REPORT ON THE RADIOLARIA. 1345 



abdomen with about thirty longitudinal, divergent ribs, separating the same number of longitudinal 

 rows of regular, circular pores, the size of which increases gradually towards the base. Feet shovel- 

 shaped (broad, triangular, with convex outer and concave inner side, the obtuse end being curved 

 inwards), about as long as the short abdomen, only slightly convergent. 



Dimensions. Length of the three joints, a 0'04, b 012, c O04; breadth, a 0'04, b 012, c Oil. 



Habitat. Fossil in Barbados. 



27. Podocyrtis costata, n. sp. 



Shell ovate, smooth, of the same form and structure as Podocyrtis papalis, but with two 

 distinct strictures and different proportions. Length of the three joints =1:3:6, breadth 

 = 2:4:6. About thirty longitudinal ribs regularly alternating with rows of circular, regular 

 pores. Feet as in Podocyrtis papalis. 



Dimensions. Length of the three joints, a 0'02, b 0'06, c 012 ; breadth, a 0'04, b 0'08, c 012. 



Habitat. Central Pacific, Stations 266 to 272, depth 2425 to 2925 fathoms. 



28. Podocyrtis mitrella, Ehrenberg. 



Podocyrtis mitrella, Ehrenberg, 1875, Abhandl. d. k. Akad. d. "Wiss. Berlin, p. 82, Taf. xv. fig. 3. 



Shell ovate, smooth, nearly of the same form and structure as Podocyrtis papalis, but different 

 in the proportions of the joints, in the much smaller, regular pores, and in the great breadth of the 

 shovel-shaped, blunt, about semicircular feet. Length of the three joints = 2:9:4, breadth = 

 3:10:3. Cephalis subspherical, with a thick pyramidal horn of the same length. Slight collar, but 

 no lumbar stricture. 



Dimensions. Length of the three joints, a 0'02, b 0'09, c 0'04 ; breadth, a 0'03, b 01, c 0'03. 



Habitat. Fossil in Barbados. 



29. Podocyrtis mitra, Ehrenberg. 



Podocyrtis mitra, Ehrenberg, 1854, Mikrogeol., Taf. xxxvi. fig. 20; Abhandl. d. k. Akad. d. Wiss. 

 Berlin, 1875, p. 82, Taf. xv. fig. 4. 



Shell ovate, conical, smooth, with two slight strictures. Length of the three joints = 1:2:3, 

 breadth = 1:3:4. Cephalis with the horn (of equal length) conical. Pores regular, circular, in 

 about twenty longitudinal rows, slightly increasing in size in the middle part of the abdomen. Feet 

 shovel-shaped, blunt, slightly divergent, only as long as the cephalis. 



Dimensions. Length of the three joints, a 0'025, b 0'5, c 0-7 ; breadth, a 0'03, 6 0'075, c 01. 



Habitat. Cosmopolitan; Mediterranean (Gibraltar), Canaiy Islands, Central Pacific, Stations 

 265 to 274, in different depths ; also fossil in Barbados. 



(ZOOL. CHALL. EXP. PART XL. 1886.) R r 169 



