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 euds pointed. 



Dimensions. Cephalis O03 long, 0'05 broad ; thorax 012 long, 012 broad. 



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



Genus 568. Anthocyrtidium, 1 Haeckel, 1881, Prodromus, p. 431. 



Definition. Sethophormida, (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 Anthocyrtidium has been derived from the preceding Anthocyrtium by 

 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, 013 broad. 



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



2. Anthocyrtidium 'ligularia, n. sp. (PI. 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 are 

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



Dimensions. Cephalis 0'015.1ong, 0'03 broad; thorax 0'06 long, 0:09 broad. 

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



1 Anthocyrtidium ='Small flower-basket ; Autos, wfriJiw. 



