PLATE 122. 



CcELOGRAPHIDA. 



Diam. Page 



Fig. 1. Ccelotholus octonus, n. sp., . . . x 30 1749 



The entire bivalved shell, seen obliquely from the dorsal and somewhat 

 from the right side, enveloped by the yellowish calymma. 



Fig. 2. Ccelotholus octonus, n. sp., . . . . x 100 1749 



One valve of the shell (h) with its large galea and the origin of the three 

 styles. The base of the two lateral styles (g 1 , g 2 ) is connected 

 by two latticed lateral frenula (b\ b 2 ) with the mouth (m) of the 

 rhinocanna (t). The odd style (g s ) is free. 



Fig. 3. Ccelothauma duodenum, n. sp., . . . x 20 1750 



The entire shell, seen from the dorsal side. The long styles are enveloped 

 by the yellowish calymma. 



Fig. 4. Ccelothauma duodenum, n. sp., . . . . x 80 1750 



One valve of the shell (A), seen from the apical side ; t, rhinocanna ; m, 

 its mouth ; & 1 , h 2 , the two lateral frenula ; g\ g 2 , the two paired 

 styles ; g z , the odd style. 



Fig. 5. Ccelothauma duodenum, n. sp., . . . x 80 1750 



One valve of the shell, seen in profile. Characters as in fig. 4. 



Fig. 6. Ccelothamnus bivalvis, n. sp., . . . x 30 1751 



The entire shell, enveloped by the yellowish calymma, seen from the 

 left side; between the two valves is the central capsule, with 

 nucleus and astropyle. 



Fig. 7. Ccelothamnus bivalvis, n. sp., . . . x 100 1751 



A single lateral anchor-pencil. 



Fig. 8. Ccelothamnus bivalvis, n. sp., . . . x 200 1751 



Distal end of a style, with its anchor-pencils. 



Fig. 9. Ccelothamnus bivalvis, n. sp., . . . . x 400 1751 



A single anchor-thread, with its quadridentate terminal spathilla. 



