1436 



THE VOYAGE OF H.M.S. CHALLENGER. 



L Subfamily 

 Stichopilida. 

 Mouth, of the ter- 

 minal joint a simple 

 wide opening. 



IL Subfamily 



Stichoperida. 

 Mouth of the terminal 



joint closed by a 



lattice-plate. 



Synopsis of the Genera of Podocampida. 



■ Lateral wings are f Cephalis with horn, 

 solid spmes. ( ^ ^ 



Three lateral appen- 

 dices or wings (no < 

 terminal feet). 



Three terminal ap- 

 pendices or feet 

 at the peristome 

 (all with cephalic 

 horn). 



Lateral wings are 

 latticed. 



Three lateral ribs or 

 crests prolonged 

 into the three ter- 

 minal feet. 



No lateral ribs. 

 Three terminal 

 feet free. 



With horn, 

 Without horn, 

 Feet solid, 

 Feet latticed, 



Feet solid, 

 Feet latticed. 



Last joint rounded, f ^^^.^^ j^^^^^ ^^^^ ^.j^^ ^^^ ^^^^ ^j j^^^^ 

 without a verti- | \ r i 



cal basal spine -j ,^^^^^ j^^^^^j i^tjjged wings (or rows of 

 (cephahs with ^. . _ /> ^ _ 



horn). [ ° ' 



Last joint conical, 

 pointed, with a 



vertical 

 spine. 



Three lateral solid ribs (cephalis with 



basal I an apical horn), 



626. Stkhopilium. 



627. Artopilium. 



628. Pteropilium. 



629. SHehocampe. 



630. Stichopterium. 



631. Podocampe. 



632. Stichopodium. 



633. Stichopera. 



634. Cyrtopera. 



635. Artopera. 



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



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

 Stichocyrtida triradiata aperta). 



Genus 626. Stichopilium,^ Haeckel, 1881, Prodromus, p. 439. 



Definition. — S tichopilida (vel Stichocyrtida trii-adiata aperta) with three solid 

 lateral ribs or wings, without terminal feet. Cephalis with a horn. 



The genus Stichopilium is the most primitive among all Stichocyrtida, and repre- 

 sents perhaps the common ancestral form of this family. The shell is composed of 

 four or more joints (sometimes ten to twelve), has a wide open terminal mouth, and 

 three lateral solid wings or ribs (sometimes a little latticed on the base). Stichopilium 

 may be derived from Tlieopilium or Pterocorys by addition of new terminal joints. 



Subgenus 1. Triacartus, Haeckel, 1881, Prodromus, p. 437. 

 Definition. — Shell with three annular strictures, and four distinct joints. 



1 Stich(ypilium='S.a.t with a row of joints; arixo;, ■xi'Kiou. 



