ORTMANN : TERTIARY INVERTEBRATES. 
215 
Affinities : This is the first true Murex known from the Patagonian 
beds, and, indeed, the first that is referable without doubt to this genus 
from any South American Tertiary deposits, and it belongs in the sub- 
genus Phyllonotus Montf. Species of this type are hardly found before 
Miocene times, but are quite abundant in Miocene, Pliocene, and Recent 
beds. I cannot compare it with any known form,* none having a particu- 
larly close affinity to it, but on the whole it has a Neogene character. 
Gen. TROPHON Montf. 
145. Trophon patagonicus (Sowerby). 
PI. XXXIV, Fig. 7 a - d . 
1846 Fusus patagonicus Sowerby, in: Darwin, Geol. Observ. S. Amer., 
p. 259, pi. 4, f. 60. 
1897 Trophon laciniatus var. santacruzensis v. Ihering, in: Rev. Mus. 
Paul., v. 2, p. 294, pi. 3, f. 4. 
1897 T. patag. v. Ihering, ibid., p. 296. 
1899 T. p. v. Ihering, in: N. Jahrb. Miner., etc., v. 2, p. 31. 
1900 T. p. Ortmann, in: Amer. Journ. Sci., v. 10, p. 380. 
Shell ovato-oblong, with lamelliform varices. Whorls angulated, upper 
part, near the suture, flat, varices not extending upon this flat part, or 
only represented by growth-lines. Number of varices from 8-16, on the 
last whorl sometimes quite crowded, on the upper whorls more or less 
distant, elevated, and produced, on the angulation, into acuminate, often 
recurved lobes. Mouth subcircular or subovate, canal about as long as 
the mouth or a little shorter, umbilicus larger or smaller. Whole surface 
of shell, except upper flat part, with spiral striae, which are more or less 
distinct, often entirely obliterated. 
Measurements (not quite complete individual) : Height, 72 mm, diame- 
ter (varices included) 60 mm ; another one, with the upper end gone : 
Height, 82 mm, diameter, 75 mm; of a complete individual : Height, 63 
mm, diameter, 38 mm. 
Remarks: v. Ihering’ s T. laciniatus var. santacruzensis differs, at the 
first glance, considerably from Sowerby’s T. patagonicus : nevertheless, 
both are connected by numerous intermediate forms, so that it is impos- 
