114 TRANSACTIONS OP THE WAGNER FREE 



tinctly rayed., with an equal number of revolving beaded lines, the beads 

 most prominent on the umbilical line ; aperture orbicular, the border 

 nearly continuous ; umbilicus deep. 



Length (height), .18 inch; width of base, .2 inch. 



Closely resembles Solariorbis bclla, of Conrad, from the Claiborne 

 (Eocene) sands of Alabama, but the whorls in that shell are much more 

 angular, and have two equally prominent circumferential channels 

 instead of the single basal one seen in the Florida fossil. The generic 

 position of the species cannot be definitely determined. 



Genus PSEUDOTROCHUS, Heilprin. 



Shell turbinate, umbilicated, with the general aspect of the members 

 of the family Turbinidce or their allies, but differing in the siphonate 

 character of the aperture; aperture round, the lip continuous except at 

 the base, which is truncated through the formation of a sharply and ob- 

 liquely deflected short canal. 



I propose this genus for a rather anomalous shell, whose relationship 

 I cannot even guess at. As stated in the generic diagnosis it recalls in 

 habit the turbos, troques, or delphinulas, from which, however, it is 

 immediately separated by the apertural canal. It also in a measure 

 recalls Triclwtropis, but is of a much firmer and heavier build. Whether 

 or not the shell was nacreous in structure I am unable to say, as the 

 original material has been completely replaced by silica. I know of no 

 form, either recent or fossil, with which it can be said to be closely related. 



Pseudotroohus turbinatus, nov. sp. Fig. 57. 



Shell doubly turbinate, sloping about equally to base and apex; 

 whorls of the spire crenulated on the angulation immediately above the 

 suture, concentrically striated; body-whorl sharply angulated and 

 sub-carinated in the middle, the crenulations appearing as pseudo- 

 costulations, which are crossed by several transverse lines ; base of shell 

 pyramidally convex, concentrically ridged and lined ; aperture sub- 

 rotund, canaliculate; inner lip raised, and forming a border to the 

 umbilical sulcus. 



Length, .8 inch ; greatest width, .8 inch. 



Cerithium precursor, nov. sp. Fig. 58. 



Shell small, slender, of the general habit of the recent C. mitscantiu ; 

 whorls about ten, longitudinally plicated and concentrically ridged, the 

 ridges or lines about three on each of the whorls of the spire, five on 

 the body-whorl, which in some specimens exhibits one or more irregular 

 excrescences ; aperture oval, oblique, produced into a short canal. 



Length, .6 inch. 



