1226 THE VOYAGE OF H.M.S. CHALLENGER. 



number of scattered, conical, fenestrated protuberances. Three feet very large, prismatic, straight, 

 divergent, twice as Ions; as the thorax. 



Dimensions. — Cephalis O'Co long, 0-04 broad ; thorax 0-09 long, 0-12 broad. 



Habitat.— Sovih. Pacific, Station 253, depth 3125 fathoms. 



6. Lychnocanium carinatum, Elirenberg. 



Lyclmocanium carinatum, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss, Berlin, p. 78, Taf. 

 viii. fig. 5. 



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

 Cephalis subglobular, with a slender horn of the same length. Thorax conical, twice as broad as 

 the flat mouth, with fifteen to twenty prominent, longitudinal, divergent ribs, alternating with the 

 same number of rows of pores. Three feet slender, prismatic, straight, divergent, twice as long as 

 the thorax. 



Dimensions. — Cephalis 0'02 long, 0'02 broad ; thorax O'OG long, 0-06 broadi 



Habitat. — Possil in Barbados. 



7. Lychnocanium ventricosum, Ehrenberg. 



Lychnocanium ventricosum, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 80, Tat 

 vii. fig. 12. 



Shell pear-shajjed, rough, with deep collar stricture. Length of the two joints =1:3, breadth 

 = 1:4. Cephalis subglobular, with a stout conical horn twice the length. Thorax conical, 

 three times as broad as the constricted mouth, with irregular, roundish pores of different sizes. 

 Three feet stout, conical, divergent, half as long as the thorax. 



Dimensions. — Cephalis 0'02 long, 0'03 broad ; thorax 0'07 long, 0'09 broad. 



Hahitat. — Central Pacific, Stations 265 to 268, depth 2700 to 2900 fathoms ; fossil in Barbados. 



8. Lychnocanium trihulus, Ehrenberg, 



Lychnocanium trihulus, Ehrenberg, 1875, Abhandl d. k. Akad. d. Wiss. Berlin, p. 80, Taf. vii. 

 fig. 1. 



Shell pear-shaped, nodose, with distinct collar stricture. Length of the two joints = 1:4 

 breadth =1:4. Cephalis subglobular, with a conical horn twice the length. Thorax ovate, 

 twice as broad as the constricted mouth, with irregular, roundish pores of different sizes. Three 

 stout feet strongly divergent, pyramidal, about as long as the thorax. 



Dimensions. — Cephalis 0-02 long, 0-02 broad ; O'OS long, 0-08 broad. 



Hahitat. — Fossil in Barbados. 



Subgenus 2. Lychnocanissa, Haeckel. 



Definition. — Feet divergent, more or less curved ; their terminal distance greater 

 than their basal distance. 



