76 



BUI.I.KTIN 39 



Genus GLYPHOSTOMA Gabb 

 GIpyhostoma dentifera, Gabb. 



Glyphostoma dentifera Gabb, 1872, Proc. Acad. Nat. Sci. Phila., vol. 



24, p. 270, pi. II, fig. 4. 

 Glyphostoma dentifera Gabb, 1873, Trans. Amer. Phil. Soc. vol. 15, p. 



210. 



Glyphostoma dentifera Dall, 1889, Ball. Mus. Comp. Zool., vol. 18, 

 pt. 2, p. 108, 



Glyphostoma dentifera Cossmann, 19 13, Jour, de Conchyliologie, vol. 



61, p. 31, pi. 2, figs. 15, 16, 17. 

 Glyphostoma dentifera Maury, 1917, Bull. Amer. Pal., vol. 5, p. 225, 



pi. 9, fig. 16. 



A single specimen of this species was collected from the cor- 

 alline phase of the Gatun, near Port Limon. The shell showing 

 5 whorls (apex lost), measures 18 by 8 mm. The pecular sha- 

 greening, characteristic of the genus is strong and easily seen. 



This shell agrees closely with the figure given by Cossmann, 

 based on a Dominican specimen. It diifers in several respects 

 from the specimen figured by Dr. Maury in her Dominican Fos- 

 sils from a metat3^pe, sent by Professor Gabb to the Cornell Mu- 

 seum. Dr. Maury's shell is larger, has a longer spire, and the 

 microscopic shagreening is much finer. 



Dall in the Blake Report, doubtfully refers to this species, 

 an imperfect specimen collected in 15 fathoms of water at Sand 

 Keys. 



Gatun Stage: Port JLimon. 



Glyphostoma moinica, n. sp. Plate 5, figures 29, 30 



Shell small, solid with a coarse, tuberculate, subreticulate 

 sculpture and a thickened, enlarged outer lip; nucleus small, 

 pointed and tapering of 3 or more, smooth, convex whorls fol- 

 lowed by about 4 post-nuclear; the sculpture consists of about 

 14 narrow ribs continuous from the canal to the upper suture 

 and crossed by even, spiral cords; their intersection form small 



