lxx INFERIOR OOLITE AMMONITES. 



2. Ludwigia Haugi, Douville. SuppL, Plate XIV, figs. 8—10. 



1884. Ludwigia Haugi, Douville, Zone Am. Sowerbyi ; Bull. Soc. geol. France, 



3e eerie, vol. xiii, p. 26. 



1885. — — Haug, Beitriige Monogr. Harpoceras ; Neues Jahrbuch 



fur Mineral., &c, Beil.-Bd. iii, pi. xii, fig. 9 

 (type-figure). 



Description. — Subplaty-subpachygyral, sublatumbilicate, subbullati-costate. 



Remarks. — Douville proposed the name Ludwigia Haugi as a specific designa- 

 tion for Ammonites Murchisonse obtusus ; but, in the first place, in using the restricted 

 genus Ludwigia instead of Ammonites there was no need to give a name other than 

 obtitsus. However, under the name Am. Murchisonse obtusus, palaeontologists had 

 been accustomed to group several different forms ; so that fixing Quenstedt's name 

 obtusus on his original figure, it is possible to keep Douville's name Haugiiov one 

 of the others. As to which it shall be there need be no doubt, for in the following- 

 year (1885) Haug gave a figure under the name Ludivigia Haugi; and as this is the 

 first figure given under this name, and as it is certainly one of the forms which 

 would have been called " Am. Murchisonse obtusus^ and as Haug was well qualified to 

 interpret Douville in this matter, it may be taken as the type-figure of the present 

 species. The specimen now depicted agrees with Hang's figure in proportions ; 

 but it has not quite such a rursicostate character of the outer portion of the ribs. 

 It almost seems as if this character had been somewhat exaggerated in his figure. 



Distinction. — From L. tuberculata, less ornament. 



Localities and Strata. — Bradford Abbas, in the Paving Bed. Foreign : 

 Normandy (Calvados), " May-sur-Orne, Murchisonse [beds] " (Dr. L. Brasil). 



Date of Existence. — Murchisonse hemera. 



3. Ludwigia MurohisoNjE (J. de G. Sowerby). Plate II, figs. 1, 2. 5 ; Plate III, 



figs. 1,2; Plate A, fig. 8; SuppL, 

 fig. 26. 



182U. Ammonites Murciiison^;, /. de C. Sowerby, Min. Conch., pi. dl. 

 1887. Lubwigia Muechisonje, This Monogr., PI. ii, figs. 1, 2, 5 ; PL iii, figs. 1, 2 



PI. a, fig. 8. 



Description. — Platy-subleptogyral, gradunibilicate ; costate declining to striate. 



Distinction. — From L. Haugi, rather thinner ; less strongly costate ; and in the 

 adult the regular costaa fail about half a whorl earlier. 



Localities and, Strata. — Isle of Skye : Holme, near Portree, in " Micaceous 

 sandstone" (Sowerby's original). 1 Dorset : Bradford Abbas, in the Paving Bed. 



Date of Existence. — Murchisonse hemera. 



1 " Coast of Trotteruisli, near islet of Holm," J. W. Judd, Sec. Rocks; 'Quart. Journ. Geol. 

 Soc, vol. xxxiv, p. 720. 



