ORTMANN : TERTIARY INVERTEBRATES. 
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patagonica , and this is certainly identical with our species. Besides, v. 
Ihering records from the Patagonian formation a C. patagonica , but it seems 
to me that this identification is not correct. He does not give any detailed 
description of this supposed C. patagonica , but (as has been said above) he 
has sent to the Princeton Museum 2 specimens of C. inccquatis under that 
name, so that there is no doubt that his C. patagonica is really C. inccquatis. 
If my presumption is correct that Sowerby's figure is enlarged, then it 
is beyond doubt that this small form represented in our collections is the 
typical C. patagonica. 
Hutton (1886, p. 364) identifies his Venericardia intermedia (1873, p. 
24) with “C. patagonica P but I am unable to say whether this species 
corresponds to our C. patagonica. 
Record of specimens : Mouth of Santa Cruz River ; 9 right, 4 left valves. 
Distribution : Santa Cruz (Sow.), ibid., Patagonian formation (v. Ih.); 
Jegua quemada, Suprapatagonian beds (v. Ih.). 
Affinities: Sowerby compares this species with the European Eocene 
C. acuticostata Lmck. (Wood, 1861, p. 142, pi. 22, f. 5), but there is hardly 
any close relation with it. 
C. caumotiensis Deshayes (i860, p. 774, pi. 61, f. 6-8) from the Eocene 
of France has a similar outline, but is much smaller and has more numer- 
ous and finer ribs. C. gramdata Say (Whitfield, 1894, p. 56, pi. 9, f. 
1-4) from the Miocene of New Jersey agrees in the slightly oblique outline 
and the number and character of ribs, but it is more circular and the apex 
more incurved. The most closely allied form seems to be : C. dunkeri Phil. 
(1846, p. 50, pi. 7, f. 7) from the Lower Oligocene of Germany. It agrees 
well in sculpture and outline, but the latter is more circular, with hardly an 
indication of triangular shape, and the apex is slightly more inclined. In 
this species also the hinge teeth of the right valve closely correspond to C. 
patagonica. 
Fam. LUCINIDAR Flem. 
Gen. LUCINA Brug. 
54. Lucina neglecta spec. nov. 
PI. XXVII, Fig. 3. 
Shell suborbicular, lentiform ; posterior dorsal margin slightly convex, 
forming an obtuse angle with the posterior margin. Anterior dorsal 
