1274 THE VOYAGE OF H.M.S. CHALLENGEE. 



twenty divergent, broad, lamellar, rectangular feet, as long as the thorax, and so densely placed 

 that their margins come in contact with one another. 



Dhnensions. — Cephalis 0'03 long, 0'04 broad ; thorax 01 long, 012 broad. 



Habitat. — ^Central Pacific, Station 263 to 268, depth 2650 to 3000 fathoms. 



6. Anthocyrtium anemone, n. sp. 



Shell spiny, with sharp collar stricture. Length of the two joints = 1:5, breadth =1:4. 

 Cephalis subspherical, with a conical horn of half the length, hyaline, without pores. Thorax 

 spiny, pear-shaped, inflated, with small and numerous, regular, circular pores. Mouth constricted, 

 half as broad as the thorax, with twelve to fifteen divergent, slender, conical, denticulate feet, half 

 as long as the thorax. 



Dimensions. — Cephalis 0'03 long, 0'04 broad ; thorax 014 long, 012 broad. 



Habitat. — Tropical Atlantic, Station, 347, depth 2250 fathoms ; also fossil in Barbados. 



Subgenus 2. Anthocyrtonium, Haeckel. 



Definition. — Feet of the peristome-coroua parallel, vertical ; their basal and apical 

 distances equal. 



7. Anthocyrtium campanula, n. sp. (PI. 62, fig. 17). 



Shell smooth, with deep collar stricture. Length of the two joints = 1 : 3, breadth = 1 : 3. 

 Cephalis spherical, with a conical horn of the same length. Thorax campanulate, thin-walled, with 

 delicate network of regular, hexagonal pores and thin bars. Mouth little constricted, with twenty 

 to twenty-four parallel, vertical, lanceolate feet, about as long as the cephalis. 



Dimensions. — Cephalis 0'03 diameter, thorax O^OO long, 01 broad. 



Habitat. — South Pacific, Station 302, depth 1450 fathoms. 



8. Anthocyrtium reticulattim, Haeckel. 



Tliyrsocyrtis retieuluta, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 84, Taf. xii. 

 fig. 10. 



Shell rough, with sharp collar stricture. Length of the two joints =1:2, breadth = 1:3. 

 Cephalis hemispherical, with a prismatic, denticulate horn of the same length, and small, irregular 

 pores. Thorax campanulate, thorny, tliin-walled, with delicate network of irregular, polygonal pores. 

 Mouth little constricted, with twelve (or more) small, parallel, vertical, triangular feet, shorter than 

 the cephalis. 



Dimensions. — Cephalis 0-015 long, 0-02 broad ; thorax 0'04 long, 0'06 broad. 



Habitat. — Fossil in Barbados. 



