REPORT ON THE RADIOLARIA. 787 



Dimensions. — Length of the two major spines O'l to 0"2, breadth O'Oli to O'Oo ; 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-sliaped, witli four very broad, pro- 

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

 ends ; apex truncate pyramidal ; base witlr 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. 



Dimc7isions. — Length of the two major spines O'lo to 0'18, breadth 0'02 to 0-025; length of 

 the eighteen minor spines 0'04 to O'OS. 



Habitat . — Central Pacific, Station 271, surface. 



15. Amphilonche tetvaptera, Haeckel. 



Amphilonche tetvaptera, Haeckel, 1862, Monogr. d. E;idiol., p. 391, Taf. xvi. fig. 5, Taf. xviii. 



fig. 20. 

 Acanthometra tetraptera, Haeckel, 18G0, Monataber. d. k. preuss. AkaJ. d. Wiss. Berlin, [i. 808. 



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

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

 half as large. Central capsule spherical, opaque. 



Dimensio7is. — Length of the two major spines 0'2, breadth on the base 0'025 ; length of the 

 eighteen minor spines O'l. 



Habitat. — Mediterranean (IMessina); Nortli Atlantic, Canary Islands, Stations 352 to .354, surface. 



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



Definition. — Spines in the basal part growii 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. (PI. 132, figs. 4, -ia). 



Two principal spines cylindrical, very long, of equal breadth throughout their wliole lengtli, with 

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

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

 forming a single piece of acanthin (derived from AmiMlonche belonoides by central concrescence ; 

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



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 015. 



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



