PATAGONIAN EXPEDITIONS : PALEONTOLOGY. 
EXPLANATION OF PLATE XII. 
Fig. i. Cyrtoma posthumum Ortm. ........ 
Patagonian beds ; Lake Pueyrredon, base. 
i a. Upper view of an individual with complete outline, and well 
preserved anal depression. 
ib. Upper view of a partly broken individual, with ambulacra 
better preserved. 
Fig. 2. Reticulipora patagonica Ortm. ••••••• 
Patagonian beds ; mouth of Santa Cruz River. 
2 a. View of zoarium. 
2 b. Front view of a few branches of zoarium, slightly enlarged. 
2 c. Side view of one of the branches, more strongly enlarged. 
Fig. 3. Rhynchonella plicigera v. Ih. 
Patagonian beds ; Lake Pueyrredon, base. 
3#. Anterior view of an individual of average shape. 
$b. Front view of the same. 
3c. Anterior view of a more elongate and triangular individual. 
$d. Anterior view of an unusually broad individual. 
Fig. 4. Rhynchonella squamosa Hutt. ... ... 
Patagonian beds ; Lake Pueyrredon, base. 
4 a. Anterior view. 
4<5. Front view of the same individual. 
Fig. 5. Magellania lenticularis (Desh.). ..... 
Patagonian beds ; Lake Pueyrredon, base. 
5 a. Anterior view of a rather large individual. 
5 b. Side view of the same. 
5 c. Anterior view of a smaller individual. 
All of the figures, unless otherwise stated, are natural size. 
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