ORTMANN : TERTIARY INVERTEBRATES. 
195 
In the American Tertiary we have one species that is apparently very 
closely allied to ours : T. apicalis Heilprin from the Pliocene beds of 
Florida. Especially in what Dali (1892, p. 316, pi. 16, f. 10) calls the 
typical form of T. apicalis , there are two principal ribs, on the upper and 
lower part of each whorl, with a third and smaller intermediate one, and 
besides, a number of fine spiral striae: a type of ornamentation that 
agrees completely with that of T. ambulacrum. (I have compared and 
verified this character in 6 specimens of this form from the Caloosahatchie 
beds in the Princeton Museum). In T. apicalis , however, the principal 
ribs are distinctly and regularly granulated, and the suture is less deep. 
Thus T. apicalis corresponds very closely to T. cingulatiformis of Moe- 
ricke (Pliocene of Chili), which is, according to Moericke, the Pliocene 
descendant of T. affinis = ambulacrum of the Navidad beds. 
This comparison of the morphological characters of T. ambulacrum 
with those of T. apicalis would accordingly, for T. ambulacrum , point to 
an age a little older than that of the Pliocene T. apicalis , i. e., to Miocene. 
T. aldingce Tate (1893, p. 336, pi. 8, f. 1) from the so-called “Eocene” 
of South Australia (Aldinga Bay) comes very near to T. ambulacrum , 
but the suture is not so deep. 
125. Turritella breantiana d’Orbigny. 
PI. XXXI, Fig. i 4 a ' b . 
1847 ^ breantiana d’Orbigny, in: Voy. Astrolabe et Zelee, Geol. Atlas, 
pi. 5 (Paleont., pi. 2), f. 36, 37. 
1887 T. breantiana Philippi, Tert. & Quart. Verst. Chiles, p. 77, pi. 9, f. ib. 
1889 T. couteaudi Rochebrune & Mabille, in: Miss. Cap Horn, v. 6, p. 
44 (no locality). 
1897 ^ tricincta v. Ihering, in: Rev. Mus. Paul., v. 2, p. 287, pi. 3, f. 3 
(non T. tricincta Hutton, 1873, p. 13). 
1898 T. iheringi Cossmann, in: Rev. crit. Paleozool., v. 2, p. 109. 
1899 T. iheringi Ameghino, in: Seg. Cens. Nac. Rep. Argent. Supl., p. 4. 
1899 T. breantiana var. indecussata v. Ihering, in: N. Jahrb. Miner., etc., 
v. 2, p. 26. 
Shell large, very elongate, forming an angle of about 12 to 16 0 . Suture 
not very deep, whorls flat with 3 thick principal revolving ribs, the upper- 
most the strongest. Ribs, especially the uppermost, crossed by lines of 
