1278 THE VOYAGE OF H.M.S. CHALLENGER. 



as broad as the thorax, with twenty-four to thirty slender, convergent feet, which are as long as 

 the entire shell, with their edges in close contact and their distal ends pointed. 



Dimensions. — Cephalis 0-03 long, 0-05 broad ; thorax 0-12 long, 0-12 broad. 



Habitat. —Central Pacific, Stations 265 to 274, depth 2350 to 2925 fathoms. 



Genus 568. Anthocyrtidium,^ Haeckel, 1881, Prodromus, p. 431. 



Definition. — S e t h o p h o r m i d a, (vel Dicyrtida multiradiata aperta) without 

 thoracic ribs, with numerous (twelve to fifteen or more) subterminal feet, which are 

 separated from the constricted mouth by a ring of lattice-work. Cephalis free, with 

 an apical horn. 



The genus Anthocyrtidiuvi has been derived from the preceding Anthocyrtium l;>y 

 further growth and constriction of the peristome, which becomes separated from the 

 subterminal corona of feet by a more or less broad ring of lattice-work. 



1. Anthocyrtidium cineraria, n. sp. (PI. 62, fig. 16). 



Shell campanulate, smooth, with obliterated collar stricture. Length of the two joints = 5 : 11, 

 breadth = 3 : 13. Cephalis subcylindrical-ovate, with a conical straight horn of half the length. 

 Thorax hemispherical, inflated, nearly twice as broad as the constricted mouth. Pores subregular, 

 circular, double-contoured. Above the mouth, separated from it by two rows of pores, a corona 

 of twelve to fifteen short conical feet, which are directed downwards, slightly curved, and as long 

 as the cephalic horn. 



Dimensions. — Cephalis 0'05 long, 0'03 broad; thorax Oil long, 0'13 broad. 



Habitat. — Central Pacific, Station 271, depth 2425 fathoms. 



2. Anthocyrtidium ligularia, n. sp. (PL 62, fig. 15). 



Shell campanulate, rough, with distinct collar stricture. Length of the two joints = 1:4, 

 breadth = 2:6. Cephalis hemispherical, with a slender, conical, slightly curved horn, about as long 

 as the shell. Thorax hemispherical, three times as broad as the cephalis, nearly twice as broad as 

 the constricted mouth, which is prolonged into a prominent smooth ring. Above the mouth, 

 separated from it by one row of pores, a corona of twelve to fifteen slender linear feet, .which axe 

 shghtly curved, divergent, and emarginate at the truncated distal end. 



Dimensions. — Cephalis 0015 long, 0'03 broad ; thorax 0-06 long, 0'09 broad. 

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



' Anthocyrtidium =SiiKin flower-basket ; xuh;, x^frjojoi/. 



