TIIK NAUTILUS. 131 



Fig. 6. Hyria corrugata Lam. Specimen from Rio Tapajos, San- 

 tarem, Brazil. 



Fig. 7. Tetraplodon undosus (v. Mart.). Specimen from Rio Tield, 

 Itapura, Brazil. 



Plate VII. 



Horizontal cross-sections through the gills of Naiades. All sections 

 from sterile females. In all figures, i ----- inner gill, e = outer gill. 

 Photographs taken with B. & L. 1-iii. objective. 



Fig. 1. Quadrula pustulosa (Lea). Specimen from Lake Erie, Cedar 

 Point, Erie Co., O. 



Fig. 2. UN io gibbosus Barn. 



Fig. 3. Parreysia wynegungaensis (Lea). 



Fig. 4. Lamellidens consobrinus (Lea). 



Fig. 5. Spatha kamerunensis Walk. 



Fig. 6. Hyria corrugata Lam. 



Fig. 7. Tetraplodon hasemani nov. 



(Specimens of Figs. 2,3,5,6, 7 from same localities as on Plate VI; 

 specimen of Fig. 4 from India.) 



NOTES ON SOME PLIOCENE FOSSILS FROM GEORGIA WITH DESCRIP- 

 TIONS OF NEW SPECIES. 



BY T. 11. ALDRICH. 



Some years since Prof. S. "W. McCallie, State Geologist of 

 Georgia, called my attention to a small block of soft marl in the 

 State Museum which had a number of shells in it, and at my solicita- 

 tion the same was kindly forwarded to me for examination. I found 

 the specimens were a mixture of fresh water and marine, and that 

 the fresh water ones seemed to be new besides being more or less 

 distorted. The specimens were very fragile; notwithstanding the 

 greatest care many of the most distorted were badly broken. It is 

 hoped that a future examination will reveal more species and an as- 

 sortment of forms far greater than th )se here described. The hori- 

 zon is probably Pliocene, and seems to represent a southern fauna. 

 The exact locality is four miles south of Atkinson, Wayne Co., Ga., 

 on the Saltilla River. The list of species is as follows : 



1. Rangia cuneata Gray. (Common, rather small.) 



2. Mub'nea lateralis Say. 



3. Mulinea congesta Con. 



4. Dosinia sp ? (Young shells.) 



5. Modiolaria sp ? 



6. Gemma purpurea H. C. Lea. 



7. Neritina sp ? (Too poor for identification.) 



8. Neverita sp ? (Fragments.) 



