1198 THE VOYAGE OF H.M.S. CHALLENGER. 



with much larger irregular roundish pores and three prominent ribs, which are prolonged into three 

 stout, club-shaped, strongly divergent feet of the same length. Mouth widely open, elegantly 

 coronate, with a circle of numerous small cilia. 



Dimensions. — Cephalis 0'02 long, 0-03 broad ; thorax 0-06 long, 0-08 broad. 



Hahitat. — Central Pacific, Station 272, depth 2600 fathoms. 



11. Dictyophimus arabicus, Haeckel. 



Lychnocanium arabicum, Ehronberg, 1872, Abliandl. d. k. Ak'ad. d. Wiss. Berlin, p. 296, 

 Taf. X. fig. 3. 



Shell smooth, three-sided pyramidal, with deep collar stricture. Eelative length of the two joints 

 = 1:3, breadth = 1:4. Cephalis subspherical, with a slender horn of the same length. Thorax 

 with much larger, irregular roundish pores, and three widely divergent ribs, which are prolonged 

 into three slender, somewhat recurved feet of about the same length. 



Dimensions. — Cephalis 0'02 long, 0"02 broad ; thorax 0'07 long, 0'09 broad. 



Hahitat. — Indian Ocean, Zanzibar (Pullen), depth 2200 fathoms. 



12. Dictyophimus platycephalus, n. sp. (PI. 60, figs. 4, 5). 



Shell smooth, flat, three-sided pyramidal, with distinct collar stricture. Eelative length of the two 

 joints =1:3, breadth = 3:9. Cephalis iiat, cap-shaped, three times as broad as long, with a slender 

 conical horn of the same length. Thorax flatly vaulted, with much larger, irregular roundish, double- 

 edged pores, and three widely divergent ribs, which are prolonged into three slender conical feet of 

 the same length. Central capsule in the cephalis flat, discoidal, with a discoidal nucleus of half 

 the size, and with four large pear-shaped crecal sacs depending into the thorax, each of which 

 contains a large oil globule (fig. 4). 



Dimensions. — Cephalis 0'02 long, 0'07 broad ; thorax 0'06 long, 018 broad. 



Habitat. — North Atlantic, Canary Islands (Lanzerote), Haeckel, surface. 



13. Dictyophimus hrandtii, ii. sjj. (PI. 60, fig. 6). 



Shell smooth, flat, three-sided pyramidal, with deep collar stricture, very similar to the preced- 

 ing species. Eelative length of the two joints =1:3, breadth = 2:7. Cephalis hemispherical, with a 

 slender conical horn of twice the length. Thorax flatly vaulted, with irregular polygonal pores and 

 thin bars ; and with three widely divergent ribs, which are prolonged into three slender prismatic 

 feet of thrice the length. In fig. 6 the shell is seen from the base and exhibits very distinctly 

 the collar septum with its four large meshes, two minor jugular and two major cardinal pores. 



Dimensions. — Cephalis 0-03 long, 0-07 broad ; thorax O'OB long, 0'2 broad. 



Habitat. — North Pacific, Station 236, surface. 



