1674 THE VOYAGE OF H.M.S. CHALLENGER. 



14. Gazelletta dendronema, n. sp. (PI. 120, fig. 16). 



Shell hemispherical, thorny, with a broad, alveolate velum which bears irregular hollow thorns 

 on the inside and on the free margin (fig. 16). Feet divergent, irregularly curved, with scattered 

 arborescent lateral spines, which are irregularly branched, and bear at the distal end of each branch 

 a small spathilla with four to six teeth. The distal ends of the feet are dichotomously branched, 

 with stouter simple fork-branches. 



Dimensions. Length of the shell 017, breadth 0'36 ; length of the feet O5 to 0'7. 



Habitat. North Pacific, Station 252, surface. 



15. Gazelletta melusina, n. sp. (PI. 118, fig. 1). 



Shell campanulate, spiny. Feet divergent, strongly curved, with scattered arborescent lateral 

 spines, which are richly and dichotomously branched, with thin, simple, terminal branches. The distal 

 ends of the feet bear three or four much larger and stouter branches, which are again dichotomously 

 branched. 



Dimensions. Length of the shell 0'2, breadth 015 ; length of the feet 0'5 to 0'8. 



Habitat. South Pacific, Station 293, depth 2025 fathoms. 



Genus 703. Gorgonetta, 1 n. gen. 



Definition. M edusettida with twelve articulate feet on the peristonie, six 

 ascending and six alternate descending. 



The genus Gorgonetta is the most highly developed of all hitherto observed 

 Medusettida, and belongs to the most remarkable forms of Eadiolaria. Its general 

 shape is very similar to that of a larva of a Geryonia or Carmarina, in which six 

 interradial larval tentacles are directed upwards, six alternating perradial permanent 

 tentacles downwards. The six ascending feet are in all the four species observed 

 smaller, more or less branched, and armed with spathillas. The six descending feet are 

 much larger and covered with very elegant pencils, the single threads of which bear 

 a double spathilla. The distal ends of the feet are forked or branched. 



1. Gorgonetta mirabilis, n. sp. (PL 119, figs. 1-4). 



Shell cap-shaped, flatly vaulted, or nearly hemispherical, about twice as broad as long, with 

 smooth surface. Six ascending feet widely divergent, about twice as long as the breadth of the 

 shell, nearly straight, arborescent, with numerous curved branches, each of which bears at the distal 

 end a spathilla with four to six short recurved teeth (fig. 2). Six descending feet about twice, as 



1 Gorgonetta = Diminutive of Goryo, Medusa. 



