1340 THE VOYAGE OF H.M.S. CHALLENGER. 



9. Podocyrtis prismatica, n. sp. (PL 72, fig. 1). 



Shell conical, rough, with two distinct strictures. Length of the three joints = 1:1:3, breadth 

 = 1:2:5. Cephalis subspherical, with a curved conical horn of twice the length. Thorax and 

 abdomen together nearly hemispherical. Pores small, regular, circulai", quincuncial, twice as large in 

 the abdomen as in the thorax. Feet very large, twice as long as the whole shell, divergent, bent 

 outwards, prismatic, with strong prominent edges. 



Dimensions. — Length of the three joints, a 0-02, b 0-02, c OOG ; breadth, a 0-02, h 0-0-4, c 01. 



Habitat. — Western Tropical Pacific, Station 225, depth 4175 fathoms. 



10. Podocyrtis hrevipes, Ehreuberg. 



Podocyrtis hrevipes, Elirenberg, 1875, AbhanJl. d. k. AkaJ. d. "Wiss. Berlin, p. 80, Taf. xvi. 

 fig. 6. 



SheU conical, smooth, with two slight strictures. Length of the three joints = 2 : 3 : G, breadth 

 = 2:5:9. Cephalis subspherical, with a conical horn of the same length. Pores regular, circular, 

 quincuncial, three times as broad in the abdomen as in the thorax. Feet short, triangular, divergent, 

 as long as the horn. (The specimen figured by Ehrenberg was incomplete, one foot and the horn 

 being broken off.) 



Dimensions. — Length of the three joints, a 0'02, b 0-03, c O'CG ; breadth, a 0'02, h 005, c 0'09. 



Habitat. — Fossil in Barbados. 



11. Podocyrtis divergens, n. sp. (PI. 72, fig. 6). 



Shell slender, subconical, thick-walled, with two distinct strictures. Length of the three joints 

 = 2:5:7, breadth = 4:8:10. Cephalis hemispherical, with a large, oblique, prismatic horn three 

 times the length, and a small divergent by-horn at its base. Thorax hemispherical, rough, with 

 regular, circular, quincuncial pores. Abdomen cylindrical, thorny, with larger circular pores of 

 subregular disposition, two to three times as broad as those of the thorax. Feet conical, horn-like, 

 bent, as long as the abdomen ; strongly divergent in the distal half. 



Dimensions. — Length of the three joints, a 0-02, b 0-05, c 0-07 ; breadth, a O'Ol, b O'OS, c 01. 



Habitat. — Western Tropical Pacific, Station 220, depth 1100 fathoms. 



12. Podocyrtis collar is, Ehreuberg. 



Fodocyriis collaris, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 82; Taf. xvi. fig. 1. 



Shell conical, with slight collar and deeper lumbar stricture. Length of the three joints = 

 1:4:4, breadth = 1:4:8. Cephalis hemispherical, with a small oblique liorn of the same length. 

 Pores regular, circular, quincuncial, four to six times as broad in the inflated abdomen as in the 

 conical thorax. Feet short and slightly divergent, little longer than the cephalis. 



Dimensions.— Length of the three joints, a 0-02, b 0-07, c O'OS ; breadth, o O'Oo, b O'OS, c 016. 



Habitat. — Fossil in Barbados. 



