1174 THE VOYAGE OF H.M.S. CHALLENGER. 



2. PhcBnocaljns ocellata, Haeckel. 



Petalospyris ocellata, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 80, Taf. xxii. 

 fig. 9. 



Shell subspherical, smooth, with irregular roundish pores, about as broad as the bars. 

 Columella slightly curved aud excentric, prolonged into a slender conical horn of the same length. 

 Six l^asal feet similar to the horn, slightly divergent. 



Dimensions. — Shell 0'06 long, 0'07 broad ; horn and feet 0'05 long. 



Habitat. — Fossil in Barbados. 



3. Plumiocalpis carinata, Haeckel. 



Fefalonpi/ris carinafa, Ehrenberg, 187.5, Abhamll. d. k. Akad. d. Wiss. Berlin, p. 80, Taf. xxii. 

 fig. 6. 



Shell campanulate, rough, with irregular roundish pores, smaller than the bars. Columella 

 straight, central, prolonged into a stout conical horn of the same length. Nine basal feet slender, 

 triangular, longer than the shell, nearly vertical, with a middle rib in the basal half. 



Dimensions.' — Shell 0'05 long, 0'06 broad ; horn 0'04 long, feet 0'08 long. 



Habitat. — -Fossil in Barbados. 



4. Phcenocalpis Jlabellum, Haeckel. 



Petalospuris flahelluin, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, Taf. xxii. fig. 7. 



Shell campanulate smooth, with very small circular pores, half as broad as the bars. Columella 

 straight, central, prolonged into a pyramidal horn of half the length. Twelve to fifteen basal feet 

 lamellar, linear, twice to three times as long as the shell, parallel and vertical, pointed at the distal 

 end. 



Dimensions. — Shell O'Oi long, 0'05 broad ; horn 0'02 long, feet O'l to 0'12 long. 



Habitat. — Fossil in Barbados. 



Genus 523. Phmiosceniutn,^ u. gen. 



Definition. — A rchiphaenida (vel Monocyrtida multiradiata clausa) with an 

 internal axial branched columella, prolonged outside into an apical horn. 



The genus Phcenoscenium differs from the preceding Phcenocalpis in the branched 

 columella, which is connected by three or six ascending branches with the inner wall of 

 the shell. It bears therefore to the latter the same relation that Cladoscenium exhibits 

 to Euscenium. The former genera may have been derived from the latter by inter- 

 polation of new interradial feet between the three primary perradial feet. 



' Pft.a7j.osc6m«TO = Tent-shaped shell ; ^ahx., cKnvio'j. 



