W. S. M. — Notes and Queries on English Stmta. 113 



which, is observed in 0. conica, a point of generic distinction, — that 

 structure being wanting in both 0. minor and the Carboniferous 

 form. 



This species, for which I would propose the name Ortonia car- 

 bonaria, may be briefly described as follows. — Tube circular, coni- 

 cal, calcareous in structure, solitary; generally found attached by 

 their whole length to the spines of Prodiictce, straight, or slightly 

 curved, or flexuous. Ornamented with sharp annulations or trans- 

 verse ridges, the interspaces being rather wider than the ridges. 

 Marked longitudinally with microscopic striae. Length |- to |- inch ; 

 diameter of tube at mouth -J.^ to gL inch; 35 annulations in ^ inch. 



This species I have found to be somewhat rare when searching 

 our Limestone shales for Foraminifera and Entomostraca. It occurs 

 in both the Lower and Upper Limestone series at several localities 

 near Glasgow ; but I have found it most numerous in the Lower 

 Limestone shales at Brockley, near Lesmahagow. The great majority 

 of the specimens are, or show that they have been, attached to the 

 slender spines of Productce, sometimes two or more being found 

 upon a fragment of the same spine, but more often occurring singly. 



The enlarged figure of Ortonia minor, PI. IV., Fig. 2a, fairly 

 represents the external form of the Carboniferous species, as seen 

 in many of the specimens, and might serve for an illustration, if 

 we excepted the more minute markings which distinguish it from 

 the Silurian form. 



VII. — Notes and Queries on the Classification and Nomen- 



CLATUKE OF THE ENGLISH StKATA. 

 (Communicated by W. S. M.) 

 Ahhreviations. — A. a. — Kecognized as a separate formation with defi- 

 nite limits, by 

 b. — In the year 

 c. — Where published 

 d. — Under the name 

 e. — Origin of name 

 B, — Changes on previous grouping or name 

 C. — Subsequent changes 



Chalk. A. (a) William Smith. (&) 1799. (c) In his first table. 

 (d) Chalk, (e) Adopted general name. 



B. None. 



C. In 1816 he divided it into Upper and Lower. 



Con. and Phil, in 1822 divided into "with flints," "with 

 few flints," " without flints," and recognized the underlying 

 " Grey Chalk," which they state might more properly be 

 designated "Chalk Marie." The term Chloritic Marl (a 

 division underlying the Chalk Marl) originated in 



Uppek Gkeensand. a. (a) Fitton. (b) 1824. (c) An. Phil., vol. 

 viii. p. 365. {d) Firestone, (e) Adopted the local Isle of 

 Wight name. [Query — Only I. of W. ? ] 



TOL. X. — NO. CY. 8 



