GASTROPODA— CERITHIIDJE. 749 



a reflexed inner lip. Sculpture in the form of vertical rows of 

 fine nodules. 



Edwards limestone of Texas. 



483. C. (?) austinensis Roemer. (Fig. 1084, £.) Comanchic. 

 Round-whorled with pronounced round ribs and 6-8 strong 



spirals, continuous across the ribs, and frequently with intercalated 

 finer ones. Aperture with short, curved canal. 

 Edwards limestone of Texas. 



484. C. (Newtoniella) conicum Aldrich. Eocenic. 

 Small and slender, sutures depressed ; sides of whorls nearly 



flat with uniform distant ribs, crossed and somewhat 

 rounded by three strong spirals ; a fourth, nearly cov- 

 ered at the suture by the succeeding whorl, gives the 

 characteristic appearance to the shell. 

 Claibornian of Alabama. 



485. C. (Cerithiopsis) fluviatile Aldrich. Eocenic. 

 Differs from the preceding in the absence of the 



spiral at the suture and the freedom from nodes of the 

 first spiral above the suture. jr IG I0 g^ 



Chickasawan (Lignitic) of Alabama. Centhium{Se- 



486. C. (Seila) adamsii H. C. Lea. (Fig. 1085.) j Md. stvT' 



Oligocenic to Recent. 



Small (length 7 mm.), slender, whorls flat, suture not impressed, 

 about four equal spirals with equal interspaces, strong anterior 

 and fainter posterior notch in aperture. 



Chipolan beds of Florida, Miocenic of Virginia and North Caro- 

 lina, Croatan beds (Pliocenic) of North Carolina ; Waccamaw beds 

 of South Carolina, Caloosahatchie of Florida, Post-Pliocenic of 

 Atlantic and Gulf States ; living on South Atlantic coast of U. S. 



487. C. (Potamides [Tympanotonus] ) hillsboroense Heilprin. 

 (Fig. 1086.) Oligocenic. 

 Suture loose ; whorls flat or slightly concave ; upper spiral 



strongly nodose ; next below, thin and finely granulose ; third, 

 coarser and nodose and the fourth, just above the suture, smooth. 

 Orbitoides limestone of Florida. 



488. C. (Rhinoclavis) caloosa'ensis Dall. (Fig. 1087.) Pliocenic. 

 Ornamentation of whorls complex, consisting of coarse and fine 



spirals, some traversed by ribs, others noded. The body whorl is 



