1444 THE VOYAGE OF H.M.S. CHALLENGER. 



The genus Stichocampe, together with the three following genera, represent a 

 peculiar small group among the Stichocyrtida, differing from all other members of this 

 family in the possession of three free terminal feet around the open mouth. In the 

 two genera, Stichocampe and Stichopterium, these three feet are the terminal prolonga- 

 tions of three lateral ribs or crests, while in the two genera developed later, Podocampe 

 and Stichopodium, the three original ribs are lost, and only the three free feet 

 remain. Stichocampe (the most primitive of these four genera) may be derived from 

 Theopodium by addition of new joints. 



1. Stichocampe divergens, n. sp. 



Shell spiny, broadly pyramidal, with six deep strictures. Seven joints gradually increasing in 

 breadth and length, the seventh twice as broad as the fourth. Pores subregular, circular, hexagon- 

 ally framed. The prominent edges of the pyramis are prolonged over the wide mouth into three 

 slender, straight, divergent feet, half as long as the shell 



Dimensions. Length of the shell (with seven joints) 0'3, of the last joint O06, of the fourth 

 0-03 ; breadth 0'25. 



Habitat. Central Pacific, Station 265, depth 2900 fathoms. 



2. Stichocampe convergens, n. sp. 



Shell smooth, slenderly pyramidal, with eight distinct strictures. All nine joints nearly equal in 

 length. Pores regular, circular, forming three or four transverse rows in each joint. The smooth 

 edges of the pyramis are prolonged over the wide mouth into three slender, slightly curved, and 

 convergent feet, twice as long as one joint. 



Dimensions. Length of the shell (with nine joints) 0'25, of each joint, about 0'35 ; breadth Oil. 



Habitat. Central Pacific, Station 273, depth 2350 fathoms. 



Genus 630. Stichopterium, 1 Haeckel, 1881, Prodromus, p. 439. 



Definition. S tichopilida (vel Stichocyrtida triradiata aperta), with three 

 lateral ribs or wings, which are prolonged into three latticed, terminal feet. Cephalis 

 with a horn. 



The genus Stichopterium has in general the same shell-formation as the nearly 

 allied Stichocampe, but differs from this ancestral form in the fenestration of the three 

 terminal feet. It corresponds, therefore, to Pterocanium among the Tricyrtida. 



1 Stichopterium = Row-wing ; arixs , W j<o. 



