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



1. Trypanosphcera trepanata, n. sp. (PI. 5, fig. 4). 



Shell regular spherical, with regular circular pores of nearly equal size, at unequal distances, one 

 to four times as broad as the bars. Eight to ten pores on the half meridian. All the pores prolonged 

 into short cylindrical tubuli about as long as broad, armed on the external mouth with an elegant, 

 coronal of twenty to thirty straight bristle-shaped, parallel teeth. 



Dimensions. Diameter of the shell 012 to 014, of the pores 0'015 to 0'02 ; length of the 

 tubuli 0'02. 



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



2. Trypanosphcera dentata, n. sp. 



Shell regular spherical, with regular circular pores of equal size, but at very different distances. 

 Only three to four pores on the half meridian. All the pores prolonged into irregular curved, cylin- 

 drical tubuli, about as long as the shell radius, with a coronal of ten to twelve short conical teeth 

 on the distal end. 



Dimensions. Diameter of the shell 0'08 to 0'09 ; length of the tubuli 0'04, breadth 0'02. 



Habitat. Central Pacific, Station 274, depth 2750 fathoms. 



Subgenus 2. Trypanoaphferium, Haeckel. 

 Definition. Only part of the shell -pores prolonged into coronated tubules. 



3. Trypanosphcera coronata, n. sp. (PI. 5, fig. 3). 



Shell regular spherical, with irregular roundish pores of very different sizes. On the half meridian 

 four to six large and twelve to sixteen very small pores. About half of the large pores pro- 

 longed into short cylindrical tubuli, the outer mouth of each being armed with an elegant coronal 

 of ten to twenty thin irregular teeth. 



Dimensions. Diameter of the shell 01 to 012, of the large pores O'Ol to 0'02, of the small 

 pores O'OOl ; length of the tubuli 0'012. 



Habitat. North Pacific, Station 241, depth 2300 fathoms. 



4. Trypanosphcera terebrata, n. sp. 



Shell irregular roundish, with unequal, small, roundish pores. Sixteen to twenty pores on the half 

 meridian. Six to eight larger pores are prolonged into curved cylindrical tubuli, about as long as the 

 shell radius, with a coronal of ten to twelve strong conical straight teeth on the distal end. 



Dimensions. Diameter of the shell 015, of the pores O'OOl to 0'003 ; length of the tubuli 

 0'08, breadth 0'02. 



Habitat. West Tropical Pacific, Station 225, depth 4575 fathoms. 



