REPORT ON THE RADIOLARIA. 1459 



Dimcmions. — Length of the shell (with four joints) 0-2, breadth 01. Length of the single 

 joints, a 0-02, h 0-05, c 0-06, d 0-07. 



Habitat. — South Pacific, Station 300, depth 1375 fathoms. 



2. Artophormis costata, n. sp. 



Shell spindle-shaped, rough, with six distinct strictures, three times as long as broad. The 

 length of the seven joints increases gradually ; the last joint is twice as long as the fifth. Six 

 prominent, radial ribs arise from the third stricture, and are prolonged into six slender, convergent, 

 conical feet, as long as the sixth joint. Cephalis hemispherical, with a pyramidal horn of twice 

 the length. Pores regular, circular. 



JDiincnsions. — Length of the shell (with seven joints) 0-24, breadth 0-08. Length of the last 

 joint 0'05. 



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



3. Artophormis barhadensis, Haeckel. 



Calocydas barhadensis, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, 

 Taf. xviii. fig. 8. 



Shell slenderly ovate, smooth, with three sharp strictures, twice as long as broad. Length of 

 the four joints = 1:2:3:2. Xine prominent longitudinal ribs arise from the third joint, and are 

 prolonged into nine slender, conical, little convergent feet. Cephalis hemispherical, with a conical 

 horn of the same length. Pores subregular, circular, twice as large in the third joint as in the 

 second ; the fourth joint bears above a cii-cle of nine very large pores (alternate with the nine 

 ribs), and below two or three circles of smaller pores (eighteen to twenty-seven in the circum- 

 ference). Mouth somewhat constricted. The figure of Ehrenberg is incomplete, the horn of the 

 cephalis and the nine feet being broken off. 



Bimcnsions. — Length of the shell (with four joints) 0"16, breadth 0'08. Length of the single 

 joints, a 0-02, b 0-04, c 0-06, d 0-04. 



Habitat. — Fossil in Barbados. 



Genus 639. Cyrtophormis,^ n. gen. 



Definition. — S tichophormida (vel Stichocyrtida multiradiata aperta) with 

 ovate or spindle-sliaped shell, without lateral ribs. Mouth constricted, with a corona 

 of terminal feet. 



The genus Cijrtophormis may be derived from the preceding Artophormis by 

 reduction of the lateral ribs, w^hilst the terminal feet (as their free prolongations) 

 remain, and form a corona around the mouth. Sometimes also each constriction bears 



1 (72/rto/;Aormis = Plaited -basket; «i/jTOf, (po^fii;. 



