INSTITUTE OF SCIENCE, PHILADELPHIA. 33 



Drillia ebenina Dall. 

 Plate 2, figure 8. 



Miocene of Santo Domingo (Gabb) ; Pliocene of the Caloosahatchie beds. 

 Recent on the shores of the Gulf of Mexico, from Florida to Vera Cruz. 



Shell stout, fusiform, spire acutely pointed, color (in the recent form) dead 

 black, fading to very dark reddish brown ; whorls eleven, of which two be- 

 long to the smooth dark brown nucleus, which is minute ; last whorl more 

 than half the shell ; transverse sculpture (on the last whorl fifteen, beside the 

 varix) sharp, slightly elevated flexuous ribs, with much wider interspaces, 

 abrupt and largest where they begin in front of the fasciole and growing less 

 conspicious to the canal ; incremental lines perceptible, but not strong ; varix 

 large, rounded, swollen ; spiral sculpture of fine, uniform threads, with wider 

 interspaces, becoming coarser on the canal and more close-set toward the 

 suture ; these do not cut or nodulate the ribs on the periphery, but are well 

 marked between them ; behind the anal fasciole is a sharp, even keel with a 

 space between its edge and the margin of the suture; suture inconspicuous, 

 slightly appressed ; aperture short, narrow ; throat smooth ; canal short, wide ; 

 pillar straight, with no umbilical chink and very little callus except opposite 

 the notch ; notch circular, subtubular, nearly closed in front, not as wide as the 

 fasciole. Max. Ion. of shell 16.5 ; of aperture 7.0 ; of last whorl lo.o ; max. 

 lat. 6.5 mm. 



This fine species was first found living in shallow water on the Florida 

 Keys, by H. Hemphill. I find specimens of it together with several other 

 species confused together under the name oi Janmicense Guppy in the Gabb 

 collection at Philadelphia. 



Drillia quadrifasciata Gray. 

 Pleurotoma quadrifasciata Gray, Reeve, Conch. Icon., P/airotoma, pi. xxviii. fig. 251, 



Dec. 1845. 

 Pleurotoma quadrilineata C. B. Adams, Cont. to Conch., p. 64, 1850. 

 ? Pleurotoma trilineata Tryon, Man. vi. p. 368, not of Adams. 



Fossil, Caloosahatchie beds. Recent, Jamaica ; Samana Bay, Santo Do- 

 mingo, in 16 fathoms. 



The fossil form is the form described by Adams, which is a little smaller, as 

 a rule, than the original type of Reeve from Gray's cabinet. If a varietal name 

 be required, that of Adams might be used. 



Drillia sedilia n. s. 

 Plate 2, figure i. 

 Caloosahatchie beds, rare. 



Shell small, stout, strongly sculptured ; whorls about six, moderately 

 rounded; suture appressed, inconspicuous ; nucleus turbiniform, low, large for 

 the size of the shell, smoothest on top, transversely strongly, uniformly plicate 

 on the sides, with fine, spirally striate interspaces ; later whorls with three or 



