REPORT ON THE RADIOLARIA. 1551 



Subfamily 1. Cannobelida, Haeckel. 



Definition. — C a n u o r r h a p li i d a with uumerous hollow cylindrical or spindle- 

 shaped tubes, which lie tangentially scattered on the surface of the spherical calymma. 



Genus 658. Cannohelos,'^ n. gen. 



Definition. — C a n n o r r h a ji h i d a with a skeleton composed of tubular acicular 

 pieces, which are smooth, cylindrical or spindle-shaped tangential needles, without spines 

 and branches. 



The genus Cannohelos, and the following closely allied Cannorrhaphis, represent 

 the peculiar subfamily Camiobelida, differing from the other Cannorrhaphida in the 

 acicular form of the pieces of the skeleton, which are tangentially scattered on the 

 surface of the spherical calymma. The cylindrical or spindle-shaped hollow needles 

 are smooth in Cannohelos, whilst in Cannorrhaphis they are studded with lateral 

 spines or branches. 



1. Cannohelos cavispicula, Haeckel. 



Thalasaoplancta cavispicula, Haeckel, 1862, Monogr. d. Eadiol., p. 261, Taf. iii. figs. 10-13. 

 TJialassicotta caviqnciila, Haeckel, 1860, Monatsber. d, k. preuss. Akad. d. Wiss. Berlin, p. 798. 

 CamiorrhapMs cavispicula, Haeckel, 1881, Prodromus, p. 470. 



Tangential tubes cyliudrieal, more or less curved, gradually tapering towards the two pointed ends. 

 Calymma with a voluminous phasodium. 



Dimensions. — Length of the tubular spicule 0"25, breadth 0003. 

 Hahitat. — Mediterranean, Messina, surface. 



2. Cannohelos cahjinnutta, n. sp. 



Tangential tubes cylindrical, straight, of equal breadth throughout their whole length, closed by 

 a hemispherical cap on the two rounded ends. Calymma very voluminous, with a small phteodium. 

 Dimensions. — Length of the tubular spieula 0'3 to 0"5, breadth 0'004 to O'OOS. 

 Habitat. — Central Pacific, Stations 263 to 274, surface. 



3. Cannohelos thalassojilancta, n. sp. 



Tangential tubes spindle-shaped, straight, gradually tapering towards the two pointed ends. 

 Calymma and the included phaeodium rather voluminous. 



Dimensions. — Length of the tubular spieula Olo to 0'2, breadth in the middle part 0"02. 

 Habitat. — Ti'opical Atlantic, Station 347, surface. 



' Cannohelos = Bearing hoUow tubular arrows; kxi/:/ci, ;SeAoj. 



