1466 THE VOYAGE OF H.M.S. CHALLENGED 



3. Stichophcena gcetheana, n. sp. 



Shell ovate, one and a half times as long as broad, rough, with five internal annular septa. The 

 six joints gradually increase in length and breadth. The last joint is the broadest, and half as long 

 as the five others together. The hemispherical cephalis bears a pyramidal horn of twice the length. 

 From the thorax arise nine radial ribs, which attain their greatest height in the fourth joint and 

 reach the fifth joint, but are not developed in the last ovate joint. Pores subregular, circular. 



Dimensions. Length of the shell (with six joints) 0'22, breadth 014. Length of the single 

 joints, a 0'02, b 0'025, c 003, d 0'035, e 0'04, / 0'7. 



Habitat. Central Pacific, Station 266, depth 2750 fathoms. 



Subgenus 2. Stichophcenoma, Haeckel. 



Definition. Last joint of the shell pointed, armed with a polar, basal spine, or a 

 bunch of spines. 



4. Stichophcena nonaria, n. sp. (PI. 76, fig. 6). 



Shell nearly spindle-shaped, with five or six distinct strictures. The third joint is the broadest 

 and longest, and twice as long as the second and the fifth joints. Along the second or third middle 

 joint (beginning from the second or third) descend nine prominent longitudinal ribs. Cephalis 

 hemispherical, with two short, conical, divergent horns. Last joint inversely conical, armed with 

 several strong, conical, divergent spines, 



Dimensions. Length of the shell (with seven joints) 0'23, of the third joint 0'05, of the last 

 0-04; breadth 01. 



Habitat. North Pacific, Station 244, depth 2900 fathoms. 



5. Stichophcena novena, n. sp. (PL 76, fig. 7). 



Shell nearly spindle-shaped, with eight or nine deep strictures. The third joint is the broadest, 

 campanulate, in its lower half with nine prominent ribs, which disappear beyond the third stricture. 

 The following joints are alternately longer and shorter, and decrease gradually in breadth. Thorax 

 hemispherical. Cephalis small, hemispherical, with a conical horn of the same length. Last 

 joint also hemispherical, scarcely larger than the cephalis, with a bunch of conical, divergent 

 spines. 



Dimensions. Length of the shell (with nine joints) 0'25, of the third joint 0'05, of the last 0'02; 

 breadth 01. 



Habitat. Central Pacific, Station 272, depth 2600 fathoms. 



