256 The Ohio Journal of Science [Vol. XVII, No. 7, 



chiefly in the more acute anterior termination of the muscular 

 platform. Apparently the lateral walls of this platform are 

 more divergent. It is doubtful whether the elevation of the 

 median and lateral muscular scars upon a platform may be 

 regarded as a distinguishing feature, since the growth of this 

 platform may be merely a gerontic feature. 



Lingidops cliftojiensis occurs in the lower or limestone 

 division of the Fernvale member of the Richmond group as 

 exposed at Clifton, Tennessee. For the strata included in the 

 Fernvale member the present writer proposed the name Leipers 

 Creek bed, the term bed being used in the same significance as 

 the term member (Bull. Geol. Soc. Am. Vol. 12, 1901, pp. 432, 

 433). Although the term Leipers Creek bed preceded that of 

 Fernvale in time of publication, the latter was so much better 

 defined by Ulrich and Hayes (Columbia Folio, 1903), and has 

 entered so fully into literature that no possible good can come 

 of any attempt to revive the term Leipers Creek bed. v 



Lingulops cliftoneyisis is of interest chiefly as being another 

 species occurring in Richmond strata, closely allied to species 

 occurring at a lower horizon than the Eden group, but not 

 known either from the Eden or from the Maysville group of 

 strata. 



Schuchertella higginsportensis, Foerste. Plate IX, Figs. 2A, B. 



1912. vStrophomena higginsportensis, Foerste, Bull. Sci. Lab. Denison Univ., 17, 



p. 37, pi. 2, figs. 3 A, B; pi. 10, fig. 4. 

 1914. Strophomena higginsportensis, Foerste, Jour. Cincinnati Soc. Nat. Hist., 



21, p. 130, pi. 1. fig. 9. 



The pedicel valves, illustrated in the publications cited above, are 

 similar to those of Schuchertella subplana, Conrad, widely distributed 

 in the Niagaran rocks of North America, in the small size and general 

 fonn of the muscular area. The deltidium iS' well developed. The 

 exterior of the valve is moderately convex toward the beak, and com- 

 paratively straight from the beak to the anterior and lateral margins. 



More recently, a single brachial valve, exposing the interior, has been 

 found. This also differs distinctly from Strophomena. The cardinal 

 process is short and bilobed. The lobes diverge from each other, and 

 each lobe bears on its ixpper surface a distinct groove, the two grooves 

 converging toward the beak, as in some species of Schuchertella. The 

 margin of the crural plates curves outward laterally, and tenninates 

 in a curve rising toward the cardinal margin. The dental sockets are 

 distinct. There is no evidence of a deltidial fold passing across the top 

 of the cardinal process as in Schuchertella subplana. There may be a 

 low and broad, but indistinct median elevation anterior to the cardinal 

 process, but it is certain that no other structure is noted. 



