842 THE VOYAGE OF H.M.S. CHALLENGER. 



Subgenus 2. Lychnaspidium, Haeckel. 



Definition. — Condyles of the neighbouring plates grown together and sutures 

 obliterated, therefore the whole shell forms a single piece of acanthin. 



11. Lychnaspis echinoides, Haeckel. 



Haliomma echinoides, J. Miiller, 1858, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 36, Taf. v. figs. 3, 4. 

 Hulwrnmatidium echinuides, J. Miiller, 1858, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 22. 

 Halioinmatidium echinoides, Haeckel, 1862, Monogr. d. Radiol, p. 422. 



Parmal meshes pentagonal or somewhat roimdish, four times as broad as the Lars, and of about the 

 same size as the polygonal meshes. By-spines (about two hundred) short, zigzag. Eadial spines 

 thin ; their outer conical part shorter than the inner cyUndrical part. Sutures perfectly obliterated, 

 but recognisable by the characteristic pair of divergent by-spines. (Some recent observations on 

 this species, made during 1880 in Portofino, have convinced me that the interpretation of it given 

 in my Monograph, 1862, loc. cit., was quite correct.) 



Dimensions. — Diameter of the shell 0-12 to 014, parmal pores 0'015, sutural pores G'Ol to 

 0-02, bars 0-004. 



Habitat. — Mediterranean, Nice, Saint Tropez (J. Miiller) ; Portofino near Genoa (Haeckel). 



12. Lychnaspis haliommidium, n. sp. 



Lychnaspidium haliommidium, Haeckel, 1882, Manuscript. 



Parmal meshes circular, twice as broad as the bars, smaller than the irregular sutural meshes. 

 By-spiues (about two hundred) barbed and zigzag, as long as the radius. Eadial mam-spines 

 four-sided ; their outer pyramidal part shorter than the inner prismatic part. Sutures perfectly 

 •obliterated. 



Dimensions. — Diameter of the shell 01, parmal pores O'Ol, sutural meshes O'OIS to 0'02. 



Habitat. — South Atlantic, Station 335, depth' 1425 fathoms. 



13. Lychnaspis rabheana, n. sp. 



Parmal meshes circular, very small, of the same breadth as the bars, and much smaller than the 

 irregular sutural meshes. By-spines (about one hundred) very long and thin, . zigzag, about as 

 long as the diameter of the shell. Eadial main-spines cylindrical, thick, twice to three times as 

 long as the diameter of the shell. Sutures perfectly obliterated, with thickened condyles. Named 

 in honour of Captaui Henrik Eabbe (of Bremen), to whom I am indebted for many new Indian and 

 Atlantic Radiolaria. 



Dimensions. — Diameter of the shell 0-086, parmal pores 0-002, sutural pores 0-012, bars 0-002. 



Habitat. — Indian Ocean (Madagascar), Eabbe, surface. 



