146 INFERIOR OOLITE AMMONITES. 



young of Haugia Eseri exhibit the characters of the senile stage of Haugia 

 variabilis. 



Haugia variabilis {d'Orhigny). Plate XXV, fig. 2 ; but not Plate XXIII, 



figs. 11 — 15 (see H. jugosa)} 



1844. Ammonites vabiabilis, d'Orhigny. Pal. fran9., Ceph. jurass., pi. cxiii, 



figs. 1 — 4 (not 5, 6). 

 1853. — — Ghapuis et Bewalque. Foss. Luxembourg ; Mem. 



cour. et Mem. des savants etraog., torn, xxv, 

 pi. ix, fig. 2. 

 1856 — — Oppel. Juraformation, p. 250. 



.1867. Hammatocekas vaeiabile, Hyatt. Bulletin Mus. Comp. Zool., No. 5, 



pp. 89, 98. 

 1874. Ammonites variabilis, Dumortier. Etudes pal. Bassin du Rhone, iv, 



p. 77. 

 1878. Hammatocekas Ogeeieni, Bayle (non Dumortier). Explic. carte geol. 



France, pi. Ixxxii, fig. 2. 

 1882. Haepocebas tabiabile, Wright. Lias Amm.; Pal. Soc.,vol. xxxvi,pl. Ixviii, 



pi. Ixvii, figs. 5, 6 ^ (not pi. Ixvii, figs. 

 1, 2, 3, 4). 

 1885. Hammatoceeas ? vaeiabile, Haug. Beitr. Monogr. Harpoceras ; Neues 



Jahrbuch fiir Mineralogie, &c., 



iii Beil.-Bd., p. 656, pi. xi, fig. 13. 



1887. Ammonites (Hammatoceeas) cf. vabiabilis, Denchmann. Fauna ober 



Lias ; Abb. z. geo). Specialkarte 

 Preussen und thiiringisL-hen Staaten, 

 Bd. vii ; Heft 2, pi. v, fig. 3. 



Discoidal, compressed, with large hollow carina. Whorls flattened, with 

 slightly convex sides, ornamented with arcuate ribs directed, in the young, 

 somewhat backwards, and, during the immature stage, springing from knobs 



' The reader is requested to alter the explanation of Plate XXIII, figs. 11 — 15, as follows: — 

 For "variabilis (d'Orbigny) " read ''jugosa (Sowerby)." Erase the whole sentence beginning " But 

 as neither . . . ." Also the explanation of Plate A, fig. 35, should be altered from " variabilis " 

 to "jugosa." 



2 There are discrepancies with regard to the length of aperture and other points between the two 

 figures of this fossil. Mr. G. C. Crick, F.G.S., who has charge of the Cephalopoda in the British Museum, 

 and to whom I am much indebted for invariable courtesy, wrote to me as follows about them : — 

 " The aperture of the original of pi. Ixvii, figs. 5, 6, is scarcely as perfect as one would expect to 

 see, but I consider the length of the aperture to be more correctly represented in tig. 6. The same 

 figure indicates more correctly the distance from bottom of whorl to place of re-entry." 



