EEPORT ON THE EADIOLARIA. 783 



Genus 341. Amphilonche,^ Haeckel, 1862, Monogi\ d. Radiol., p. 389. 



Definition. — A m p h i 1 o n c h i d a with two equal principal spines (frontal and 

 caudal spines not different); the eighteen smaller spines nearly equal. 



The genus AvvphHonche represents the original and at the same time the most 

 common form of Amphilouchida ; the two opposite principal spines are of equal size and 

 form, much larger (and often also of another form) than the eighteen smaller spines ; 

 these latter exhibit no marked differences in size and form. 



Subgenus 1. Am2)hiloncharium, Haeckel. 



Definition. — Spines in the centre united by the triangular faces of their pyramidal 

 bases, propped one upon another. No basal leaf-cross. 



1. Amphilonclie belonoides, Haeckel. 



Amjihilonche belonoides, Haeckel, 1862, Monogr. d. Radiol., p. 392, Taf. xvi. fig. 6, Taf. xviii. 



fig. 21. 

 Aeanthometra belonoides, Haeckel, 1860, Monatsber. d. k. Akad. d. Wiss. Berlin, p. 808. 



Two principal spines eyhudrical, of equal breadth throughout their whole length, with simple 

 conical apex ; base a small pyramid, without leaf -cross. Eighteen smaller spines conical, much 

 shorter, with simple bristle-shaped apex. Central capsule spindle-sfiaped or cylindrical, yellow. 



Dimensions. — Lengtli of the two major spines 04 to 0'8, of the eighteen minor 0-05 to 0-2. 



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



2. Amjihilonche lanceolata, n. sp. (PI. 132, fig. 1). 



Two principal spines compressed, lanceolate, two-edged, gradually tapering from the broader 

 middle towards the two ends ; apex simple ; base a large pyramid, with broad leaf-cross. Eighteen 

 smaller spines about half as long, pyramidal, with simple conical or bristle-shaped apex. Central 

 capsule lentelUptical, pink, opaque. 



Dimensions. — Length of the two major spines 0'2, of the eighteen minor O'l. 



Habitat. — Tropical Atlantic, Station 343, surface. 



3. Amphilonche diodon, n. .sp. (PL 132, fig. 3). 



Two principal spines compressed, lanceolate, two-edged, tapering from the broader middle towards 

 the two ends ; apex simple ; base a small pyramid, without leaf-cross. Eighteeii smaller spines 



' Amphilonche ^V^i^h two opiiosed spears ; cifi(pi. "hoyxii. 



