PATAGONIAN EXPEDITIONS I PAL/EONTOLOGY. 



EXPLANATION OF PLATE XXXV. 



PAGE 



Fig. i. MARGINELLA GRACILIOR v. Ih. . . . . . . . 224 



Patagonian beds ; mouth of Santa Cruz River. 



Back view of shell. 

 Fig. 2. MARGINELLA PLICIFERA v. Ih. ....... 225 



Patagonian beds ; mouth of Santa Cruz River. 



Front view of shell. 

 Fig. 3. MARGINELLA OLIVELLA Ortm. ....... 225 



Patagonian beds ; mouth of Santa Cruz River. 

 30. Front view of shell. 

 3<5. The same, 2/1. 



Fig. 4. VOLUTA TRIPLICATA Sow. . . . . . . . . 226 



Patagonian beds ; mouth of Santa Cruz River. 



40. Front view of a large, typical individual. 



Afb. Front view of a large individual, with less developed 



"shoulder." 

 4^. Front view of a more slender individual, being transitional 



to V. gracilior v. Ih. 



40!. Front view of a young individual, having the apex preserved. 

 4<?. View of the apex of the latter, enlarged. 

 Fig. 5. VOLUTA GRACILIOR v. Ih. . . . . . . . . 227 



Patagonian beds ; mouth of Santa Cruz River. 



50. Front view of a large individual, which is typical in form 



(showing very high volutions), but has three columellar plaits. 



$b. Front view of a fragmentary individual, showing distinctly 



only two plaits. 



5<r. Front view of a smaller individual, of more swollen outline, 

 and less high volutions ; transitional to V. triplicata Sow. 

 Fig. 6. VOLUTA PETERSONI Ortm. . . . . . . . . 229 



Patagonian beds; mouth of Santa Cruz River, 250' above high tide. 

 Front view of the only specimen in the collection. 



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



(VOL. iv) 



