150 TRANSACTIONS OF THE WAGNER FREE 



Genus OOINEBRA Leach. 



Subgenus Favartia Fischer. 



The subgenus or section Favartia probably takes its rise in the Eocene. 

 Mur ex simplex K\dix\i:h. (1886, not Philippi, 1847) has much the appearance of 

 an Ocinebra from the figure, but I have not seen specimens. The so-called 

 variety aspinosa of Meyer, belongs to a different group, and has nothing to do 

 with the original simplex, if the figures can be relied on. M. simplex is from 

 the Upper Eocene (Vicksburg) ; M. Burnsii from the Lower Miocene (New 

 Jersey), while the species here referred to are of Pliocene age. 



Ocinebra (intermedia Adams var. ?) alta Dall. 

 ? Murex iniermedius C. B. Adams, Contr. to Conch., p. 60, 1850 ; not of Tryon. 

 Favartia intermedia Dal!, Blake Gastr., p. 211, 1889. 



Living from North Carolina to the Antilles and Bermuda. Fossil (the 

 variety) in the Pliocene marls of the Caloosahatchie and Shell Creek, Florida. 



0. celbdosa . 

 0. var. alta 

 0. intermedia . 



It will be observed by the above table, which gives the relative propor- 

 tions* of the three shells, that our fossil (while having the same number of 

 varices as the much more slender 0. intermedia) is intermediate between the 

 two recent species in its proportions, though in other respects agreeing with 

 them. The recent forms, of which I have been able to study a rather full 

 series, seem to be very constant as regards form, and the very few specimens of 

 the fossil I have seen are also constant. If this constancy is preserved in all 

 the fossils from the Florida Pliocene, this form will have specific rank, in which 

 case it may take the name of 0. alta ; but, considering the very limited material, 

 I prefer for the present to regard it as a variety of intermedia, with which it 

 agrees in many of its characters. 



Ocinebra cellulosa Conrad. 

 Murex cellulosa Conrad, Proc. Acad. Nat. Sci. Phila. iii. p. 25, 1846. 

 Ocenebra nuceus Morch (1850), Cat. Yoldi, p. 95, 1852. 

 Favartia cellulosa Dall, Blake Gastr., p. 210, pi. xvi. fig. i, 1889. 



Pliocene marls of the Caloosahatchie. 



Among the young specimens collected from the washed and sifted marl 

 two species are represented. The first is 0. alta ; the other (of which no adult 

 was collected) resembles exactly the young of 0. celbdosa of the same size. 

 I therefore refer it to that species until more material can be examined. It is 



* The two numbers in the second column refer to the distance from the suture behind the beginning of 

 the last whorl and from that behind the aperture, respectively, in an axial direction to the anterior end of the 

 canal. 



