KEPORT ON THE RA.DIOLARIA. 1479 



Bimemions. — Length of the shell (with eight joints) 0'2, of the fourth joint 002, of the eighth 

 joint 0-04; breadth of the fourth joint 0-04, of the eighth 0-08. 



Habitat. — Fossil in secondary rocks of North Germany (chalk of Brunswick, &c.), Zittel. 



Genus 644. Stichocorys,^ Haeckel, 1881, Prodromus, p. 438 {sensii emendato). 



Dejinition. — Stick o c o r ida (vel Stichocyrtida eradiata aperta) witli a middle 

 constrictioa of the shell, the upper half of which is conical, the lower cylindrical. Moutli 

 truncate. Cephalis with a horn. 



The genus Stichocorys is intermediate between the two preceding and the two 

 following genera; the upper half of the shell with the three first joints is conical, the lower 

 half with the fourth and the following joints cylindrical, of equal breadth. The third joint 

 of the shell (or the abdomen of Theoconus) is constantly the largest, being broader than 

 all the other joints. Stichocorys is a very common and characteristic form, and may 

 be derived from Theoconus by development of a post-abdomen. 



1. Stichocorys wolffii, n. sp. (PI. 80, fig. 10). 



Shell in the upper half (with three joints) thorny, in the lower half (with two joints) smooth. 

 Pores of the former double-contoured, in subregular, transverse rows. Pores of the latter smaller, 

 simple, scarcely scattered. Cephalis with a pyramidal horn of the same length. Thorax with pro- 

 minent, longitudinal divergent ribs. Dedicated to Caspar Friedrich Wolff (Halle, 1759). 



Dimensions. — Length of the shell (with five joints) 016; breadth of the third joint 0-08, of the 

 fourth 0-05. 



Habitat. — Western Tropical Pacific, Station 225, depth 4475 fathoms. 



2. Stichocorys pander i, n. sp. (PI. 80, fig. 7). 



Shell m the upper conical half (with three joints) spiny, in the lower subeylmdrical half (with 

 three joints) smooth. Pores small, circular, irregularly scattered, simple. Cephalis with a conical 

 horn of the same length. No longitudinal ribs. Dedicated to Christian Pander (Wlirzburg, 1817.) 



Dimensions. — Length of the shell (with six joints) 018; breadth of the third joint 0-08, of the 

 fourth 0-05. 



Halitat. — Central Pacific, Station 265, depth 2900 fathoms. 



3. Stichocorys haerii, n. sp. (PI. 80, fig. 8). 



Shell ua the upper conical half (with three jomts) spmy, in the lower cylindrical half (with three 

 joints) sulcate, with promment longitudinal ribs, alternating with longitudinal rows of small pores. 



' Stichocorys = Row-helmet ; oTiyji;, ic'oks . 



