12 Bulletin 8 178 



and separated bj' two or three spirals, giving the whorls a con- 

 stridled appearance in the centre; the tubercles are rather large; 

 suture linear, impressed. 



This form is quite distincft, but unfortunately the type and 

 only specimen on hand has been crushed so that only a frag- 

 mentary description is possible. The large, coarse tubercles are 

 quite peculiar and serve to distinguish the species from all others. 

 That part of fig. 5a which shows the tubercles on a smooth sur- 

 face has lost its outer layer. 



Locality. — Alabama: Matthews' Landing. 



Cerithiopsis conica n. sp., Pl. t, fig. 4. 



Shell small, slender, with four or five embryonic whorls which 

 are longitudinally striate, the following ten whorls as in figure; 

 sculpture consisting of three raised spirals equidistant on each 

 whorl, crossed by numerous raised ribs which are nodular at the 

 intersedlions; sutural area rather wide carrying in the bottom 

 of the trough a smaller spiral which is nodulous; base smooth; 

 canal short, strongly twisted. 



Differs from all other forms by the peculiar corded spiral at 

 the suture. 



Localities. — Alabama: Baker's Bluff on Tombigbee river near 

 St. Stephens; Claiborne sand horizon and White's 

 marl bed, Monroe county. 



Cerithiopsis fluviatills n. sp., Pl. i^ fig. 3. 



Shell small, with four or more embryonic whorls which are 

 striated axially with fine wavy lines, followed by eight or ten 

 whorls, these are ornamented with two raised spirals rather 

 coarse, which are cut into nodules by the two spirals on that 

 part of each whorl nearest the spire; bordering the base of each 

 whorl is another spiral sometimes smooth as in figure or smooth 

 on the body whorl and beaded strongly on the apical one, or 

 in one example with three beaded spirals ; suture strongly marked ; 

 base with two raised spirals near peripher}^ otherwise smooth, 

 except almost microscopic lines of growth; canal strongly twist- 

 ed. 



Several specimens were found, all differing from each other 

 in degree of ornamentation. The base of C. nassida appears to 

 be smooth while this is not. The third or lower spiral line is 

 farther from the middle one than it is from the upper one. 



