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AUG. F. FOERSTE 
valves with each other; both the spondylia and cruralia are 
short, the former being supported on a high median septum 
and the latter being sessile along the median line on bottom of 
the interior of the valve. The exterior of the pedicel valve 
shows no tendency toward a median depression or groove. The 
genus is regarded as related most nearly to Pentamerella, a Devonian 
genus. In Pentamerella the shell is short, deep, and galeatiform, 
the spondylium is not supported by a long septum, there is a 
tendency toward a narrow sinus on the exterior of the pedicel 
valve, the delthyrium is exposed, there is a pseudo-cardinal 
area, and the anterior septal extensions of the crural plates 
unite at the base so as to form a cruralium resting on the inner 
surface of the brachial valve. 
PLATE XXI 
Fig. 1. Strophomena cf. incurvata. Pedicel valve. Locality 3 on Sanders 
branch, in Kimmswick limestone. 
Figs. 2, 3. Rafinesquina deltoidea. Pedicel valves. Locality 4 on Sanders 
branch, in Kimmswick limestone. 
Fig. 4. Parastrophia hemiplicata var. Pedicel valve. Locality 4 on Sanders 
branch, in Kimmswick limestone. 
Fig. 5. Platystrophia shepardi. Brachial valve. Locality 3 on Sanders 
branch, in Kimmswick limestone. 
Fig. 6. Holopea cf. parvula. From Conn’s Ford, at top of Plattin limestone. 
Fig. 7. Holopea concinnula. From Conn’s Ford, at top of Plattin limestone. 
Fig. 8. Hormotoma gracilis angustata. From Conn’s Ford, at top of Plattin 
limestone. 
Fig. 9. Conularia sp. Enrolled fragments. From city quarry, 1 mile south- 
east of New London, near top of Plattin limestone. 
Fig. 10. Hyolithes baconi. A, convex side of fragment, with lower end 
restored; from Buford cave. B, flattened side of second specimen, from J. H. 
Smith farm. Both from top of Plattin limestone. 
Fig. 11. Hyolithes baconi. Convex side. From Buford Cave, at top of 
Plattin limestone. 
Fig. 12. Conularia plattinensis. Fragment apparently exposing almost all of 
one face. From Conn’s Ford, at top of Plattin limestone. 
Fig. 13. Ctenodonta sp. (gibberula group). Left valve. From 1 mile north- 
west of Spalding Springs, near home of H. W. Ogle, at top of Plattin limestone. 
Fig. 14. Parallelodus obliquus. Right valve. From Conn’s Ford, at top of 
Plattin limestone. 
Fig. 15. Bumastus holei. A, cranidium; B, pygidium. From locality 3 on 
Sanders branch, in Kimmswick limestone. 
