Koninckina Leonhardi. 



a. Translucent specimen. 



b. Interior of the dorsal valve, showing remains of 



the vascular system. 



APPENDIX. 



Page 92, Genus — Koninckina, Suess. 



With Mr. Woodward's permission, I here reproduce two 

 additional figures, drawn from two specimens forming part of 

 Klipstein's Collection, in the British Museum, and published 

 in the 'Manual of the Mollusca,' part ii, p. 231, 1854. 



Much doubt remains still, as to where this curious 

 genus should be located ; Mr. Woodward has placed it in the 

 family Orthid^s:, ? observing that, "this curious little shell 

 most resembles the Triassic Leptcena dubia (producta), 

 Munster (= Crania Murchisoni, Klipst.) !" 



Family — Strophomenid^:. 



Page 105, Strophomena. 



In the 'Natural History of New York,' vol. ii, p. 63, 1852, Mr. J. Hall proposes to distinguish those 

 Strophomenas which possess a denticulated hinge line by the generic appellation of Stropheodonta 

 (Gr. orpofevs, cardo, and ohovs, dens), naming as types &. demissa, Conrad, and S. prisca, Hall. I am 

 not certain that this character can be considered of sufficient importance for the creation of a separate 

 genus : Strophomena euglypha, S. filosa, and many other species admitted into Strophomena, possess 

 denticulations only on those portions of the hinge line near the cardinal process, while the remaining 

 portion is quite smooth. 



Page 103. 



Note 7 must be removed from Orthis, and placed under the Genus Chonetes (p. 113); and for 

 (3d line) "and which I am inclined to believe belonged to a species of Orthis, bearing great resemblance 

 to that form known by the name of 0. resupinata, Martin, sp.," read "and which belong to Chonetes 

 comoides, Sow., sp." 



Obs. Having received from Mr. G. W. Ormerod the loan of several examples similar to (but more perfect 

 than) those in the Society's collection, I at once discovered the mistake I had committed, since they evidently 

 belong to C. comoides, Sow. ; an opinion subsequently corroborated by M. L. de Koninck, Salter, and 

 Woodward. In Appendix, pi. a, fig. 29, I have represented Mr. Ormerod's most complete example of the 

 interior of the ventral valve, wherein the impressions left by the adductor (a) and cardinal muscles (c) are 

 beautifully defined. 1 



Eifel genus, it gives me much pleasure to recognise in our rocks a second species of this remarkable genus" 

 but I fear that the learned professor cannot have made himself perfectly acquainted with the internal 

 characters of this Eifel genus, or he would have perceived that the shell was not totally deprived of appen- 

 dages in either valve, since several examples of U. Gryphus have shown fragments of internal appendages, 

 as represented in pi. vii, fig. 86, c ; although only one has hitherto exhibited to my knowledge traces of 

 the spirals discovered by Professor Beyrich. 



As stated in p. 89 of the ' Introduction,' I feel impressed that the place of Uncites is in the Family 

 Spiriferidte, a view sanctioned and adopted both by M. Suess and Mr. Woodward. 



1 In vol. x of the ' Quarterly Journal of the Geological Society' (p. 202, pi. viii, Dec, 1853), will be 

 found recorded all I have hitherto been able to discover relative to this most interesting species. 



