642 _ DE. G. J. HINDE AND ME. HOWAED FOX ON [XoV. 1 895, 



•04 mm. in width. No structure is shown, and the form is placed 

 here from its resemblance to specimens from the Swiss Jura, figured 

 by Rust (' Palseontographica,' vol. xxxi. 1885, p. 306, pi. xxxvi. 

 figs. 15-18). From Carzantic Quarry, near Launceston. 



Genus Lithosteobus, Haeckel. 



The conical latticed test has three or more transverse constrictions 

 and a horn-shaped extension at the summit. 



Lithostrobus, sp. a. PI. XXVII. fig. 16. The test is divided into 

 four chambers, the summit has an obtuse curved horn, the last 

 chamber is much larger than the others, and the aperture is oblique. 

 Length -23 mm., greatest width *08 mm. Heddon Quarry, near 

 Barnstaple. 



Genus Lithocampe, Haeckel. 



The conical, oval, or fusiform latticed test has the aperture con- 

 tracted, and it is without a horn-shaped process at the summit. 



Lithocampe, sp. a. PI. XXVII. fig. 15. Test conical, the con- 

 strictions indicate eight chambers, gradually increasing in size ; the 

 summit chamber is rounded, and the basal one contracted. Length 

 •25 mm., greatest width of last chamber -09 mm. Not infrequent. 

 Pamshorn Down. 



Genus Stichocapsa, Haeckel. 



Test conical, without horn at the summit ; the aperture of the 

 last or basal chamber is closed by a latticed plate. 



Sticliocapsa, sp. a. PI. XXVII. fig. 14. Test evenly conical, with 

 nearly straight sides and curved base, the summit pointed ; the 

 number of chambers is not shown. Length -28 mm., greatest width 

 •09 mm. Common. From Pamshorn Down. 



The following is a list of the genera of radiolaria which have 

 been recognized in the Lower Culm Measures of the different areas 

 referred to in the paper : — 



Order Beloidea. Order Discoidea. 



Genus Sphwrozoum. Genus Theodiscus. 



Sethodiscus. 



Order Spii;eroidea. Lithocyclia. 



Genus Cenosphcera. Trigonocyclia. 



Carposphera. Porodiscus 



Thecosvhcera. Ainphibrachmm. 



Xiphosphmra. Bhopalastrum. 



Xiphostylus. n , _ 



DoryspLra. 0rcler Cyrtoidea. 



Acanthosphmra. Genus Sethocapsa. 



Staurolonche. Lithostrobus. 



Lithocampe. 



Order Prunoidea. Stichocapsa. 



Genus Cenellipsis. 



Ellipsoxiphus. 

 Druppula. 



