1468 



THE VOYAGE OF H.M.S. CHALLENGER. 



I. Subfamily 

 Stichocorida. 



Terminal mouth 

 of the last shell- 

 joint a simple 

 ■wide opening. 



Synopsis of the Genera of Lithocampida. 



' ri ■ A J ( With horn, 

 Conical, gradu- j ' 



aUy dilated. ( j^^ j,,^^ 



All annular 

 septa or 



transverse 

 strictures of 



the shell 



separated, 

 parallel, not 



connected 



by a spiral 



line. 



Shell conical 

 or cylindrical. 

 Mouth of the 

 last joint wide 

 open, not dis- 

 tinctly con- 

 stricted. 



Conical above, ( 



J Wi 



below. ( 



cylindrical 



ith horn. 



Cylindrical or ( With horn, 

 subcylin- < 

 drioal. ( No horn, 



Shell ovate or 

 spindle-shaped. 

 Mouth of the 

 last joint con- 

 stricted. 



Cephalis with 

 a horn. 



Cephalis with- 

 out horn. 



Last joint 

 tubular. 



Last joint a long 

 tube. 



not 



Cephalis 

 tube. 



with 



Cephalis without 

 tube, 



II. Subfamily 

 Stichocapsida. 



Terminal mouth 

 closed by a 

 lattice-plate. 



Annular septa or transverse strictures of the ( With horn, . 

 shell all or partly obliquely descending and -J 

 connected spirally. ( No horn, 



Last joint rounded, without a vertical basal J ' 



" ■ I No horn, 



642. Lithostrobus. 



643. Dictyomitra. 



644. Stichocorys. 



64-5. Artostrohus. 



646. Litlioniitra. 



647. Eucyrtidium. 



648. Eusyringium. 



649. Siphocampe. 



650. Lithocampe. 



651. Spirocyrtis. 



652. Spirocampe. 



653. Cyrtocapsa. 



654. Stiehoeapsa. 



Last 

 spine. 



^jomt conical, pointed, with a vertical, basal | Cephalis with horn, 655. Artocapsa. 



Subfamily 1. Stichocorida, Haeckel, 1881, Prodromus, p. 438. 



Definition. — L ithocampida with the terminal mouth of the shell open (vel 

 Stichocyrtida eradiata aperta). 



Genus 642. Lithostrobus,^ Biitschli, 1882, Zeitschr. f. wiss. Zool., vol. xxxvi. p. 529. 



Definition. — S tichocorida (vel Stichocyrtida eradiata aperta), with conical 

 shell, gradually dilated towards the wide open mouth. Cephalis with a horn. 



The genus Lithostrohus is probably the most primitive among the Lithocampida, 

 and comprises those forms of this family in which the slender, conical shell is gradually 

 dilated towards the wide, terminal mouth, each joint being broader than the preceding. 



' Lithostrohus = Con& of siles; 7i;'^o;, o-tjo'/Jos. 



