78 Cincinnaii Society of Natnial Histoty. 



NOTES ON TERTIARY FOSSILS, WITH DESCRIPTIONS 

 OF NEW SPECIES. 

 Bv Trujman H. Aldrich. 

 (Read by title, December 7th, 1886 ) 

 I. 

 The following notes upon some imperfectly known or described 

 fossils are here given, and are based upon careful examinations of 

 the types or perfectly authenticated specimens. The list of Texas 

 species is given from specimens in my cabinet, a few new species 

 of especial interest are also described herein. 

 Planaria NiTENS, Lea. 



This minute shell was first described in the " Contributions to 

 Geology," 1833, and was placed in the genus Planaria, Brown, 

 with doubt. Finding that the genus itself was founded on young 

 specimens of Plaiiorhis (See Jeffrey's British Conchology, vol. 

 iv, p. 68), it was necesary to find where this species really be- 

 longed. It is evidently the embryonic shell of Solarium, and can be 

 ■clearly seen on many specimens of this genus, belonging to differ- 

 ent species, especially on well preserved specimens. My cabinet 

 contains a specimen with part of the adult whorl attached to the 

 reflected lip ; also, a specimen worked out from Solarium incckianin/i 

 Gabb (see wood cut,) etjual to the form described as Planaria 

 nitcns, Lea., and a further specimen from Jackson, Miss., containing 

 half a whorl of adult Solarium attached to the eml)ryonic shell. 



Ntuieiis of .S. w,;-kiani(ni, Gahb, equal Planaria nilciis Lea, Iroiii WhceUn-k, Texas. 



Whenever the genus Solarium is found this little shell also ap- 

 pears, when searched for. 



TuRBONiLLA [Chemnitzia] trigemmata, Con. 



This species was first described in i860, under the above 

 name, but in 1865 (vol. i, p. 27, Am. Jour. Conch.), anew 



