1178 THE VOYAGE OF H.M.S. CHALLENGER, 



Subgenus I. Coronopltcena, Haeckel, 1881, Prodromus, p. 429. 

 Definition. Feet simple, not branched nor forked. 



1. Archiphcena gorgospyris, n. sp. (PI. 98, figs. 10, 10a). 



Shell hemispherical, smooth, with small subregular, circular pores. Collar septum with four 

 large pores (fig. 10a). Twelve to fifteen feet, divergent, lamellar, truncate, about as long as the shell. 

 (Similar to certain forms of Gorgospyris, PI. 87, figs. 1 to 3, but with simple shell cavity, without 

 sagittal ring and constriction, and without a columella.) 



Dimensions. Shell 0'08 long, 0'04 broad; feet 0'03 to 0'04 long. 



Habitat. North Pacific, Station 244, depth 2900 fathoms. 



2. Archiphoena corona, n. sp. 



Shell crown-shaped, somewhat broader than long, at the base flattened, papillate, with irregular 

 roundish pores. Twenty to twenty-five feet, broad, lamellar, truncate, nearly vertical, about twice as 

 long as the shell. 



Dimensions. Shell 01 long, 012 broad; feet 0'2 to 0'22 long. 



Habitat. Central Pacific, Station 268, depth 2900 fathoms. 



Subgenus 2. Stephanophcena, Haeckel, 1881, Prodromus, p. 429. 

 Definition. Feet branched or forked. 



3. Archiphcena stephanoma, n. sp. 



Shell campanulate, somewhat longer than broad, with subregular, circular pores. Margin of the 

 flattened base with a corona of about twenty unequal feet, which are partly simple, partly irregularly 

 branched, and about as long as the shell. 



Dimensions. Shell Oil long, 0'03 broad ; feet 0'08 to 012 long. 



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



Family LXI. CYB.TOCALPIDA, n. fam. 



Archicorida et Arehicapsida, Haeckel, 1881, Prodromus, pp. 427, 428. 



Definition. M onocyrtida eradiata. (Cyrtoidea with a simple, not jointed 

 shell, representing a simple cephalis without radial apophyses.) 



The family Cyrtocalpida, composed of the Archicorida and Arehicapsida of my 



