350 PROCEEDINGS OF THE NATIONAL MUSEUM, vol.45. 



Dalmanella lunata (Sowerby). 



Fig. 1. — A pedicle valve drawn from rubber mold of the exterior. 



Locality: Head of Leigh ton Cove, Pembroke Peninsula, Washington County, 

 Maine (loc. No. 5.3.8M3). 



Cat. No. 58957. 



Fig. 2.— A small specimen of pedicle valve (?young), a natural mold of the interior. 



Locality: Leighton Cove, higher up in section than figure 1 (loc. No. 5.3.8F). 



Cat. No. 58958. 



Fig. 3. — A pedicle valve of the wider form, taken from a wax mold of the exterior. 



Locality: Same as figure 1. 



Cat. No. 58957. 



Fig. 4. — A small brachial valve (?young), showing the narrow form of Orthis 

 elegantula Dalman. 



Locality: Same as figure 2. 



Cat. No. 58958. 



Fig. 5. — A brachial valve, drawn from a wax mold of the exterior, showing the 

 characteristic surface sculpture. 



Locality: Same as figure 1. 



Cat. No. 58957. 



Fig. 8. — A pedicle valve of the wide variety. 



Locality: Leighton Cove, a few feet higher in the section than figure 1 (loc. No. 



5.3.8.M1). 



Cat. No. 58959. 



Chonetes bastini Williams. 



Fig. 6. — Exterior of a pedicle valve. 



Locality: Leighton Cove, Pembroke Township (loc. No. 5.3.8F). 



Cat. No. 58960. 



Fig. 7. — Exterior of a pedicle valve showing a median furrow. 



Locality: Leighton Cove (loc. No. 5.3.8.M3). 



Cat. No. 58961. 



Fig. 10. — A slab showing several specimens natural size, showing both the variation 

 in form and the very fine radial lines. The specimen in the left upper corner resembles 

 C. striatella and the specimen on the right lower corner C. nova scoticus. 



Locality: Same as figure 7. 



Cat. No. 58961. 



Camarotoechia leightoni Williams. 



Fig. 9. — A brachial valve showing the median septum, and the concentric imbrica- 

 tions not showing till near the front. 



Locality: Leighton Cove (loc. No. 5.3.8M'). 



Cat. No. 58962. 



Fig. 11. — A pedicle valve, showing the concentric imbrications beginning suddenly 

 at about mid growth, the sinus with three well defined plications. 



Locality: Same as figure 9. 



Cat. No. 58962. 



Fig. 12. — A pedicle valve showing widening of the sinus toward front and beginning 

 of division of the plications bounding the sinus. 



Locality: Same as figure 9. 



Cat. No. 58962. 



Fig. 13. — Front view of specimen showing both valves. The specimen is com- 

 pressed from front to back, making it to appear more gibbous than natural. 



Locality: Leighton Cove, a few feet below locality of figure 9 (loc. No. 5.3.8M^). 



Cat. No. 58963. 



