pores. Radial main-spines about 

 as long as the radius. 



Dimensions.— JyiSim&i&x of the shell 0-35 to 04, of the coronets 0'06 to 0-07. 



Habitat. — Central Pacific, Stations 271 to 274, depth 2350 to 2750 fathoms. 



5. Haeckeliana goetheana, n. sp. (PL 1 14, fig. 3). 



Shell with sixteen to twenty coronets, the majority of which have four pores (more rarely five 

 and very rarely six). Coronets smaller than their intervals. By-spines very short or rudimentary. 

 Dimples subcircular, half as broad as the pores. Radial main-spines shorter than the radius. 



Dimensions. — Diameter of the shell 0-25 to 0'3, of the coronets 0'04 to O^OS. 



Hahitat. — North Pacific (south of Japan), Station 231, depth 2250 fathoms. 



6. Haeckeliana darwiniana, u. sp. (PL 114, figs. 1, 2). 



Shell with twenty-six to thirty-two coronets, the majority of which have five pores (rarely four 

 or six). Coronets smaller than their intervals and than the length of the by-spines. Dimples 

 subcircular, half as broad as the pores. Radial main-spines longer, than the radius. 



Dimensions. — Diameter of the shell 0'30 to 0'42, of the coronets 0'07 to 0'08. 



Habitat. — North Pacific (east of Japan), Stations 241 to 245, depth 2300 to 2900 fathoms. 



Family LXXXIL T u s c a r o R i d A, u. fam. (PL 100). 



Definition. — PniEODARiA with an ovate, spindle-shaped, or nearly spherical shell 

 exhibiting a peculiar solid porcellanous structure; with a few radial pores around the base 

 of the hollow tubules, which are symmetrically arranged around the main axis and the 

 mouth. Surface of the shell smooth or spiny, not tabulate nor panelled. Central 

 capsule excentric, placed in the aboral half of the shell-cavity. 



The Tuscarorida, and the preceding closely allied family, the Circoporida, 

 represent together a pecuhar small group, which differs from the other Ph/EODARIA in 

 the singular porcellanous structure of the shell-wall, and may be called Phseocalpia; 

 their hollow radial spines are distinguished by peculiar basal pores, forming a circle 

 around their- base. The shell of the Tuscarorida is monaxonian, cJvate, spindle-shaped 



