1342 THE VOYAGE OF H.M.S. CHALLENGEE. 



conical thorax. Spines of the former twice as large as those of the latter. Feet very long and 

 slender, cylindrical, S-shaped, bent outwards at the thickened distal end, with a spindle-shaped 

 papillate knob. 



Dimensions. Length of the three joints, a 0'03, b 0'04, c 01 ; breadth, a 0'04, b 0'08, c 014. 



Habitat. Canary Islands, Lanzerote, Haeckel, surface. 



17. Podocyrtis princeps, Ehrenberg. 



Podocyrtis princeps, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xiii. 



fig. 1. 



Podocyrtis princeps, Biitschli, 1882, Zeitschr. f. wiss. Zool., vol. xxxvi. p. 540, Taf. xxxiii. 

 fig. 32. 



Shell conical, with two distinct strictures. Length of three joints =1:2:5, breadth = 1:4:7. 

 Cephalis subspherical, with a large cylindrical, vertical horn, longer than the whole shell. Pores 

 regular, circular, quincuncial, in the inflated spiny abdomen very large (four to five in the course of 

 its length), five times as broad as in the smooth conical thorax. Feet about as long as the shell, 

 slightly bent, S-shaped, cylindrical. 



Dimensions. Length of the three joints, a 0'02, b 0'05, c 01 ; breadth, a 0'03, b 0'08, c 014. 



Habitat. Tropical Atlantic, Station 348, depth 2450 fathoms ; fossil in Barbados. 



18. Podocyrtis euceros, Ehrenberg. 



Podocyrtis euceros, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82, Taf. xv. fig. 1. 



Shell conical, campanulate, with two deep strictures. Length of the three joints = 1:3:6, 

 breadth = 2:5:7. Cephalis hemispherical, with a large, cylindrical horn, nearly as long as the 

 shell. Pores regular, circular, hexagonally framed, quincuncial, four times as broad in the papillated, 

 inflated abdomen as in the hemispherical, smooth thorax. Feet short and broad, triangular, divergent, 

 about as long as the thorax. (In the specimen figured by Ehrenberg, two feet were broken off). 



Dimensions. Length of the three joints, a 0'016, b 0'05, c 01 ; breadth, a 0'03, b 0'08, c 012. 



Habitat. Cosmopolitan ; Mediterranean, Atlantic, Indian, and Pacific Oceans, at many stations, 

 and in various depths ; fossil in Barbados. 



19. Podocyrtis cristata, n. sp. (PI. 72, fig. 7). 



Shell conical-campanulate, thorny, with two deep strictures. Length of the three joints = 

 1:2:5, breadth = 2:4:7. Cephalis subspherical, with a large, oblique, little bent, conical horn, as 

 long as the abdomen. Thorax hemispherical, papillate, with small, regular, circular pores. 

 Abdomen inflated, with very large, circular pores, (three to four in its length), six times as broad as 

 those of the thorax, and separated by hexagonal, serrated crests. Feet cylindrical, stout, S-shaped, 

 slightly divergent, with a spherical papillate knob at the distal end. 



Dimensions. Length of the three joints, a 0'02, b 0'04, c 01 ; breadth, a 0'035, b 0'07, c 014. 



Habitat. South Atlantic, Station 332, depth 2200 fathoms. 



