20 



CARBONTCOLA, ANTHRACOMYA, AND NAIADITES. 



describes." Mr. Strickland then points out the difference in the characters of the 

 Coal-measure shells from those of Gardinia, and contends for a fresh-water habitat 

 for the former. 



1844. In the same year Dr. Garner gave some drawings in the ' Natural 

 History of the County of Stafford,' pi. B, of Coal-measure shells from the North 

 Staffordshire coal-field ; but he neither named nor described them. Figs. 21, 22, 

 appear to be Naiadites modiolaris ; fig. 19, Naiadites carinata ; figs. 20 and 23, 

 three forms of Carbonicola. 



1845. In 1845 Murchison, von Keyserling, and de Verneuil ('Russia and the 

 Ural Mountains,' pi. xxi, fig. 9), and de Verneuil (' Paleontologie de la Russie,' 

 pi. xix, fig. 10), described and figured JJnio Eichivaldianns as a Coal-measure form, 

 closely allied to JJnio subconstrictus, Sow., and JJnio uniformis, Goldfuss, shells 

 which probably belong to two different genera. 



In 1846 von Keyserling, in ' Petschoraland,' &c, described Gardinia sub- 

 par allela from Coal-measures. 



1850. In a memoir with the title of 'Melanges paleontologiques,' part 1, 

 published in 1850, P. de Ryckholt described and figured — 



Cardinia atrata, Groldfuss (not figured), 



Hullosiana, Kyckh., 



colliculus, Rbyck., 



nucularis, 



Toillieziana, Byckh., 

 *lians, 



uncinata 

 *Omaliusianus, 

 *ampetilicola, 

 *cordolianus, 



angulata, 



Cardinia Scherpenzeeliana, Ryckh., 

 salebrosa, Ryckh., 

 niacillenta, Ryckli., 

 Mytilus prsspes, 



Wesemzelianus, 



Toillieziana, 



Font enoy anus, 



ligonula, 



fabalis, 



Geinitzianus, 



divisus, 



mostly from the neighbourhood of Mons, Liege, and Tournay ; but those marked 

 thus * were from Vise. Most of the forms described as Mytilus are young examples 

 of Naiadites, but I think it possible that Posidonomya Gibsoni is included 

 amongst them. 



I have been to the Museums of Brussels and Liege, but have not been able 

 to find the original specimens, although Professor Dewalque showed me many in 

 his own collection named after Ryckholt ; and at the former place there are 

 also specimens with his name attached. It is highly probable that many of the 

 forms named above are synonymous, and denote different stages of growth of 

 the same shell. The name Mytilus prsepes is given to Anthracomya Williamsoni 

 (Bronn) at Brussels. With regard to those shells described as Gardinia, all 

 the forms figured belong to Anthracomya, except C. Hulloziana, which is a 

 Carbonicola. These Anthracomyse are much embellished in the drawings, and 



