PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 



EXPLANATION OF PLATE XXXVI. 



PAGE 



Fig. I. VoLUTA DORBIGNYANA Phil. . . . . . . . . 230 



Patagonian beds ; mouth of Santa Cruz River. 



i a. Large, full grown individual, with spiral and longitudinal 

 sculpture obliterated (traces of the latter seen only on 

 upper whorls). 



ib. Young individual, with apex preserved. 

 ic. Apex of the latter, enlarged. 

 id. Specimen of medium size, with both spiral and longitudinal 



sculpture well preserved. 



le. Fragment of large individual, with longitudinal sculpture 

 partly obliterated, but spiral sculpture strongly pronounced. 

 This represents probably what v. Ihering calls V. alta. 

 Fig. 2. VOLUTA AMEGHINOI v. Ih. . . . . . . . . 233 



Patagonian beds ; Mt. of Observation, upper horizon. Front view of 

 shell. 



Fig. 3. CANCELLARIA GRACILIS v. Ih 235 



Patagonian beds ; Mount of Observation, upper horizon. 

 30. Front view of shell. 

 $b. The same, 3/1. 



Fig. 4. CANCELLARIA cf. MEDINA Phil. 236 



Patagonian beds ; Mt. of Observation, upper horizon. 

 4#. Front view of shell. 

 46. The same, 3/1. 



Fig. 5. TEREBRA COSTELLATA Sow 236 



Patagonian beds ; mouth of Santa Cruz River. Front view of shell. 

 Fig. 6. PLEUROTOMA SUB^EQUALIS Sow. . . . . . . . 238 



Patagonian beds ; mouth of Santa Cruz River. Back view of the only 

 specimen in the collection. 



Fig. 7. PLEUROTOMA UNIFASCIALIS v. Ih 239 



Patagonian beds ; mouth of Santa Cruz River. 

 ja. Front view of the shell. 

 76. The same, 2/1. 



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



(VOL. iv) 



