1582 THE VOYAGE OF H.M.S. CHALLENGER. 



21. Aulographis dentata, n. sp. (PL 103, fig. 20). 



Radial tubes slender, cylindrical, equally broad, scarcely inflated at the distal end. Termina 

 branches six to eight, curved, disposed in a corona around a straight central branch, eight to ten 

 times as long as the tube is broad, amied with numerous stout recurved lateral denticles and with 

 a terminal spathilla of five or six recurved teeth. 



Dimensions. — Length of the tubes 1'5 to 2"5, breadth 0"03 ; branches 0'15 to 0*2 long. 



Habitat. — North Atlantic, Station 354, depth 1675 fathoms. 



22. Aulographis pulvinata, n. sp. {PI. 103, fig. 26). 



Eadial tubes club-shaped, straight, gradually thickened towards the distal end, which bears a 

 broad, circular, biconvex cushion. The margin of this cushion bears two alternating verticils of 

 radially divergent, straight, terminal branches, which are twice to three times as long as the tube is 

 broad. Each branch is armed with two opposite lateral rows of numerous small denticles, and 

 bears a terminal spathilla with six to eight recurved radial teeth. 



Dimensions. — Length of the tubes 2'0 to 2'4, distal breadth O'Oo to 0'07; branches OOS to 0'08 long. 



Habitat. — South-east Pacific (off Valparaiso), Station 298, depth 2225 fathoms. 



23. Aulographis tripentas, n. sp. (PI. 105, fig. 13, 13a). 



Radial tubes club-shaped, straight, thickened towards the inflated distal end, which bears three 

 alternatmg verticils of terminal branches, each with five radial branches. The ten Ijranches of the 

 inner and outer verticils are perradial, smooth ; the alternating five branches of the middle verticil 

 are armed with recurved lateral denticles. Each of the fifteen branches bears a terminal spathilla 

 with five to seven recurved teeth. 



Dimcnsiojis. — Length of the spines 2'0 to 2-5, distal breadth 003 to 0'06 ; branches 01 long. 



Habitat. — South-east Pacific (off Juan Fernandez), Station 299, depth 2160 fathoms. 



24. Aulographis verticillata, u. sp. (PL 105, fig. 12, 12rt). 



Radial tubes cylindrical, equally broad, with an inflated ellipsoidal knob at the distal end. This 

 knob bears twenty to thirty slender, slightly curved, terminal branches, which are regularly arranged 

 in five radial or meridional rows, and in four to six concentric verticils. The branches are five to 

 ten times as long as the tube is broad, and armed with two opposite rows of lateral denticles, and 

 with a terminal spathilla of six to eight recurved teeth. 



Dimensions. — Length of the tubes 1-5 to I'S, breadth O'Ol to 0-02; branches 0-5 to 1-0 long. 



Habitat. — South Pacific, Station 293, depth 2025 fathoms. 



25. A^Uographis serrulata, n. sp. (PL 103, fig. 27). 



Radial tubes club-shaped, curved, thickened towards the inflated ellipsoidal distal end, which 

 bears a bunch of fifteen to twenty-five terminal branches, arranged more or less regularly in radial 



