48 BuivLKTlN I ( 48 ) 



vetusta Con. 

 Melaniaf vetusta Con., Foss. Sli. Tert. Form., 1833, p. 35. 

 Proto vetusta Con., Jour. Ac. Nat. Sci. Phila., vol. 7, 1834, p. 



146. 

 Turritella vetusta Con., 2d ed, Foss. Sh. &c. , 1835, p. 40, pi. 15, 



%• ^3- 

 Cerithium striatum \^<t2L, Cont. to Geol., Dec, 1833, p. 131, pi. 



4, fig. 122. 

 Mesalia vetusta Con., Amer.Jr. Conch,, vol. i, 1865, p. 33. 



vetustus Con. 

 Monoceros vetustus Con., Foss. Sh. Tert. Form., Nov. 1833. p. 44; 



pi. 15, fig. 3 of 2d ed., 1835. 

 M. pvruloides h&^, Cont. to Geol., 1833, p. 161, pi. 5, fig. 166. 

 M. fusiformisl^&Ti, idem, p. 162, pi. 5, fig. 167. 

 M. sulcatum Lea, idem, p. 162, pi. 5, fig. 168. 

 Pseudoliva vetusta Con. 

 Sjilcobuccinum i^Buccinoj'-bis) vetustus Con., Am. Jr. Conch., 1865, 



p. 22. ( 



vitis Con. 

 Siliquaria vitis Con., Foss. Sh. Tert. Form., Sept., 1833, p. 36; 



pi. 17, fig. 2 of 2d ed. 

 .S". claibornensis Lea, Cont. to Geol., 1833, p. 33, pi. i. fig. i. 

 Tenagoda. vitis Con., Anier. Jr. Conch., 1865, p. 33. 



Part II. — New or remarkable Claiborne sand species. 



MERTRIX 

 Meretrix perovata, var. aldrichi, nov. var. PI. i, fig. i. 



In collecting large quantities of this species at Claiborne, one 

 finds that it is subject to rather wide variations both as to form 

 and surface markings. The typical and most abundant form is 

 that figured on pi. 20 of Harris's republication of Fossil Shells &c. 

 {Cytherea comis Lea). This is comparatively small, smooth, gib- 

 bous about the umbones, and cuneate posteriorly. The variety a- 

 bove named is on the other hand large, elliptical, and with strong 

 concentric rugae on the anterior and posterior but not the middle. 



In the collection of the Phila. Ac. Nat. Sci., some specimens of 

 this variety are included under ' ' Cytherea perovata Con. ' ' while 

 others are among "C mortoni Con." 



That aldrichi is only a variety of perovata is proven by the abun- 

 dance of connecting forms. 



Type. — Collection of the State Museum, Austin, Tex. 



