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



3. Ethmosph(Bra polysiphonia, n. sp. (PL 12, fig. G). 



Tubuli couical, theii- outer opening three-fourths as broad as the inner and three times as 

 broad as their height. Sixteen to eighteen pores on the quadrant. Diameter of tire outer pores 

 three times as large as tlieir distance apart. 



Dimensions. — Diameter of the shell 0'2, outer pores 0"008, their distance 0-003. 



Habitat. — West Tropical Pacific, Station 225, depth 44*75 fathoms ; also fossil in Barbados and 

 in Sicily. 



Subgenus 2. Etlimosphcsr omnia, Haeckel. 



Definition. — Tubuli cylindrical, tlieir outer opening about as large as the inner. 



4. EthmosphcEra stenosiphonia, n. sp. 



Tubuli cylindrical, short, quite contiguous, so that their diameter is six times as large as their 

 distance apart, but about equal to their height. Nine to ten pores on the quadrant. 

 Dimensions.— Diameter of the shell 0'14, outer pores 0'012, their distance 0-002. 

 Habitat. — Central Pacific, Station 2*71, surface. 



5. EthmosphcBra pachysiphonia, n. sp. 



Tubiili cylindrical, twice as long as broad, very thick-walled, and nearly contiguous, so that 

 their diameter is five times as large as their distance apart. The thickness of their wall is equal to 

 their lumen. Twelve to fourteen pores on the quadrant. 



Dimensions. — Diameter of the shell 0'16, outer pores O'Ol, their distance 0'002. 



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



6. EthmosphcBra leptosiphonia, n. sp. 



Tubuli cylindrical, short, about as long as broad, very thin-walled and fragile, separated by wide 

 distances, which are three times as large as their diameter. Six to seven pores on the quadrant. 

 (Very similar to Siphonosphmra cyathina, PI. 6, fig. 10, but quite regular, all tuljuli retaining the 

 same size and distance.) 



Dimensions. — Diameter of the shell 0'12, outer pores O'Ol, their distance 0'03. 



Habitat. — North Atlantic, Fseroe Channel, John Murray ; surface. 



7. EthmosphcBra macrosiphonia, n. sp. 



Tubuli cylindrical, very elongated, four times as long as broad ; theii' bases separated by 

 distances which are equal to their breadth. Eight to ten tubuli on the quadrant. (The tubes are 

 similar to those of Siphonosphmra scrpula, PI. 6, fig. 6, but quite regular, straight, not curved, all of 

 the same size and at equal distances apart.) 



