PATAGONIAN EXPEDITIONS ! PALAEONTOLOGY. 
EXPLANATION OF PLATE XXXVII. 
Fig. I. VoLUTA DOMEYKOANA Phil. . 
Patagonian beds ; mouth of Santa Cruz River. 
i a. Front view of a typical individual, with well-developed nodes, 
i b. Front view of an individual, with the nodes scarcely developed. 
Fig. 2. Genota cuevensis v. Ih. ........ 
Patagonian beds ; mouth of Santa Cruz River. 
Front view of an individual of medium size. 
Fig. 3. Drillia santacruzensis Ortm. ....... 
Patagonian beds ; mouth of Santa Cruz River. 
3<2. Front view of a well-preserved individual. 
2,b. The same, 3/1. 
Fig. 4. Borsonia patagonica Ortm. ........ 
Patagonian beds ; mouth of Santa Cruz River. 
4 a. Back view of a large individual. 
4 b. Front view of a partly broken individual, showing two colu- 
mellar plaits. 
4 c. Front view of a broken individual, showing only one plait, 
the lower one being obliterated. 
Fig. 5. Acteon chilensis Phil. 
Lower Magellanian beds ; Punta Arenas. 
5#. Front view of shell. 
5 b. The same, 3/1. 
Fig. 6. Acteon semilevis Ortm. ........ 
Patagonian beds ; Mount of Observation, upper horizon. 
6a. Front view of shell. 
6b. The same, 3/1. 
Fig. 7. Bulla remondi Phil. ......... 
Lower Magellanian beds ; Punta Arenas. 
7#. Front view of shell. 
7$. The same, 3/1. 
Fig. 8. Bulla patagonica v. Ih. ........ 
Patagonian beds ; mouth of Santa Cruz River. 
8a. Front view of a large individual. 
8b. Front view of a young individual. 
8c. The same, 3/1. 
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