PLATE 122. 



s 



CffiLOGRAPHIDA. 



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. CcelotJwlus octonus, n. sp., . . . x 100 1749 



One valve of the shell (A) 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 (6 1 , 6 2 ) with the mouth (m) of the 

 rhinocanna (<). The odd style (g 3 ) 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 (h), seen from the apical side ; t, rhinocanna ; m, 

 its month ; 6 1 , b\ the two lateral frenula ; g\ g*, the two paired 

 styles ; g*, 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. Coelothamnus 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. Coelothamnus bivalvis, n. sp., . . . . x 100 1751 



A single lateral anchor-pencil. 



Fig. 8. Coelothamnus 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 qnadridentate terminal spathilla. 



