clxxxii 



INFERIOR OOLITE AMMONITES. 



26. Dumoetieeia Mooeei {Lycett), Wright. Plate XLIV, fig. 9. Fig. 179 in text. 



1857. Ammonites Moorei, Lijcett, Cotteswold Hills, p. 122, description partly, 



and dimensions (PL i, fig. 2 a ?). 

 1883. Harpoceras aalense, Wright (non Zieten), Lias A mm. (Pal. Soc), PI. 



lxxx, figs. 1, 2. 



'Remarks.- — The evidence about the type-specimen and Wright's figure is given 

 in p. 255. One piece of evidence about the Jermyn Street example has been over- 

 looked. Lycett in the explanation of his plate speaks of his figured example as a 

 " small specimen. " This is against the Jermyn Street fossil being the type. But 



Lycett's figure looks like an adult specimen, 

 reduced, and Wright says : " the large shell 

 which . . . Dr. Lycett figured in his hand- 

 book " (p. 459). 



Under the circumstances it is best to take 

 Wright's figure as representing the type. That 

 agrees so closely with the specimen referred to 

 by Lycett as the largest example — of which 

 he gives dimensions (p. 122); it is probably a 

 figure of the same shell, which is most likely 

 the Jermyn Street specimen, and that has 

 always been considered as Lycett's type. 



I have given a figure of another example 

 here for two reasons — to illustrate the species 

 better, and to emphasize the remarkable de- 

 ceptions of homceomorphy. This figure 

 should be compared with that of Cottesivohlia bifax, p. cxxxvi, and the difference in 

 the radial line noted. The two fossils are in the same stage of decline — from 

 costate to striate — and show about the same amount of costate umbilicus; in fact, 

 they are in every way most similar. Such differences as they present might be 

 regarded as individual variation were it not for the differences in radial line, which 

 differences they share with their respective allies. 



This is a good example of the trouble in Ammonite identification. 



27. Dumoetieeia subexcenteica, 8. BucJcmav. Plate XXX, fig. 19, Plate XLIV, 



figs. 7, 8. Suppl., Fig. 180, p. cxcvi. 

 cf. 1851. Ammonites opalinus, Bayle and Coquand (see p. 255). 



1890. Dumortieria Moohei, This Monogr., PI. xxx, fig. 19; 1891, PI. xliv, figs. 



7, 8, p. 255 (pars). 

 1902. — subexcentrica, Emend. Amm. Nom., p. 6. 



1 Two pieces of body-chamber, making another half-whorl, belong to this specimen, but C. bifax 

 is complete. 



Fn.i. 17i». Ihimorlicrld Mi 



