RADIOL ARIA. 107 



Dimensions : -Cepluilis, 0-027 



mm. 



long a 



Thorax, 0*039 



u 



long. 



0-031 



ll 



broad 



All three joints, 0-190 



li 



long. 



AVjdomen, 0-147 



n 



Inroad 



Occurrence : not frequent. 







Family : Theocyrtida. 

 8ub-family : Theocapsida. 



Genus : Tricolocapsa, Haeckel. 



8. Tricolocapsa salva, Riist. 



Plate XV., fig. 3. 



Theocajisa saha, Riist, 1885. Pala^ontographica, Bd. xxxiv, p. 210, 

 Taf. 28, fig. 5. Beitrage zur Kenntniss der fossilen Radiolarien in 

 der Gesteinen der Kreide, von Di-. Riist. 



8hell slenderly ovate, with two slight strictures. Thorax of about the 

 same size as the abdomen. Relative lengths of the three joints l:3-5:-l, 

 relative breadth 1:3: 3-5. Cephalis flat hemispherical, hyaline, with- 

 out pores. Thorax spherical with subregular circulai- unequal pores. 

 Abdomen broad ovate, with larger, regular, circular pores, in from nine 

 to ten transverse rows. Surface smooth. 



Dimensions : — Length of shell, 0-23 nnn. 



Breadth of abdomen, 0*127 " 



Occurrence : frequent. 



This species \<^as first discovei-ed in the Coprolites of the Gault neai- 

 Zilli in Saxony, and described in Paheontographica, \(A. xxxiv. The 

 form there found is a little smaller, but is of very common occurrence. 



9. Tricolocapsa thoracica, n. sp. 

 Plate XV., fig. 4. 

 Shell ovate, smooth, with two distinct strictures. Relative lengths t)f 

 the three joints 2:5: 3. Relative Vjreadths 2 : 5 : 5. Cephalis hemi- 

 spherical, with from three to four transverse rows of small circular pores. 

 Thorax subspherical, with from nine to ten transverse rows of larger 

 regular circular pores. Abdomen broad, hemispherical, with from four 

 to five transverse rows of pores of the same size. 

 Dimensions :■ — -Length of shell, 0-204 mm. 

 Breadth n 0*157 m 



Occurrence : not frequent. 



