PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
EXPLANATION OF PLATE XXXV. 
Fig. i. Marginella gracilior v. Ih. 
Patagonian beds ; mouth of Santa Cruz River. 
Back view of shell. 
Fig. 2. Marginella plicifera v. Ih. ....... 
Patagonian beds ; mouth of Santa Cruz River. 
Front view of shell. 
Fig. 3. Marginella olivella Ortm. ....... 
Patagonian beds ; mouth of Santa Cruz River. 
3<a. Front view of shell. 
3$. The same, 2/1. 
Fig. 4. VoLUTA TRIPLICATA Sow. ........ 
Patagonian beds ; mouth of Santa Cruz River. 
4 a. Front view of a large, typical individual. 
4^. Front view of a large individual, with less developed 
“shoulder.” 
4 c. Front view of a more slender individual, being transitional 
to V. gracilior v. Ih. 
4 d. Front view of a young individual, having the apex preserved. 
\e. View of the apex of the latter, enlarged. 
Fig. 5. VoLUTA GRACILIOR V. Ih. 
Patagonian beds ; mouth of Santa Cruz River. 
5 a. Front view of a large individual, which is typical in form 
(showing very high volutions), but has three columellar plaits. 
5 b. Front view of a fragmentary individual, showing distinctly 
only tivo plaits. 
5 c. Front view of a smaller individual, of more swollen outline, 
and less high volutions ; transitional to V. triplicata Sow. 
Fig. 6. Voluta petersoni Ortm. ........ 
Patagonian beds; mouth of Santa Cruz River, 250' above high tide. 
Front view of the only specimen in the collection. 
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All of the figures, unless otherwise stated, are natural size. 
(vol. iv) 
