400 TRANSACTIONS OF THE WAGNER FREE 



of Maryland, is probably a distinct species, though allied to eboreuni. It differs 

 from the latter in its more depressed form, doubly carinate periphery, 

 excavated upper surface of the whorls (in most specimens), and absence of 

 spiral striation. However, these early forms are so variable that a connecting 

 series may possibly turn up with further exploration. 



Calliostoma aphelium n. s. 

 Plate 22, figure 29. 



Chesapeake Miocene of Calvert Cliffs and Jones's Wharf, Maryland, 

 Burns and Harris. 



Shell small, somewhat depressed, with five whorls ; suture impressed, 

 not channelled ; upper surface of the whorls smooth except for lines of growth 

 and nearly invisible obsolete spiral markings, somewhat flattened ; periphery 

 prominent, almost carinated ; base slightly rounded, without sculpture ; 

 umbilicus represented by a deep imperforate pit ; umbilical fasciole strong, 

 callous, irregularly vertically striated ; aperture subquadrate, outer lip simple, 

 sharp ; inner lip broad, with a callous knob upon it ; body with a thin wash of 

 callus. Alt. of shell 7 ; max. diam. 9 mm. 



This simple little shell recalls C. eborenm Wagner and C. Han-isti Dall, 

 but seems sufficiently distinct from both ; C. nitens resembles it somewhat, 

 but is more compact, depressed and, relatively, very much more massive. 



Calliostoma nitens Lea. 

 Plate 22, figure 30. 



Turbo nitens Lea, Contr. Geol., p. 125, pi. 4, fig. 115, 1833. 

 Solariorbis nitens Conrad, Delphinula nitens De Gregorio. 



Eocene of the Claiborne sands, Claiborne, Alabama. 



Shell small, solid, depressed, with five whorls, smooth except for lines of 

 growth ; surface polished, suture impressed ; periphery subangulate ; base 

 slightly rounded, with a minute central perforation ; umbilical carina simple^ 

 rounded, the wall ' above it excavated ; umbilical fasciole feebly marked ; 

 aperture oblique, subrotundate, with a moderate callus on the body and a 

 small prominence on the pillar. Alt. 4 ; max. diam. 6 rrMTi. 



This little shell is most likely to be confounded with Dillwynella 

 naticoides, from which its heavy nacreous layer, depressed form and perforate 

 umbilicus are sufficient, when observed, to discriminate it. Though usually 

 perforate, it seems to belong here rather than in EutrocJms. It seems common 

 at Claiborne. 



Calliostoma erosum n. s. 

 Plate 18, figure 7. 

 Croatan Pliocene beds of the Neuse River, North Carolina, C. W. John- 

 son. 



