298 PROCEEDINGS OF THE ACADEMY OF [1889. 



Tournai, Belgium. The transverse ribs of the latter are, however, 

 slightly farther apart. 



Three additional species of Bellerophon have also been described 

 from Burlington. These are B. scriptifervs White, B. vinculatw 

 White and Whitfield, and B. perelegan* White and Whitfield. 



Metoptoma 1 undata Winchell. 



Metoptoma undata Winchell, 1865. Proc. Acad. Nat. Sci. Phila., 

 p. 131. 



A single specimen represented in the collections probably belongs 

 to this species. 



Porcellia crassinoda White and Whitfield. 



Poreettia crassinoda White and Whitfield, 18(32. Proc. Boston 

 Soc. Nat. Hist,, vol. VIII, p. 303. 



No traces of this group have been noticed recently, except portiors 

 of a large cast, probably belonging to this species. The other time 

 forms reported from the Burlington locality are P. obl'tquinoia 

 White, P. rectinoda Winchell, and P. nodosa Hall. 



Among the gasteropods that have been recorded from the rocksat 

 Burlington, but which have not been observed since the appearaice 

 of the original descriptions, are two species of Holopea — H. corica 

 and H. subconica, described by Winchell from the Kinderhook bids. 

 Associated with these two forms is a third diminutive shell, ap>ar- 

 ently belonging to the Turboniche— Holopella mira Winchell. A 

 cast in sandstone has received the name Loxoitema oligospira Vin- 

 chell. Dentalium grandozvum Winchell, a form said to resembe D. 

 venustum Meek and Worthen, is the only representative oi tins 

 group recognized from the locality. No specimens of Pletirotonaria 

 have been obtained lately. 



