EEPOBT ON THE RADIOLARIA. 1309 



14. Dictyocephalus cavea, n. sp. 



Shell rough, thin-walled, with slight collar stricture. Length of the two joints = 3:10 = 

 breadth = 5:7. Cephalis hemispherical, thorny, with numerous regular, circular pores. Thorax 

 subcylindrical, with very large, circular, hexagonally-framed pores (hi nine longitudinal alternating 

 rows), three to five times as broad as the cephalic pores. Mouth truncate, wide open, without 

 ring-like peristome. 



Dimensions. Cephalis 0'06 long, O'l broad ; thorax O2 long, 0'14 broad. 



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



15. Dictyocephalus capita, Ehrenberg. 



Dictyocephahis capita, Ehrenberg, 1872, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 289, 



Taf. vii. fig. 24. 



Shell smooth, thin-walled, with sharp collar stricture. Length of the two joints = 7:9, 

 breadth = 6:8. Cephalis ovate, with numerous irregular, roundish, densely - crowded pores. 

 Thorax ovate, with very few widely-scattered, irregular, roundish pores (broken off in Ehrenberg's 

 figure). Mouth truncate, little constricted, without ring-like peristome. 



Dimensions. Cephalis 0'07 long, 0'06 broad ; thorax 0'09 long, - 08 broad. 



Habitat. Western Tropical Pacific (Philippine Sea) Station 206, depth 2100 fathoms. 



16. Dictyocephalus hispidus, Ehrenberg. 



Dictyocephalus hispidus, Ehrenberg, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin ; Abhandl. 



d. k. Akad. d. Wiss. Berlin, 1872, p. 289, Taf. v. fig. 18. 



Shell rough, thin-walled, with deep collar stricture. Length of the two joints = 3:4, 

 breadth = 3:5. Cephalis subspherical, spiny, with the same irregular, roundish pores as the 

 funnel-shaped or nearly ovate thorax. Mouth truncate, little narrower than the thorax, without 

 ring-like peristome. 



Dimensions. Cephalis 0'03 long, 0'03 broad ; thorax 0'04 long, 0'05 broad. 



Habitat. Tropical Atlantic, Mexican Gulf (Ehrenberg) ; Station 338, depth 1990 fathoms. 



Subfamily 2. SETHOCAPSIDA, Haeckel, 1881, Prodromus, p. 433. 



Definition. Sethocyrtida with the basal mouth of the shell fenestrated (vel 

 Dicyrtida eradiata clausa). 



