loo Bulletin ii lOO 



The best Lignitic specimen we have is from Woods bluff, and 

 is shown by the figure. It varies slightly from the Claiborne 

 type in having a little more prominent granules above, but not 

 quite so prominent near the umbilicus. The shell is thick and 

 shows distincftly where the operculum fitted in. Also at Hatch- 

 etigbee. 



Type. — Acad. N&t. Sci. Phila. L,ea colledlion. 



Solariella louisiana, PI. 12, fig. 18. 



Syn. Solarium elegans var. Aid., Geol. Surv. Ala., Bull, i, 1886, pp. 

 50, 51- 

 S. louisiana Dall, Trans. Wag., etc., vol. 3, p. 407, 1893. 

 5. sylvcsrupis Har., Proc. Ac. Nat. Sci. Phila., 1896, p. 477. 

 5". louisiana Dall, Trans. Wag., etc., vol. 3, pi. 23, fig's, i, i a, 1898. 



Dairs original description. — "Shell small, subconical, with five 

 or six whorls; nucleus small; whorls rounded, with a flattened 

 space in front of the suture, which is distinct and sometimes even 

 slightly channeled; the flattened area is bounded anteriorly by an 

 elevated spiral thread, which especially on the earlier whorls is 

 more or less distindlly beaded; besides this the surface is sculp- 

 tured with spiral grooves separated by about equal interspaces 

 and crossed obliquely by numerous impressed lines, rather evenl}^ 

 spaced and in harmony with the lines of growth; the sculpture 

 throughout is stronger on the upper part of the whorls and on 

 the earlier whorls; on the last whorl it is more or less obsolete in 

 nearly all the specimens; the periphery is evenly rounded; the 

 base slightly flattened; the umbilicus large and funicular, its 

 walls sculptured in both directions, the spirals distincftly beaded; 

 the umbilical carina is crenate, with a narrow sulcus formed by 

 two or three impressed lines, outside of the carina; aperture very 

 oblique, rounded, thin-edged, hardly interrupted by the body 

 whorl or umbilical carina. Altitude of two specimens, A and B, 

 A 7, B 5.5; max. diam., A 8.5, B 7.00 mm. 



"This species has been generally confounded with S. elegans, 

 which is a less elevated shell, with a scalar umbilicus and gener- 

 ally with several elevated, rather distant spirals and more promi- 

 nent sculpture." 



The shell is beautifully nacreous just beneath the surface 

 layers, which are often more or less exfoliated. When 



