REPORT ON THE RADIOLARIA. 981 



Subgenus 2. Tripocorouis, Haeckel, 1881, Prodromus, p. 445. 

 Definition. — Basal ring with three descending feet (one caudal and two pectoral). 



3. Podocoronis cortiniscus, n. sp. (PI. 97, fig. 2). 



Basal ring violin-shaped, with three straight divergent thorny feet, about as long as the ovate 

 sagittal ring. The dorsal part of the latter is straight, vertical, and prolonged downwards into the 

 caudal foot, upwards into a stout, thorny, vertical apical horn. The ventral part is semicircular 

 and gives off the lateral branches, forming the kidney-shaped sagittal ring. All the rings and 

 their apophyses are armed with stout thorns. This and the following tripodal species may be 

 directly derived from Cortina. 



Dimensions. — Height of the frontal ring O'l, breadth 0'15. 



Habitat. — Central Pacific, Station 274, depth 2750 fathoms. 



4. Podocoronis tripodiscus, n. sp. 



Basal ring kidney-shaped, with thi-ee large divergent curved feet, nearly twice as long as the 

 semicircular sagittal ring. The straight dorsal part of the latter is prolonged downwards into the 

 caudal foot, upwards into a large branched apical horn, curved backwards. Differs from the 

 preceding species mainly in the longer curved apophyses and in the larger violin-shaped frontal 

 ring. 



Dimensions. — Height of the frontal ring 0'12, breadth 0'2. 



Habitat. — North Pacific, Station 238, surface. 



Subgenus 3. Tetracoronis, Haeckel, 1881, Prodromus, p. 445. 

 Definition. — Basal ring with four descending feet (two sagittal and two lateral). 



5. Podocoronis tetrapodiscus, n. sp. 



Basal ring kidney-shaped, with four stout and straight divergent feet, about as long as the 

 sagittal ring ; two of them are lateral and arise from the basal corners of the vioUn-shaped frontal 

 ring (at its junction with the basal ring) ; two are sagittal, and arise from the basal corners of the 

 semicircular sagittal ring (one posterior caudal and one anterior sternal). The straight dorsal part 

 of the sagittal ring is prolonged upwards into an apical horn. All the rings are thorny. 



Dimensions. — Height of the frontal ring 015, breadth 0'25. 



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



Subgenus 4. Hexacoronis, Haeckel. 



Definition. — Basal riug with six radial descending feet (two sagittal, two pectoral, 

 and two tergal feet). 



