EEPORT ON THE RADIOLARIA. 1393 



gonal pores, and a terminal row of very small square pores. Lumbar and terminal coronals of similar 

 shape, each with twenty to thirty short divergent feet. 



Dimensions. Length of the three joints, a 0'02, b 0'06, c 004; breadth, a 0'025, b 0'08, c 0'08. 



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



2. Diplocyclas bicincta, n. sp. 



Shell campanulate, in general of the same form as, and similar fenestration to, the preceding species 

 but not so slender, and with different proportions. Length of the three joints = 1:4:2, breadth = 

 2:5:5. Cephalis hemispherical, with a single, conical, simple horn. Pores of the thorax hexa- 

 gonal, of increasing size (in eight to ten transverse rows). Abdomen with smaller square pores (in 

 four to six rows). The two coronals of the same shape as in PL 59, fig. 8. 



Dimensions. Length of the three joints, a 0'02, b 0'08, c 0'04 ; breadth, a (V04, I 01, c 01. 



Habitat. North Pacific, Station 253, depth 3125 fathoms. 



3. Didocyclas bizonalis, n. sp. 



Shell snbconical, with indistinct collar and distinct lumbar stricture. Length of the three 

 joints =1:2:3, breadth = 1:3:4. Cephalis hemispherical, with two divergent conical horns of 

 equal size. Thorax conical, with small, irregular, roundish, double-edged pores, and a terminal 

 corona of about nine very large pores. Abdomen truncate, conical, with three to four transverse 

 rows of roundish, quadrangular, very large pores. Lumbar and terminal coronals of similar shape, 

 each with twelve to fifteen triangular divergent feet. 



Dimensions. Length of the three joints, a 0'02, b 0'04, c 0'06 ; breadth, a 0'02, b 0'06, c 0'08. 



Habitat. South Pacific, Station 295, depth 1500 fathoms. 



% 



Subfamily 2. THEOPH^NIDA, Haeckel, 1881, Prodromus, p. 437. 



Definition. Phor m ocy rtida with the basal mouth of the shell fenestrated 

 (vel Tricyrtida multiradiata clausa). 



Genus 609. Hexalatractus, 1 n. gen. 



Definition. T heophasnida (vel Tricyrtida multiradiata clausa) with six lateral 

 wings on the abdomen. 



The genus Hexalatractus, and the following genus Theophcena, represent together 

 the small subfamily Theophaenida, or those Tricyrtida in which the terminal mouth of 

 the shell is closed by lattice-work, and six or nine lateral apophyses indicate a multi- 

 radiate structure. The shell is more or less ovate or spindle-shaped, tapering towards 



1 Hexalatract us = Spindle with six wings ; e|x, akjaxTOf. 

 (ZOOL. CHALL. EXP. PART XL. 1886.) Rr ] 75 



