Vol. 56.] UPPEE CHALK AT COTJLSDON. 701 



Sub-order Die yet id a, Haeckel. 



Genus Dicolocapsa, HaBckel. 



The test consists of two segments ; the basal segment is oval or 

 globular, and the aperture covered by a latticed plate. The first 

 segment is without a pointed horn on the summit. 



Dicolocapsa sp. (PL XXXVII, fig. 28.) 



Basal segment globular, with polygonal pores. Diameter ='11 

 mm. Height of first segment = *03 mm. 



Sub-order Stichocyetida, Haeckel. 



The latticed test consists of four or more members, with three or 

 more transverse constrictions. 



Genus Litkocampb, Hseckel. 



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

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



Lithocaiipe sp. (PI. XXXVII, fig. 21.) 



Height of test with four segments ='10 mm. Breadth of basal 

 segment ="08 mm. First segment smooth. No pores shown. 



Genus Dictyomitra, Zittel. 



The latticed test is conical or cylindrical, without horn, and with 

 an open basal aperture. The constrictions are horizontal. 



DlCTYOMITRA MULTICOSTATA, Zittel. (PI. XXXVIII, fig. 3.) 



Test slender, conical, with prominent longitudinal ribs, and from 

 eight to ten deep constrictions. Length and breadth of the joints 

 gradually increasing, the eighth joint being twice as long and broad 

 as the fourth joint. Pores regular, circular, one series in each 

 longitudinal furrow ; three to four pores in each joint. 



In this specimen, which shows seven joints only, there appears 

 to be a double row of pores between each vertical line. Height 

 = •255 mm. Greatest breadth = *10 mm. Breadth at base 

 = •09 mm. 



Cretaceous rocks of Brunswick (Zittel). Cretaceous rocks of Pierre 

 Formation of North-western Manitoba (Kiist). Figured by Zittel 

 in the Zeitschrift d. Deutsch. Geol. Gesellsch. vol. xxviii (1876) 

 pi. ii, figs. 2-4. 



DlCTYOMITRA TIARA, Sp. n0V. (PI. XXXVIII, fig. 4.) 



The test is large, with nine deep constrictions. The first segment 

 is dome-shaped. The remaining segments have prominent longi- 

 tudinal ribs. They are inflated, of uniform height, but gradually 

 increase in breadth towards the base. There are indications of 

 pores in the constrictions. Total height of test =*41 mm. Height 

 of segments =045 mm. Breadth of basal or tenth segment 



