Naiad. 



440 



Haw. 



Naiadites { Acanthoptera) carbonaria, Dawson, Acadian 



XKi , II -; Geology, 1868, fig. 31, a specimen in the 



usual flattened and distorted condition in 

 which these shells are found in the bitum- 

 inous shale in the coal measures of the Jog- 

 gins section, so that it is very difficult to find 

 one sufficiently perfect to be described. It is the most abun- 

 dant of any of the shells in the Joggins Coal Measures, beds 

 of some thickness being often almost entirely made up of the 

 valves. (Dawson.) — XII I. 



Natica GarUyana, See Naticopsis carleyana. XI, 



Natica clausa, Sowerby. Dawson's Acadian Geology, 

 48'/ Till ,,£\^'M868, page 74, fig. 18; over 

 boulder clay, St. John. — Geol- 

 ogy of Canada, 1863, page 964, 

 pav^ figure 487. Champlain clay 



{Quaiernary^ or latest glacial) forma' 

 tion.—PP, 



Natica groenlandica, Miiller. Geology of Canada, 1863, 



page 964, fig. 488. (The accompanying 

 figure 489 is of Natica helicoides^ see 

 below.) Cha7nplain clay {latest glacial) 

 C-c ^^^=^ ^ formation. — PI*. 



Natica helicoides, Johnston. Geol. Can. 1863, page 964, 

 fig. 489, for which see under Natica groenlandica,, above. — 

 Champlain clay {latest glacial) formation — PP, 



Naticopsis sequistriata, Meek. Pal. Ohio, Vol. 1, page 216, 

 iim a % j^^ wood-cut fig. a, inagnified XS ; h, back of 



u .li^febv j^^^^ same, strige a little too fine for the scale 



of enlargement. Possibly some European 

 csU:^^^'^^ 1*""^ "^1^ iV^^^icas may be Naticopses ; also some 

 American Silurian IIolopecB of which only casts are found. 

 (Foot note by Meek.) Easily distinguished from the young of 

 Naticopsis levis by its gracefully curved strio3, narrower col- 

 umella, and thin inner lip. (like Platyostoma.) Franklin Co., 

 O. Corniferoits^ VIII a. 



