ORTMANN ! TERTIARY INVERTEBRATES. 
26 l 
again ; and Voluta alta was probably wrongly identified (see p. 232). 
Thus we may say, that Sowerby and Darwin have added to the only 
known species {Hyp echinus patagonensis ), 23 new species, bringing up 
the number of species to 24. 
In 1846, Desor adds Scutella patagonensis and Echinarachnius juliensis, 
which are now regarded as identical, giving 25 as the total number of 
Patagonian species. 
No additions to our knowledge of the Patagonian fauna were made till 
1885, when Rochebnme and Mabille described the following new species : 
Photinula detecta , Natica secunda and Natica omoia. 
Only N. secunda has been recognized subsequently, and, owing to the 
poor descriptions and lack of figures, we can add only this one to the well 
established species of the Patagonian fauna, giving the number 26. 
In 1887 Philippi described the following new species from Santa Cruz: 
1 . Nucida patagonica. 
2. Area darwini ( Cucullcea d.). 
3. Cardita incequalis. 
4. Lucina promaucana. 
5. Fimbria (?) patagonica. 
6 . Cardium midtiradiatum {C. philippii). 
7. Cardium pisum. 
8 . Venus darwini. 
9. Venus patagonica. 
10. Venus leeviuscula (. Dosinia /.). 
11. Psammobia patagonica. 
12. Pholas patagonica {Marts si a pi). 
13. Trochita sp. (? Infundibulum corrugatwn). 
14. Natica famida ( N '. ovoidea). 
15 . Ficida Carolina ( Pynda cl). 
16. Voluta gracilis ( V. gracilior). 
1 7. Voluta dorbignya?ia. 
18. Cancellaria viclali. 
19. Ca7icer patagonicus ( Geryon peruviamis). 
Of these 19 species, 16 are represented in our collection; of the rest 
Venus patagonica and Cancellaria vidali are well characterized forms, 
while Fimbria patagonica needs confirmation. Thus we may add safely 
1 8 species to the Patagonian fauna, which brings the total number up to 44. 
Rochebrune and Mabille in 1889 added the following species: 
Dentalium patagonicum (D. sulcosuni). Turritella elachista. 
Photinula resurrecta. Terebra undidifera (probably T. costellata). 
Turritella couteaudi (T. breantiana). 
Only two of these species, Dentalium patagonicum and Turritella cou- 
teaudi , and the existence of the genus Terebra have been verified, the 
other species must be regarded as doubtful, owing to the unsatisfactory 
descriptions. Thus the number of well established Patagonian species 
would be 4p 
