1284 THE VOYAGE OF H.M.S. CHALLENGEE. 



half a hyaline, circular ring, in the lower half divided into from eighteen to twenty-four triangixlar, 

 curved, little convergent feet. 



Dimensions. — Cephalis 0'02 long, 0'05 broad ; thorax 01 long, 0'09 broad. 



Habitat. — Cosmopolitan ; Atlantic, Indian, Pacific ; many stations, at various depths. 



17. Carpocanitim coronatum, Ehrenberg. 



Carpocanium coronatum, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 66, Taf. v. 



fig. 7. 



SheU ovate, smooth, with perfectly hidden, subspherical cephalis. Length of the two 

 joints = 2 : 9, breadth = 2 : 8. Pores small and very numerous, twice as broad as the bars, 

 regular, circular, in about twenty longitudinal rows. Mouth little constricted, two-thirds as broad 

 as the thorax. Peristome with twenty-five to thirty short, bristle-shaped feet, which are slightly 

 curved, convergent, and in the upper half connected by a soUd ring. 



Dimensions. — Cephalis 0'02 long, 0-02 broad; thorax 0'09 long, 0"08 broad. 



Habitat. — Fossil in Barbados. 



18. Carpocanium dactijlus, n. sp. 



SheU slenderly ovate, twice as long as broad, with flat, perfectly hidden cephalis. Length 

 of the two joints = 1 : 12, breadth = 4 : 8. Pores subregular, circular, as broad as the bars, 

 ia about twelve longitudinal rows, separated by prominent longitudinal ribs. Mouth con- 

 stricted, two-thirds as broad as the thorax. Peristome with twelve large, lanceolate, lamellar, 

 convergent feet. 



Dimensions. — Cephalis O'Ol long, 0-04 broad ; thorax 0'12 long, 0-08 broad. 



Habitat. — South Pacific, Station 295, depth 1500 fathoms. 



19. Carpocanium irregulare, n. sp. (PI. 52, fig. 14). 



Shell irregular, roundish, subovate, with flat and oblique, perfectly hidden cephahs. Length of 

 the two joints = 1 : 10, breadth = 3 : 9. Pores irregularly .scattered, roundish, about as broad as the 

 bars. Mouth wide open, not at all or little constricted. Peristome with twenty to thirty long, 

 lamellar, pointed feet, which are irregularly curved and convergent. 



Dimensions. — CephaUs O'Ol to 002 long, 0-03 to 0-04 broad ; thorax 0-09 to Oil long, O'OS to 

 0-09 broad. 



Habitat. — Central Pacific, Station 2G3 to 274, surface, and at various depths. 



20. Cariiocanium verecwidum, n. sp. (PI. 52, figs. 12, 13). 



Sliell ovate, smooth, with flat, perfectly hidden cephahs (fig. 12). Length of the two joints = 

 1 : 9, breadth = 4:9. Pores subregular, circular, twice as broad as the bars, in about eighteen, 



