Harris — Eocene Deposits of Maryland and Virginia. 303 



toni from Aquia Creek, Virginia ; characterized by its rather 

 smaller size, plainer surface, extremely sharp basal carina. See 

 figs. 1, 2, and 3. 



Turritella humerosa Conrad ; abundant in several varietal 

 forms in the Bell's Landing sub-stage ; common in Maryland 

 and Virginia. This species ranges from the Midway to the 

 Claiborne inclusive, but seems exceptionally well developed at 

 this horizon. 



Turritella prceeincta Conrad ; very common in the Bell's 

 Landing sub-stage of Ala. ; rare at Aquia Creek, Va. The 

 Virginia specimens are less strongly carinated than their Ala- 

 bama representatives. 



Natica, species probably new, from Bell's Landing and 

 Maryland. 



Besides these, other species can be mentioned that are found 

 in common in the Pamunkey and the Alabama Lignitic. Here 

 may be included Volutilithes petrosa, var. htomeyi, Levifusus 

 trabeatus var., and perhaps Gyiherea, ovata Rogers, which is 

 likely to prove the same as C. nuttalliopsis of Heilprin. 



The fauna of the Bell's Landing sub-stage is much more 

 varied, i. e., contains a far greater number of species than does 

 that of the Eocene of Maryland and Virginia. As a rule, such 

 species as survive in the later stages of this series are here rep- 

 resented by unusually large varieties. While those that are 

 common to this and the Maryland and Virginia deposits are 

 dwarfed or comparatively smaller than their northern represen- 

 tatives. This however, does not invariably hold true. 



As far as is yet known the different horizons of the Mary- 

 land and Virginia section contain practically the same fauna, 

 although at some localities and horizons a few forms may 

 appear extremely abundant, while elsewhere, they may be very 

 scarce. It is too early however to speak with much certainty 

 on this point. The fossils, as a rule, are poorly preserved and 

 thus far only the commoner forms have been collected and 

 described. There are traces of many less conspicuous ones 

 that may serve to throw additional light on this subject when 

 their characteristics have been ascertained. 



Below will be found a general section of the Eocene series 

 of the Southern States. It is based to a considerable extent on 

 that given by Smith and Johnson (loc. cit.) though modified to 

 include and harmonize with the writer's more recent observa- 

 tions. The horizon of the Maryland and Virginia Eocene is 

 moreover, indicated. 



