ORTMANN : TERTIARY INVERTEBRATES. 63 



atacamensis is very much higher than our species, and the vertex is pro- 

 duced over the anus. S. valdivianus comes nearer to our species, but the 

 anterior ambulacrum is said to be in a shallow groove, it is more narrowed 

 anteriorly, and the outline of the test is broader. It is hard to say whether 

 there is any closer relation to other fossil species. 



VERMES. 



CHAETOPODA. 

 TUBICOLA1 (SEDENTARIA). 



Gen. SERPULA L. 

 7. SERPULA PATAGONICA Ortmann. 



PI. XIII, Fig. 2. 

 1900 Serpula patagonica Ortmann, in: Amer. Journ. Sci., v. 10, p. 369. 



Tubes solid, calcareous, cylindrical, irregularly contorted and vermic- 

 ulate, growing upon shells, stones, etc. Outer surface transversely rugose. 

 Diameter : up to 3 mm. 



Remarks : I did not try to compare this species with any of the known 

 forms, since the characteristic features of these tubes are so very few, that 

 it is impossible to say whether it is a good species or not. It agrees well 

 with the short diagnosis given by Philippi (1887, p. 217) for S. colchag- 

 uensis from Navidad, but without material for comparison it is hard to 

 tell whether it is identical or not. It has been mentioned here only for 

 the sake of completeness. 



Record of specimens : San Julian, Oven Point; 5 large colonies, chiefly 

 on Pecten geminatus. San Julian, Darwin Station ; i colony, on a stone. 



Gen. TEREBELLA Cuv. 

 8. TEREBELLA MAGNA Ortmann. 



,Pl. XI, Fig. 5-.'. 

 1900 Terebella magna Ortmann, in: Amer. Journ. Sci., v. 10, p. 370. 



Large, cylindrical tubes, isolated or growing in groups of two or three, 

 straight or slightly and irregularly curved. Walls composed of large and 



