707 



Pleu. 



gradual spire, centrally angular whorls, and long regular cone 

 form. — Spergen Hill, etc., end. — Like Murchisonia insculpta^ 

 Subcarhomferous. — XI, 



Pleurotomaria coronata^ near P. wortheni. — XI. 



Pleurotomaria cyclostoma, Whiteaves. Pal Foss. Can- 



/>/./// 



p, cLurhajnCfss 



Wit^ 



ada, 111, i, 1884, page 23, plate 3, fig. 12, side view of a speci- 

 men from Durham, Canada West ; 12 ^, another showing mouth ; 

 crowded transverse striae ; shell extremely thickened at the 

 periphery of the last volute, so as to make an exactly circular 

 mouth ; a curious feature seen also in Pterocheilus primus^ 

 Moore, from English Lias, Differs from P. hispiralis^ Hall, 

 in more obliquely flattened spire, etc. — Guelph formation. Vb\ 

 Pleurotomaria depressa, Cox. (The name depressa was 

 '7/7.^i^Xif/U' jgtt^ used twice before Cox described this 



species, which must therefore be re- 

 named). Geol. Sur. Ky., Vol. 3, 1857, 

 (:c "'^s^C-'Cc/i.Kv.m.""^ .\ page 569, plate 8, fig. 10, enlarged; 

 10 a^ natural size. Common in the rock shale of No. 11 coal, 

 at Bonharbour and Airdrie, Kentucky. Upper coal measures, 

 XV, — See P. modesta below, 

 P. disjuncta, Hall, Pal. N. Y. Vol. 5, ii.— Till c, 

 P. dispersa, Dawson, Acad. Geol. 310. — XIII? 

 Pleurotomaria docens, Billings. Geology of Canada, 1863 



pagel32,fig. 

 63 a^ view ot 

 the spiral ; 

 63 6, side 

 view; 63 <?, 

 part of the 

 band magni- 



Hed, Chazy 

 limestone. II h. 



63.^ 



