PLATE 1. 



16 



Miliolina (B). 



FIG. 3. Lagena-form. Cell calcareous ; form oval ; neck with orifice passing 



along the external form; pseudopodial pits quite distinct ; Miliolina 

 Bicornis. 



FIG. 2. 



Spirilini Cornuspirce. A simple spiral shell without chambers; tube 

 undivided ; convolutions in contact ; aperture, diameter of tube, and 

 simple ; crest or crown of she! I striated. 





Diatomaceae. 



PLATE 2. Coscinodiscii (x600; diameter .003 inch). The forms are both 

 an interesting and beautiful group ; the most common are C eccentricus 

 and C minor, of which latter were in great numbers. The beautiful 

 c ^ sc> nere n g ure( l as No. 1, shews that each frustule is distinctly and 



Long. 23" w. regularly formed of sexagonal shape. In this particular species the 

 areolse in the centre are largest, decreasing towards the edge, the 

 margin finished by a double row of cells set vertically ; the lines formed 

 by the cells are both radiating and eccentric, resembling the orna- 

 mental engine turning on the back of a watch.* 



FIO. 2. Actinoptyclius (.003 about). Valves convex ; cells circular ; larger 



Q about the centre and margin; margin spinous; valve with six rays; it 



is not improbable that this is the form above named, although the 



side view A hardly gives the undulating form which this species 



possesses. 



* The hoops or zones which united the valves of the Coscinodiscus were found .in 

 great numbers, broken in irregular fragments ; but the number of valves found did not 

 at all coincide with the zones which united them. 



