1436 



L Subfamily 



Stichopilida. 

 Mouth of the ter- 

 minal joint a simple 

 wide opening. 



THE VOYAGE OF H.M.S. CHALLENGER. 

 Synopsis of the Genera of Podocampida. 



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. 



With horn, 

 "Without horn, 



Three lateral ribs or f ... 

 crests prolonged I Feet solld ' 



Feet latticed, 



into the three ter- 

 minal feet. 



No lateral ribs. 

 Three terminal 

 feet free. 



Feet solid, 

 Feet latticed, 



II. Subfamily 



Stiehoperida 

 Mouth of the terminal 



joint closed by a 



lattice-plate. 



Last joint rounded, f Th , ateral goM ribs (or rows o{ ines) 

 without a verti- 

 ine j 

 ith | 



cal basal 

 (cephalis 



spine 

 with 



Three 1&teral latticed wi (or rows of 

 wings)> 



Last joint conical, (" 



pointed, with a] Three lateral solid ribs (cephalis with 



vertical basal j an apical horn), 



spine. 



626. Stichopilium. 



627. Artopilium. 



628. Pteropilium. 



629. Stichocampe, 



630. Stichopterium. 



631. Podocampe. 



632. Stichopodium. 



633. Stichopera. 



634. Cyrt opera. 



635. Artopera. 



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



Definition. Podocampida with the terminal mouth of the shell open (vel 

 Stichocyrtida triradiata aperta). 



Genus 626. Stichopilium, 1 Haeckel, 1881, Prodromus, p. 439. 



Definition. S tichopilida (vel Stichocyrtida triradiata 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 Theopilium 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 Stichopilium =Hat with a row of joints; <rr/xo?j -iX/o. 



