PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 
EXPLANATION OF PLATE XXXI. 
Fig. i. Dentalium sulcosum Sow. ...... 
Patagonian beds ; mouth of Santa Cruz River. 
i a. Five fragments, belonging to different individuals, put to- 
gether so as to show probable form of a complete individual. 
ib. View of upper end of uppermost fragment. 
Fig. 2. Dentalium octocostellatum Plsb. and Sh.- 
Patagonian beds; Mt. of Observation, upper horizon. Largest frag- 
ment present in the collection. 
Fig. 3. Calliostoma peraratum Cossm 
Patagonian beds ; mouth of Santa Cruz River. 
3a. Side view. 
3< b . The same, 2/1. 
Fig. 4. Calliostoma cossmanni Ortm. ....... 
Patagonian beds ; mouth of Santa Cruz River. 
4 a. Side view. 
4 b. The same, 3/1. 
Fig. 5. Calliostoma santacruzense Cossm. ...... 
Patagonian beds ; mouth of Santa Cruz River. 
5«. Side view. 
5 b. The same, 3/1. 
Fig. 6. Calliostoma garretti Ortm. 
Patagonian beds ; mouth of Santa Cruz River. 
6a. Side view. 
6 b. Portion of surface sculpture, enlarged. 
Fig. 7. Calliostoma iheringi Ortm. . ... ... 
Patagonian beds ; mouth of Santa Cruz River. 
7#. Side view. 
7^. Lower view. 
Fig. 8. Gibbula l^vis (Sow.) 
Patagonian beds ; mouth of Santa Cruz River. Upper view of speci- 
men imbedded in matrix. 
Fig. 9. Gibbula dalli v. Ih 
Patagonian beds ; mouth of Santa Cruz River. 
9 a. Side view. 
9 b. Upper view of the same individual. 
Fig. 10. Gibbula diametralis Cossm. . ..... 
Patagonian beds ; mouth of Santa Cruz River. 
10 a. Side view. 
10 b. Upper view of the same individual. 
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