1346 THE VOYAGE OF H.M.S. CHALLENGER. 



i 



30. Podocyrtis argus, Ehrenberg. 



Podocyrtis argus, Ehrenberg, 1875, AbhandL d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xvi. fig. 9. 



Shell ovate, with two distinct strictures, smooth. Length of the three joints =1:3:4, 

 breadth = 1:4:5. Cephalis subconical, with a conical horn of the same length. Thorax cam- 

 panulate. Abdomen inflated. Pores subregular, roundish, of nearly equal breadth, quincuncial. 

 Feet shovel-shaped, triangular, nearly vertical, only as long as the cephalis. 



Dimensions. Length of the three joints, a 0'02, I 0'06, c 0'08 ; breadth, a 0'025, I 008, c 01. 



Habitat. Tropical Atlantic, Station 347, surface ; fossil in Barbados. 



31. Podocyrtis eulophos, Ehrenberg. 



Podocyrtis eulopJios, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xiv. fig. 6. 



Shell subconical, slender, with two slight strictures, smooth. Length of the three joints = 

 1:2:6, breadth = 2:4:6. Cephalis hemispherical, with a large, spindle-shaped, angular horn of 

 twice the length. Thorax hemispherical. Abdomen truncate, conical. Pores subregular, roundish, 

 in about twenty longitudinal rows, their breadth gradually increasing towards the base. Feet 

 shovel-shaped, blunt, nearly vertical, only as long as the cephalis. 



Dimensions. Length of the three joints, a 0'025, b 0'05, c 016 ; breadth, a 0'05, b O'OS, c 014. 



Habitat. Fossil in Barbados. 



32. Podocyrtis favosa, n. sp. 



Shell ovate, with two slight strictures, and with honeycomb-like surface. Length of the three 

 joints =1:5:2, breadth = 2:6:5. Cephalis hemispherical, with a pyramidal horn of twice the 

 length. Thorax hemispherical. Pores regular, circular, hexagonally framed, funnel-shaped, with 

 high, prominent crests between them. Feet shovel-shaped, little convergent, triangular, as long as 

 the abdomen. 



Dimensions. Length of the three joints, a - 02, b 01, c 0'04 ; breadth, a 0'04, b 012, c Oil. 



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



33. Podocyrtis fusiformis, n. sp. 



Shell slender, nearly spindle-shaped, diminishing gradually from the broadest middle part 

 (immediately above the lumbar septum) towards the two poles. Length of the three joints = 

 1:5:8, breadth = 2:6:5. Cephalis subspherical, with a large conical horn three times the length. 

 Thorax and abdomen with twenty-four to thirty denticulated, longitudinal ribs, separating the same 

 number of longitudinal rows of regular, circular pores. Instead of the lumbar stricture, a broad, 

 internal septum occurs. Feet slender, straight, as long as the abdomen, only slightly convergent. 



Dimensions. Length of the three joints, a 0'03, b 01, c 016 ; breadth, a 0'05, b 012, c 01. 



Habitat. Indian Ocean, Madagascar (Eabbe) surface. 



