PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



EXPLANATION OF PLATE XII. 



PAGE 



Fig. i. CYRTOMA POSTHUMUM Ortm. ........ 60 



Patagonian beds ; Lake Pueyrredon, base. 



i a. Upper view of an individual with complete outline, and well 



preserved anal depression. 

 \b. Upper view of a partly broken individual, with ambulacra 



better preserved. 



Fig. 2. RETICULIPORA PATAGONICA Ortm. 68 



Patagonian beds ; mouth of Santa Cruz River. 

 2a. View of zoarium. 



26. Front view of a few branches of zoarium, slightly enlarged. 

 2c. Side view of one of the branches, more strongly enlarged. 

 Fig. 3. RHYNCHONELLA PLICIGERA v. Ih. . . . . ... 70 



Patagonian beds ; Lake Pueyrredon, base. 



30. Anterior view of an individual of average shape. 

 3<J. Front view of the same. 



y . Anterior view of a more elongate and triangular individual. 

 3f. Anterior view of an unusually broad individual. 

 Fig. 4. RHYNCHONELLA SQUAMOSA Hutt. ... .... 72 



Patagonian beds ; Lake Pueyrredon, base. 

 4#. Anterior view. 



4<J. Front view of the same individual. 

 FIG. 5. MAGELLANIA LENTICULARIS (Desh.). ..... 73 



Patagonian beds ; Lake Pueyrredon, base. 



5#. Anterior view of a rather large individual. 



5<5. Side view of the same. 



5<r. Anterior view of a smaller individual. 



All of the figures, unless otherwise stated, are natural size. 



(VOL. iv) 



