EOCENE TEREBRATULA 
27 
basal member of the formation contains T. marylandica along 
with a great many other forms. At the locality where the collec¬ 
tion was made the following species were recognized. The hori¬ 
zon is about 100 feet above the base of the Aquia section. It is 
recalled that the Aquia beds do not represent the earliest American 
Eocene sediments, but a section somewhat younger than the oldest 
Eocene layers of the Southern states. 
Pelecypoda: 
Crassatellites alaeformis, Conrad. 
Cuculaea gigantea, Conrad. 
Dosiniopsis lenticularis, Rogers. 
Leda cliftonensis, Clark. 
Meretrix ovato, var., pyga, Conrad. 
Meretrix subimpressa, Conrad. 
Ostrea compressirostra. 
Protocaria lenis, Conrad. 
Teredo virginiana, Clark. 
Venericardia planicosta, var. regia, Conrad. 
Gastropoda: 
Lunatia marylandica, Conrad. 
Turritella mortoni, Conrad. 
Volutilithes petrosus, Conrad. 
Brachiopoda: 
Terebratula marylandica. 
The foregoing fossils are imbedded in a matrix of greensand, 
and like the shells of T. marylandica show no evidences of trans¬ 
portation, but all are true representatives of early Eocene time. 
Some other forms of the T. marylandica are found in the collec¬ 
tion of the Johns Hopkins University, that were obtained near 
the mouth of the Severn River, opposite the Naval Academy. 
These forms although much broken have the internal platforms 
well preserved. With the Terebratula of this locality there are a 
number of characteristic Aquia fossils, some of which occur 
abundantly at Leeland. 
Explanation of Plate in 
Fig. 1. Lateral profile of the two species. 
Fig. 2, Dorsal profile of same. 
Fig. 3. Cross-section of the two in the region of maximum thickness. 
Fig. 4. Cross-section of the two half way between region shown in 
Fig. 3 and anterior margin. 
Fig. 5. Cross-sections of the two at the positions indicated, showing the 
platform; T. harlafti on left, and T. marylandica on right. 
