REPORT ON THE RADIOLARIA. 787 



Dimensions. Length of the two major spines 01 to 0'2, breadth 0'02 to 0'03 ; length of the 

 eighteen minor spines 0'05 to O'l. 



Habitat. Central Pacific, Stations 270 to 274, surface. 



14. Amphilonche violina, n. sp. (PI. 132, fig. 5). 



Two principal spines quadrangular prismatic, nearly violin-shaped, with four very broad, pro- 

 minent, lamellar wings, which are constricted in the middle part, and broadened towards the two 

 ends ; apex truncate pyramidal ; base with a large leaf-cross. Eighteen .smaller spines much shorter, 

 of equal breadth at the base, assuming the form of a quadrangular pyramid, thin prismatic in 

 the distal half. Central capsule spindle-shaped, opaque. 



Dimensions. Length of the two major spines 0'15 to 0'18, breadth 0'02 to 0'025 ; length of 

 the eighteen minor spines 0'04 to 0'08. 



Habitat. Central Pacific, Station 271, surface. 



15. Amphilonche tetraptera, Haeckel. 



Ampliilonche tetraptera, Haeckel, 1862, Monogr. d. Radio!., p. 391, Taf. xvi. fig. 5, Taf. xviii. 



fig. 20. 

 Aeanthometra tetraptera, Haeckel, I860, Monatsber. d. k. preuss. AkaJ. d. Wiss. Berlin, p. 808. 



Two principal spines four-sided pyramidal, with four broad lamellar prominent edges ; apex 

 simple or bifid ; base with a large leaf-cross. Eighteen smaller spines of similar form, but only 

 half as large. Central capsule spherical, opaque. 



Dimensions. Length of the two major spines 0'2, breadth on the base 0'025 ; length of the 

 eighteen minor spines O'l. 



Habitat. Mediterranean (Messina); North Atlantic, Canary Islands, Stations 352 to 354, surface. 



Subgenus 3. Amphilithium, Haeckel, 1881, Prodromus, p. 466. 



Definition. Spines in the basal part grown together, so that the whole skeleton 

 represents a single piece of acanthin ; a star with two larger and eighteen smaller rays. 



16. Amphilonche concreta, n. sp. (PL 132, figs. 4, 4a). 



Two principal spines cylindrical, very long, of equal breadth throughout their whole length, with 

 simple conical apex. Eighteen smaller spines short, conical or bristle-shaped, scarcely one-fourth or 

 one-tenth as long, often quite rudimentary. All twenty spines perfectly grown together in the centre, 

 forming a single piece of acanthin (derived from Amphilonche bclonoides by central concrescence ; 

 often the sutures, of the concreted bases are visible, fig. 4). 



Dimensions. Length of the two major spines O'l to 0'4, breadth O'OOo to O'Olo ; length of the 

 eighteen minor spines 0'005 to 0'15. 



Habitat. Cosmopolitan ; Mediterranean, Atlantic, Pacific, surface. 



