116 MESOZOIC AND CENOZOIC ECHINODEKMATA OF THE UNITED STATES. 



Cidaris perdttbius De Gi'egorio. 



Cidaris perdubius De Gregorio, 1890, Mon. faune eocenique Alabama, p. 253, PI. XLIV, fig. 2. 

 Cidaris perdubius Stefanini, 1911, Soc. geol. italiana Boll., vol. 30, p. 697. 



Description. — No specimens of this species were available for study. The type form 

 described by De Gregorio evidently came with other materials from the Claiborne in Alabama. 

 The author describes the species as follows: "Aculeus cylindraceus potius augustus, tenu tuber- 

 culatus; tuberculis densis, parvis, in series longitudinales recte dispositis." 



Locality. — Near Claiborne, Ala. 



Geologic liorizon. — Claiborne group, middle Eocene. 



Collection. — De Gregorio. 



Cidaris blandis De Gregorio. 



Cidaris blandis De Gregorio, 1S90, Mon. faune 6oc6nique Alabama, p. 253, PI. XLIV, fig. 4. . 

 Cidaris blandis Stefanini, 1911, Soc. geol. italiana Boll., vol. 30, p. 697. 



Description. — No specimens of this species were available for study. The type form 

 described by De Gregorio evidently came with other materials from the Claiborne group near 

 Claiborne, Ala. The author describes the species as follows: "Aculeus augusta, conoideo- 

 cylindraceus, costulis longitudinalibus ornatus; costis crenulatis, granulo-squamosis ; granulis 

 subimbricatis." 



Locality. — Near Claiborne, Ala. 



Geologic horizon. — Claiborne group, middle Eocene. 



Collection. — De Gregorio. 



Cidaris alabamensis Morton.. 



Cidaru alabamensis Morton, 1846, Acad. Nat. Sci. Philadelphia Proc, vol. 3, p. 51. 

 (?) Cidaris sp. Aldrich, 1886, Alabama Geol. Survey Bull. 1, p. 43. 

 Cidaris alabamensis Stefanini, 1911, Soc. geol. italiana Boll., vol. 30, p. 697. 



Description. — No material has been obtained that can be regarded as belonging to this 

 species, which Morton very inadequately describes and which he does not figure. Morton in his 

 description saj^s that this species is "Compressed, pentagonal, the angles rounded so as to form 

 a 10-sided figure. Ten rows of tubercles, with 9 or 10 in each row. Ambulacra arranged in 

 five pahs, with delicate, slightly oblique fissures separated by a double elevated line. Surface 

 between the tubercles and ambulacra finely granulated." Morton states that the specimen 

 described was found in the "Eocene strata of Washington County, Ala.," but if it was derived 

 from the St. Stephens limestone, as seems probable, it may be Oligocene, for the upper beds are 

 of that age. 



Locality. — Washington County, Ala. (Morton). 



Geologic horizon. — St. Stephens (?) limestone, Eocene (?). 



Collection. — Unknown. 



Cidaris sp. 



Cidaris sp. De Gregorio, 1890, Mon. faune eocenique Alabama, p. 252. 



Description. — The material representing this species is referred to by De Gregorio in these 

 words: "Auctor nullam descriptionem hujus specei dat." No figure is given. 



Locality. — Near Claiborne, Ala. 



Geologic horizon. — Claiborne group, middle Eocene. 



Collection. — De Gregorio. 



