ORTMANN ! TERTIARY INVERTEBRATES. 
EXPLANATION OF PLATE XI. 
Fig. T. ClDARIS ANTARCTICA Ortm. ........ 
Patagonian beds ; 30 miles north of upper Rio Chalia. 
1 a. Fragment of spine. 
1 b. Cross section of spine. 
1 c. View of articular surface of lower end of spine. 
1 d. Plate. 
Fig. 2. Hypechinus patagonensis (d’Orb.). ....... 
Patagonian beds; Darwin Station, San Julian. 
Upper view of the only specimen in the collection. 
Fig. 3. Toxopneustes precursor Ortm. ....... 
Patagonian beds ; Oven Point, San Julian. 
3 a. Upper view of a large specimen, slightly worn. 
3 A Side view of another specimen, 2/1. 
Fig. 4. ScUTELLA PATAGONENSIS Des. ........ 
Patagonian beds. 
4 a. “ Alate form,” adult, upper view ; Salt Lake. 
4 b. "Alate form,” young, lower view; Salt Lake. 
4 c. “Rotun date form,” medium size, upper view; Oven Point, 
San Julian. 
4 d. ‘‘Rotundate form,” adult, lower view ; Upper Rio Chalia. 
\e. "Rotundate form,” young, lower view; Oven Point, San 
Julian. 
Fig. 5. Terebella magna Ortm. . ........ 
Patagonian beds; Oven Point, San Julian. 
5 a. Isolated tube (with remains of another one), side view. 
5 b. View of terminal opening. 
Fig. 6. Cellaria fistulosa (L.) . 
Patagonian beds ; Shell Gap, Rio Chico. 
6 a. Fragment of a branch, showing achylosis on upper end. 
6b. A number of zocecia, enlarged. 
All of the figures, unless otherwise stated, are natural size. 
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