90 
AUG. F. FOERSTE 
The muscular scar in the interior of the pedicel valve is about 
15 mm. long and 12 mm. broad. Its postero-lateral margins 
diverge at an angle of 80°. Along the anterior half of the scar 
the lateral margins are approximately parallel or converge but 
moderately. The lateral thirds of the anterior margin are dis- 
tinctly limited, but the median third is at the level of the general 
surface of the interior of the valve. The lateral margins rise for 
a height of 0.5 mm. The adductor scars extend 12 mm. anterior 
to the beak, the antero-lateral parts of the muscular area extend- 
ing 3 mm. farther. The total space between the valves of the 
complete shell at its geniculation is scarcely 5 mm. 
Locality and formation.^ — Quarry ^ mile northeast of Center- 
ville, Ohio; in the upper part of the Brassfield limestone. Com- 
mon. 
Remarks.- — Forms similar to those of typical Leptaena rhom- 
hoidalis are not uncommon in Brassfield strata, but the form 
here described is much larger, more elongate, and less abruptly 
geniculate anteriorly. The body of the pedicel valve is more 
convex, and the anterior wrinkle is not abruptly limited pos- 
teriorly. 
Strophonella hanoverensis (Foerste) 
Strophomena hanoverensis Foerste, Proc. Boston Soc. Nat. 
Hist., 24, 1890, p. 301, pi. 6, fig. 1. 
Strophomena (Orthothetes) hanoverensis Foerste, Geol. Surv. 
Ohio, 7, 1895, p. 567, pi. 27, fig. 34; pi. 31, fig. 1. 
In the original description of this species it is stated that the 
ventral valve is convex, but that the part near the beak is 
flattened or even contains a very slight median depression of 
very short length. This depression is indicated by the upper 
part of the outline accompanying the figure of this supposed 
ventral valve. This outline is repeated in volume 7 of the Geo- 
logical survey of Ohio, cited above. It is evident from this 
description and figure that the supposed ventral valve is in 
reality the brachial valve, and that the species is a true Stro- 
phonella. 
