CHONETES. 189 



think, however, that my Belgian friend is not quite correct while uniting Chonetea 

 crassistria to C. gibber nl a and sulcata, for reasons already stated. 



c. — Chonetes (Ort/iis) sulcata, M'Coy. Synopsis of the Characters of the Carb. Foss. 

 of Ireland, pi. xx, fig. 6 (fig. 20 of my plate). 



" Semicircular, gibbous ; ears flattened ; surface with very coarse, rounded, frequently 

 branched striae ; hinge-line exceeding the width of the shell, furnished with ten strong, 

 conical spines." (M'Coy, p. 126.) 



Loc. Arenaceous shale, Bruckless, Dunkineely. 



Having had the advantage of being able to examine the original specimen in Sir 

 R. Griffith's collection, I could not distinguish it from many specimens of C. Hardrcnsis. 

 The figure in the 'Synopsis' is not quite correctly drawn ; that in my plate was taken 

 from the type. 



d. — Chonetes; (Lejjfcena) volva, M'Coy. Synopsis of the Characters of the Carb. Foss. 

 of Ireland, pi. xviii, fig. 14 (fig. 21 of my plate). 



" Semicircular, gibbous ; ears involute, separated from the body of the shell by a 

 shallow depression ; hinge-line twice the length of the shell ; furnished with twenty-four 

 slender, hooked spines ; surface covered with fine, flexuous striae. Length eight lines, 

 width one inch four lines." (M'Coy, p. 121.) 



Loc. Lower limestone, Millecent, Clare, &c. 



Obs. Through the kindness of Sir R. Griffith I have been enabled to examine the 

 type and several other examples of this so-termed species, and I must confess that, 

 although I am not quite prepared to positively assert that C. volva is a synonym of 

 C. Hardrcnsis, I must observe that many of the specimens could not be distinguished from 

 the last-named shell. The stria? are not simple, but arranged exactly as in C. Hardrensis, 

 of which it is very possibly nothing more than a variety. In his * Monographic/ Prof, de 

 Koninck has placed C. volva among the synonyms of his C. Dahnaniana, to which he has 

 added also C. multidentatd. This last belongs to C. papilionacea ; but I am convinced that, 

 had my learned friend been able to study the original types of several of M'Coy's so-termed 

 species of Chonetes, he would have arrived at different conclusions. 



e. — Chonetes {Leptoena) perlata, M'Coy. Synopsis of the Characters of the Carb. Foss. 

 of Ireland, pi. xx, fig. 9 (fig. 25 of my plate). 



" Semicircular, nearly twice as wide as long, convex ; front margin nearly straight ; 

 surface marked with very fine, longitudinal, slightly flexuous striae ; hinge-line with about 

 eight long, slender spines, set nearly at right angles ; length three lines, width five and a 

 half lines." (M'Coy, p. 120.) 



