xvih INFERIOR OOLITE AMMONITES. 



such a notice cannot be held to give a name to a species, and is of no value in 

 the matter of priority. 



Meneghini 1 considered Oppel's iserensis to be the same as Hauer's erbaensis. 

 He supposed that Oppel did not know, or pretended not to know, of Hauer's 

 almost contemporary work ; but considering that both works appeared in the 

 same year, and that publication is often long after preparation, the idea of 

 pretence is scarcely warranted. Meneghini placed erbaensis as a synonym of 

 comensis, though he recognised it as a jDerfectly distinct form ; in fact, he 

 separated comensis into as many as nine distinct types. 



Haug regarded iserensis as a synonym of erbaensis. 



Bonarelli, however, has definitely separated iserensis, and has placed as 

 syuonyms erbaensis and tirolensis, Dum. (non Hauer), and comensis, Meneghini, 

 pi. vi, figs, l, 2. 



It is very probable that Oppel had more than one species in view when he 

 gave his description. Considering that Dumortier's erbaensis and tirolensis both 

 come from the locality noted by Oppel for iserensis, and that they are both 

 distinctly different forms from what Hauer described by these names, the 

 chances certainly are that one, if not both of them, were regarded by Oppel as 

 iserensis. Therefore Bonarelli is perfectly right in considering Oppel's iserensis 

 as " a form quite distinct " from Hauer's erba.ensis. Still Bouarelli gives iserensis 

 too wide an application. From the series I select as the type of iserensis the 

 Am. erbaensis, Dumortier, non Hauer (see p. xvii). 



The fragment figured in Suppl., PI. II, fig. 1, agrees with the outer whorl 

 of Dumortier's erbaensis, but it is not sufficient to found a species upon. For 

 that reason the present figure is not taken as the type. If future examples show 

 that it is distinct from Dumortier's fossil, then it will require a new name. 



Locality and Stratum. — Northamptonshire : Moulton, in the Upper Leila-ovum 

 beds. Found by Mr. B. Thompson, F G.S. 



Haug 2 says that erbaensis belongs to the jarense-zone ; but Meneghini 3 says 

 that comensis (including iserensis, erbaensis, &c.) occurs with Am. bifrons in the 

 red Ammonitiferous limestone of the Central Apennines, &c. 



Date of Existence. — Lilli hemera. 



1 ' Monogr. Lias sup. Lombarde ; ' Pal. Lombardie, series -1, p. 22, 1867. 



2 Op. cit., p. 634. 



3 Op. cit., p. 30. 



