PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
EXPLANATION OF PLATE XXXVI. 
Fig. I. VOLUTA DORBIGNYANA Phil. ........ 
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, 
i c. 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. ........ 
Patagonian beds ; Mt. of Observation, upper horizon. Front view of 
shell. 
Fig. 3. Cancellaria gracilis v. Ih. . . . . . . 
Patagonian beds ; Mount of Observation, upper horizon. 
3 a. Front view of shell. 
3$. The same, 3/1. 
Fig. 4. Cancellaria cf. medinoe Phil. ....... 
Patagonian beds ; Mt. of Observation, upper horizon. 
4 a. Front view of shell. 
4 b. The same, 3/1. 
Fig. 5. Terebra costellata Sow. ........ 
Patagonian beds ; mouth of Santa Cruz River. Front view of shell. 
Fig. 6 . Pleurotoma sub^equalis Sow. ....... 
Patagonian beds ; mouth of Santa Cruz River. Back view of the only 
specimen in the collection. 
Fig. 7. Pleurotoma unifascialis v. Ih. 
Patagonian beds ; mouth of Santa Cruz River. 
7^. Front view of the shell. 
jb. The same, 2/1. 
All of the figures, unless otherwise stated, are natural size. 
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