86 THE EOCENE DEPOSITS OF MABTLAXIj 



In the above table and in the following discnssion only the moUnsca 

 and corals are inelnded- Many of the other species occnr outside of the 

 state, bnt they are not considered here becanse the facts at hand are not 

 complete enough to base upon them any generalizations concerning the 

 distribution of the forms or any deductions concerning their significance. 



Aquia Stage. — ^The Aquia stage includes the following species that 

 hare been found in the Lower Chickasawan of the Gulf, several of 

 which- as will be seen by the table, also range downward into the Mid- 

 wayan. while others pass upward into the Upper Chickasawan and even 

 into the Claibomian. Some of these forms also, as will be further seen 

 from an esamination of the table, are not confined alone to the Aquia, 

 but range on into the Xanjemoy stage. The following Lower Chick- 

 asawan species are found in the Aquia: 



Tornaienaea hetta Conrad. '^?j Odoitoraia trapaquard^ rEarris.i. 



Pltarotoma ehUdrerd Lea, Cadulus abrvptui Meyer and Aldrich. 



Caneenaria graeHoidei Aldrich. CorbvAa gytjengoTuita Dall. 



VrA'xtiJUftei petrfMsws (Conrad >. Corbvla aJdriehi Meyer. 



CarieeUa pymloid/m (Conradj. J/eref rijc ovai^i Conrad. 



Fituws KuhtenvM Heilprin. UoKinioptin lentxeularvi (Eogers). 



Trophon iuhlecii Harris. Lvuciroi aqumna Clark. 



Chryj^jdoravf engofiatui ^Heilprin). Petten johnjsoni Cl&rk. 



Fiusoficala jvivtni$ '^ Whitfield). Oistrea comprevArotUra Say. 



Morio bre>kdeniala (Aldrich). Glyeyrneris Honeu* 'Conrad . 



Cahjptraphoru* trinodiferug Conrad. CwraUaea gigantea Conrad. 



TurriieUa rfujrtoni Conrad. Leda parva (Eog^ers.i. 



Turritena humerosa Conrad. Xveula ovula Lea. 



Lunatin m/jrylandica Conrad. BalanopTigllia desmophylivm M-E. and H. 



Calyptraea oiperta (Solan der). Enpssauiraia daborata (Conradt. 



Xiso umbUieata (Lea.). 



Of these forms a few only are restricted to the Lower Chickasawan, 

 the remainder ranging on into the Upper Chickasawan and some on into 

 the Claibomian as welL The restricted forms are: 



Tropfion sublecig Harris. Lueiua aquiana Clark. 



Morlo hrevidentata (Aldrich). CvcuUaea gigantea Conrad. 



Jjoiiniopfit fentindariA (Kogers). 



All of these species, except Cucullaea gigantea, are confined to the 

 Aquia stage. 



I See the discnssion of this form in the chapter on Systematic Paleontology, p. 156. 



