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797 

 TERTIARY FAUNA OF FLORIDA 



M. (B.) multimdiatiis Gabb, Pal. Cal., ii., p. 30, pi. 8, fig. 52, 1866. Miocene 

 of California. (Volsclla striata " Gabb," Meek, S. I. Checkl. Mio. Fos., p. 

 7, 1864, is probably a provisional manuscript name for this species.) 



There is a fine species in the Arago beds (Claibornian) of Oregon, which 

 is probably identical with one of the above; and I have another, as yet un- 

 identified, from the Oligocene limestone of Jacksonborough, Georgia. 



In the absence of authentic specimens of several of the above-mentioned 

 nominal species it would be imprudent to attempt to describe either of these 

 as new, while the wretched quality of a number of the figures renders an 

 identification from them impossible. 



Modiolus (Gregariella) minimus n. s. 

 Plate 35, Figure 26. 

 Shell small, broad, with turgid umbones in front, more or less attenuated 

 behind ; hinge-line arcuate, convex, the opposite margin nearly parallel and 

 concave, surface as in M. opifex Say. Alt. 8, lat. 3.5, diam. 4 mm. 



This little shell is represented by a silicious pseudomorph, retaining but 

 little of the external surface, from the Oligocene silex beds of Ballast Point, 

 Tampa Bay, Florida; the form is, however, unmistakable, and affords the 

 opportunity of recording this group from that horizon. 



Modiolus (Botula) cinnamomeus Lamarck. 

 Mytiltis cinnamoniinits, etc., Chemn., Conch. Cab., viii., p. 152, pi. 82, fig. 731, 1785. 

 Modiola cinnamoniea'Lzxn., An. s. Vert., vi., p. 114, 18 19; ed. Desh., vii., p. 25, 1835. 



Oligocene of the Chipola marl, Chipola River, Monroe County, Burns ; 

 of the silex beds at Ballast Point, Tampa Bay, Dall, and of Trinidad, West 

 Indies ; Pliocene marl of the Caloosahatchie, Dall ; recent, nestling or boring 

 into soft limestone rock or shell, from the vicinity of tape Fear, North Caro- 

 lina, to the West Indies. A valve from coral at Belize measures thirty-four 

 millimetres in length, but it is usually smaller. 



lam not able to determine whether the East Indian shell usually called 

 M. fusctis Gmelin is the same or distinct specifically. The distribution of 

 boring species is often ver}^ wide. It is certain, however, that Chemnitz's 

 specimens, on which Lamarck founded the species, were West Indian. It 

 seems remarkable that this species should be found in the Oligocene, but 

 I am not, from my present material, able to find any differential characters 

 whatever from recent specimens of the same size. 



