CTENODONTA. 209 



Genus Ctenodonta, Salter, 1851. 



Tellinomya, Hall, 1847. Nat. Hist. New York, Pal., vol. i, p. 151. 

 Ctenodonta, Salter, 1851. Ecp. Brit. Assoc, for 1851 (1852), Sect. p. 64. 

 Leda, de, Ryckholt, 1853. Mel. Paleontol., partie ii, p. 14G. 

 Ctenodonta, Salter, 1859. Geol. Surv. Canada, dec. 1, p. 34. 



— Murehison, 1851. Siluria, edit. 2, pp. 213 and 546. 



Non — Salter, 1864. Mem. Geol. Surv., Geol. around Oldham, p. 65. 



— — 1866. Mem. Geol. Surv. Gt. Brit., vol. iii, p. 345. 



— pars, Biysby, 1878. Thesaurus Devonico-carboniferus, p. 303. 



— Barrois, 1882. Terr, anciens Asturias et Galice, p. 339. 

 Tellinomya, de Koninch, 1885. Ann. Mus. d'Hist. Nat. Beige, torn, xi, p. 138. 

 Ctenodonta, (Ehlert, 1888. Bull. Soc. Geol. France, ser. 3, vol. xvi, p. 653. 

 Tellinomya, Miller, 1S89. North Amer. Geol. and Pal., p. 514. 

 Ctenodonta, Beusliausen, 1895. Abh. k. Preuss. Geol., Landesanstalt, neue Folge, 



Heft 17, p. 65. 



— Whidborne, 1896. Devonian Fauna, vol. iii, pt. 1, p. 98. 



— Tomquist, 1896. Das fossilfuhrende Untercarbon in den Siid- 



Vogesen, pt. 2, p. 74. 



Generic Characters. — Shell more or less transverse, ovate; surface smooth, or 

 with regular concentric lines. Hinge consists of a long row of teeth, which 

 become smaller as they approach the centre from either extremity; there is no 

 cartilage-pit below the umbo separating the teeth into an anterior and a posterior 

 set. Pallial line entire. 



Observations. — At p. 177 of this Monograph I gave an account of the synonymy 

 of Salter's genus Ctenodonta, showing it to be, without doubt, synonymous with 

 Tellinomya of Hall, which clearly antedates Salter's name. Following (Ehlert, 

 Whidborne, Beushausen, and Tomquist (op. sup. cit.), I have adopted Ctenodonta 

 in preference to Tellinomya, considering the latter name to have been already 

 used for a genus of Lamellibranchs by Brown, who spelt it Tellimya ; but 

 Agassiz in 1846, considering the orthography incorrect, altered it to Tellino- 

 mya. It is satisfactory to be able to discard a name which conveys such a very 

 erroneous idea of the generic affinities of the genus for which it was proposed. 

 Although from external characters alone it is impossible to separate shells of this 

 genus from Nucula ; the hinge is very different, the muscle-scars not so pro- 

 nounced or so low down, and the accessory scars are absent. At present I am 

 able to recognise only one species in Great Britain, but this occurs pretty 

 abundantly at Congleton Edge, Cheshire, with the peculiar fauna to which I 

 have already drawn attention, antea, p. 93. 



De Koninck describes two species from the Carboniferous rocks of Belgium, 

 under the name Tellinomya ; C. sinuosa, de Ryckholt, sp., and C. pusilla. The 



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