. Bulletins of American paleontology. 34 Bulletin 366 Table 7.—Measuremenls (in mm) iif Lepicvrluini Iwptafidnii (Gabb. 1873). Height/ Restored width Specimen height Width ratio ANSP 2913 ANSP 79133 PRI 28656 NMB locality 16821 NMB locality 16842 12.(1 NMB locality 1691 (J NMB locality 16912 NMB locality 16914 NMB locality 16932 I7.(J is given by Pemlliat (1972, p. I I. Hg. I). Akers (1972, p. 30) assigned those beds to the Agueguexquite For- mation, w
. Bulletins of American paleontology. 34 Bulletin 366 Table 7.—Measuremenls (in mm) iif Lepicvrluini Iwptafidnii (Gabb. 1873). Height/ Restored width Specimen height Width ratio ANSP 2913 ANSP 79133 PRI 28656 NMB locality 16821 NMB locality 16842 12.(1 NMB locality 1691 (J NMB locality 16912 NMB locality 16914 NMB locality 16932 I7.(J is given by Pemlliat (1972, p. I I. Hg. I). Akers (1972, p. 30) assigned those beds to the Agueguexquite For- mation, which he dated as Middle to Late Pliocene. Later Akers (1979, p. 497) introduced the natne "Me- dias Aguas Forination" stating that it "will be desig- nated in a subsequent report (Tulane Studies in Geol- ogy and Paleontology) for unnamed beds of upper Miocene age (Zone N17)". This promised paper, how- ever, never appeared, and the Medias Aguas Formation is therefore a nomeu inidiiin. For further discussion of the Santa Rosa beds reference is made to Yokes (1994. p. 138) and Vermeij and Yokes (1997, p. 84). Perrilliat had six specimens from the same locality (USGS 23737) at hand, when she described her L. hep- tagona. The present writer has seen five of them. The sixth specimen was not available; it has been figured by Pemlliat (1973, pi. 28, figs. 11-12) carrying the number IGM2413. and is deposited in the Instituto de Geologia of the Universidad Nacional Autonoma de Mexico. The dimensions given by Perrilliat show that this is a Lepicythara of large size like L. lieprai;oiia from the Dominican Republic. The number of axial ribs per whorl ranges from seven on early whorls to nine on late whorls like in L. heptcigona from the Do- minican Republic. The specimen figured here (Text-fig. 33) has an in- complete protoconch. but its last part shows eleven opisthocline to slightly opisthocyrt axial riblets. The number of its teleoconch whorls is The first te-
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