INSTITUTE OF SCIENCE, PHILADELPHIA. 155 



Oymia Woodii Dall. 



Fasciolaria Woodii Gabb, Journ. Acad. Nat. Sci. Phila. 2d series, iv. p. 375, pi. 67, fig. 7, 



i860 ; Conrad, Proc. Acad. Nat. Sci. xiv. p. 561, 1863 ; Meek, Smithsonian Checklist 



Inv. Foss. Miocene, p. 21, 1864. 

 Fasciolina Woodii Conrad, Am. Journ. Conch, iii. p. 186, 1867. 

 Cuma ieciui/iGahh, Trans. Am. Phil. Soc, n. s., vol. xv. p. 214, 1873 (not of Wood or Kie- 



ner). 

 Compare Triionopsis subalveatum Conrad, Journ. Acad, Nat. Sci., 2dser., ii. p. 41, pi. i, 



figs. 2, 8, 1850 = Triton subalveatum Conr., op. cit. i. p. 207, 1849. 



Miocene of New Jersey, in the Shiloh marls ; Texas (Meek) and of Santo 

 Domingo (Gabb). 



On examining the unique type of Gabb's Fasciolaria Woodii, I saw at once 

 that it is "a typical Cymia ; but my astonishment was great when, on looking 

 over the large series of the Miocene fossil from Santo Domingo which Gabb 

 had referred to Cuma tecttmi, I found that the two could not be separated 

 specifically and that neither should be referred to C. tectum. The C. Woodii 

 is a very variable shell, with or without tubercles and peripheral carina, and 

 varying much as some Purpuras do. The fine series at Philadelphia shows 

 this well, and among the smoother varieties the exact duplicate of the New 

 Jersey fossil can easily be found. 



The genuine Cymia exists in a recent state only over a limited area on the 

 western coast of Central America, where the typical species is found. The 

 discovery of the genus in a fossil state on the eastern side of the continent is 

 therefore very interesting. The small distribution of C. tectum would har- 

 monize with the hypothesis that the group had barely reached the Pacific, 

 from a Miocene Antillean center of development, when the communication be- 

 tween the two seas was cut off — an event accompanied by geological changes 

 in the Antilles which exterminated the parent stock. 



Cymia is to Purpura what Monoptygma is to Oliva or Olivella. 



There have been two fossil species described from America under the 

 name of Cuma — C alternata Nelson (Tr. Conn. Acad. ii. p. 198, pi. 7, figs. 3, 

 4, 1870), and C. biplicata Gabb (Geol. Surv. Cala., Pal. ii. pp. g, 75, pi. ii. fig. 14, 

 1869), from Peru and California. Neither belongs to the genus Cymia as 

 properly restricted ; both are probably Purpuras. Cymia is not known on the 

 coast of Chile, either as a fossil or in the living state. 



Subfamily CORALLIOPHILIN^E. 



Genus CORALLIOPHILA Adams. 



Coralliopliila magna n. s. 



Plate II, figures 11, 12. 



Ballast Point silex-beds, Dall and Burns. 



Adult shell large, stout, with eight or nine whorls, a short spire, rasp-like 

 surface and flaring umbilicus ; nucleus small, smooth ; subsequent whorls 

 transversely sculptured, with seven or eight more or less prominent, rounded 



