REPORT ON THE RADIOLARIA. 1173 



denticulate bars. Outer spongy shell very delicate, arachnoidal, with numerous prominent conical 

 spongy papillae. Central capsule ellipsoidal, half as long and broad as the shell. 



Dimensions. Shell 0'46 long, O32 broad ; mouth 0'045 broad. 



Habitat. Central Pacific, Stations 271 to 274, surface. 



2. Arachnocalpis sphceroides, n. sp. 



Shell spheroidal, of the same structure as the preceding ellipsoidal species, with the same form of 

 the spongy envelope ; differing from it in the globose form and the shorter peristome, bearing only 

 nine or ten small conical divergent teeth. Central capsule spherical. 



Dimensions. Shell 0'3 diameter, mouth 0'04 broad. 



Habitat. Central Pacific, Stations 265 to 270, surface. 



Subfamily 2. ARCHIPH^NIDA, Haeckel, 1881, Prodromus, p. 429. 



Definition. P hsenocalpida with the basal mouth of the shell fenestrated 

 (vel Monocyrtida multiradiata clausa). 



Genus 522. Phcenocalpis, 1 n. gen. 



Definition. A rchiperida (vel Monocyrtida multiradiata clausa) with an 

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



The genus Phcenocalpis and the following Phcenoscenium comprise those Archi- 

 phsenida in which the vertical axis of the shell -cavity is occupied by a simple or 

 branched columella, arising from the centre of the base and prolonged into an apical 

 horn. This columella may be either the vertical rod of a Plectaniscus or the remnant 

 of an original ring of Petalospyris. The latter genus differs by its sagittal constriction. 



1. Phcenocalpis petalospyris, n. sp. (PL 97, fig. 4). 



Shell subspherical, rough, with irregular, roundish pores, larger than the bars. Columella 

 straight, central, thin, prolonged into a large apical horn with three dentate edges. Six basal feet 

 curved, divergent, lamellar, with a middle rib and dentate edges. 



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



Habitat. Tropical Atlantic, Station 347, depth 2250 fathoms. 



1 Ph&nocalpis = Urceolate shell ; <p*i>a, xaXx/f. 



