1454 THE VOYAGE OF H.M.S. CHALLENGER. 



Synopsis of the Genera of Phormocampida. 



\ Lateral ribs prolonged into the 

 Shell conical or pyra- j terminal feet > ' ' 636 ' Stichophormis. 



I. Subfamily 



Stichophormida. 

 Mouth of the terminal 

 joint open, simple. 



II. Subfamily 



Stichophaenida. 

 Mouth of the terminal 

 joint closed by a 

 lattice-plate. 



i jjjm- , 

 midal. Mouth wide NQ ^^ ^ s ^ f 



' 



_ 

 open, not constricted. [ ^^ _ _ _ ' ^ Phormocampe. 



, ,, . ,, f Lateral ribs prolonged into the 



bhell ovate or spindle- i * t 



t 



v spine- i * t CQO 4 . T. 



, , T., ,f terminal feet, .... 638. Artopliormis. 

 shaped. Mouth more I 



or less constricted. j ^ ^^ ^ Feet ^ ^ 



[ minal, ..... 639. Cyrtophormis. 



Six radial ribs or wings, .... . 640. Artoplieena, 



Nine radial ribs or wings, ..... ..641. Stichophsena. 



Subfamily 1. STICHOPHORMIDA, Haeckel, 1881, Prodromus, p. 439. 



Definition. P hormocampida with the terminal mouth of the shell open (vel 

 Stichocyrtida multiradiata aperta). 



Genus 636. Stichophormis, 1 Haeckel, 1881, Prodromus, p. 439. 



Definition. S tichophormida (vel Stichocyrtida multiradiata aperta) with 

 conical or pyramidal shell, bearing in its wall numerous lateral ribs, which are prolonged 

 into terminal feet. Mouth not constricted. 



The genus Stichophormis and the three following genera represent together the sub- 

 family of Stichophormida, or of those multiradiate Stichocyrtida in which the mouth 

 remains open ; they may be derived therefore either from the Theophormida by in- 

 creasing the number of the shell-joints, or from the Stichopilida by the interpolation 

 of new radial ribs between the three primary ribs. Stichophormis may have been 

 derived in the former way from Theophormis. 



Subgemis 1. Stichophormium, Haeckel. 



Definition. Shell with six prominent longitudinal ribs, which are prolonged into six 

 (sometimes five or seven) divergent free feet over the mouth. 



1 . Stichophormis pyramidalis, n. sp. 



Shell slenderly pyramidal, with three annular septa, and six prominent radial ribs, which arise 

 from the collar-septum, and are prolonged on the mouth into six free, divergent, pyramidal feet, 



1 Stiehophormis = Row-basket ; 



