1428 THE VOYAGE OF H.M.S. CHALLENGER. 



5. Theocapsa wottonis, n. sp. (PI. QQ, fig. 11). 



Shell subovate, rough, with two deep strictures. Length of the three joints = 3:7:5, breadth = 

 3:9:8. Cephalis subspherical, with regular, circular, hexagonaUy-framed pores, and with a stout 

 pyramidal horn of the same length. Thorax conical, with subregular, circular, double-edged pores. 

 Abdomen hemispherical, smaller and thinner walled, with irregular, somewhat oblong pores. Basal 

 pole rounded. 



Dimensions. — Length of the three joints, a 0-03, h 0-07, c 0-05 ; breadth, a 0-03, h 0-09, c 0-08. 



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



6. Theocapsa gessneri, n. sp. 



Shell broadly ovate, with two deep strictures. Length of the three joints = 3:9:5, breadth = 

 4:10:4. Cephalis hemispherical, with a slender, conical horn of the same length. Thorax sub- 

 spherical, with small, regular, circular pores. Abdomen inversely conical, with few large, somewhat 

 oblong pores. Basal pole acute. 



Dimensions. — Length of the three joints, a 0'03, h 0'09, c 0'05 ; breadtli, a 004, h 0"1, c 004. 



Habitat. — North Pacific, Station 244, depth 2900 fathoms. 



7. Theocapsa aldrovandi, n. sp. 



Shell slender, inversely ovate, with two slight strictures. Length of the three joints = 3 : 8 : 14, 

 breadth = 4 : 11 : 8. Cephalis subglobular, with a conical horn of the same length. Thorax also 

 subglobular, papillate, with regular, circular, hexagonally-framed pores. Abdomen inversely conical, 

 slender, with very small and numerous, subregTilar, circular pores. Basal pole ovate, pointed. 



Dimemions.— Length of the three joints, a 0-03, b 008, c 014; breadth, a 004, b Oil, c 0-08. 



Habitat. — Western Tropical Pacific, Station 225, depth 4475 fathoms, 



8. Theocapsa malpighii, n. sp. (PI. 66, fig. 15). 



Shell inversely ovate, witli two distinct strictures. Length of the three joints = 3 : 8 : 11, 

 breadth = 4:9:8. Cephalis hemispherical, with a conical horn of the same length. Thorax hemi- 

 spherical, thorny, with very small circular pores, surrounded by large, regular, hexagonal frames. 

 Abdomen inversely campanulate, with larger circular pores, and longitudinal ribs. Basal pole blunt, 

 conical. 



Dimensions. — Length of the three joints, a 0-03, h 0-08, c Oil ; breadth, a 0-04, b 0-09, c 0-08. 



Habitat. — Central Pacific, Station 266, depth 2750 fathoms. 



Subgenus 3. Theocapsomma, Haeckel. 



Definition. — Thorax much smaller than the abdomen, pores of the two nearly equal 

 in size and similar in form. 



