B. ETHEEIDGE, JTTN., ON LOWEE-CAEBONIEEEOUS ENTEETEBEATA . 19 



Genus Mtjechtsonia, D'Archiac & De Verneuil. 



Murehisonia, D'Archiac & De Verneuil, 1841, Bull. Soc. Geol. 

 de Prance, xii. p. 159. 



Muechtsonia STEIATUXA, De Koninck ?. PL II. fig. 29. 



Murchisonia striatula, De Kon. Descr. Anim. Foss. Terr. Carb. 

 Belgique, 1844, p. 415, t. 40. fig. 7. 



Ohs. Our little shell approaches nearer to Prof. De Koninck's 

 description than to any other I can find. Unless the Woodhall 

 shells are young examples of M. striatula, the difference in size is 

 very marked ; and, further, the ornamentation does not quite coincide 

 with that of Prof. De Koninck's species. So far as I have been able 

 to discriminate them, the ridges and grooves are less than twelve in 

 number ; and the former are separated by more equal spaces than 

 the grooves of M. striatula appear to be. The whorls vary in num- 

 ber ; Mr. Henderson's specimens possess eight, whilst in the Survey 

 Collection there is one from the same locality, collected by Mr. 

 Bennie, with eleven whorls. Loxonema polygyra, M'Coy*, is nearer 

 to the present shells in point of size, but is marked with much too 

 few concentric ridges. 



Loc. and Horizon. In the shale with marine fossils at Woodhall. 

 as before. 



Genus Belleeophon, De Montfort. 



Belleeophon decussatus, Fleming, var. undatus, R, Eth., Jun. 

 PL II. fig. 30. 



I described this variety in the ' Geological Magazine ' for April 

 (1876)f . It differs from the typical form in having a series of broad 

 obtuse fluctuations or waves in the direction of the transverse striae. 

 The latter are clearly visible in young specimens ; but in older and 

 larger individuals they become obscured or obsolete, or nearly so. 



Loc. and Horizon. Woodhall, as before. 



Class PTEROPODA. 



Genus Conulaeia, Miller. 

 Conularia (Miller), Sowerby, Mineral Conchology, iii. p. 107. 



Conulaeia sp. ind. 



Ohs. One fragment only has come under my observation in Mr. 

 Henderson's collection ; but in the Geological Survey Cabinet there 

 are two others which, although only portions also, afford more in- 

 formation than the other. The specimens represent a part of one 

 of the faces of the pyramid with its median ridge. The transverse 



* Synop. Carb. Foss. Ireland, 1844, p. 30, t. iii. fig. 1. 

 t Decade 2, vol. iii. p. 155, t. vi. figs. 9, 10. 



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