86 INFERIOR OOLITE AMMONITES. 



species not having been mentioned as new by any other name. Even Prof. Blake 

 does not give us all the points about this Ammonite, because he commits the too 

 common fault of neglecting to delineate a front view ; but his description 

 makes up, so far as any description can, for the absence of this figure. In 1884 

 Dr. Haug gave two good figures of this species (the front view, however, appears 

 to show the carina less separated from the ventral area than in my specimens), 

 and he also gave a figure of the suture-line, which had not been previously done. 

 It agrees exactly with the one I have depicted for a species of the same genus in 

 Plate A, fig. 22, and shows the four characteristic denticulations between the first 

 auxiliary lobe and the umbilicus. Prof. Blake's figure, which must be considered 

 as the one upon which the species is founded, does not show the umbilicus very 

 clearly, but causes it to appear concave, like that of Lioceras concavum. He also 

 says in his description that " the truncated inner edge is slanting." Dr. Haug, 

 however, says, " Les tours tombent a Tangle droit sur l'ombilic " (p. 350). This 

 statement agrees with my description. 



As a synonym of this species Dr. Haug quotes (with a query) Am. concavus, 

 d'Orb, ' Ceph.,' pi. 116; but Dr. Wright quotes the same reference as a synonym 

 of Pseudolioceras lythense ('Monogr. Lias. Am.,' p. 444). D'Orbigny's figure evi- 

 dently belongs to the genus Pseudolioceras, and, as Dr. Wright has well shown, 

 has nothing to do with Lioc. concavum (Sowerby). It is most probable that the 

 form represented by d'Orbigny's figure belongs no more to Ps. lythense than to 

 Ps. contractile, but must be added to the same genus as a species which presents 

 quite as much difference from its fellows as they do from one another. 



Pseudolioceras compactile occurs in certain rock-bands rather low down in the 

 " Cotteswold Sands." 1 I should prefer to consider these strata as Liassic, and 

 therefore it may be thought that this species occurs in beds outside the limits of 

 my Monograph. But authors are not unanimous in considering these strata as 

 Liassic ; 2 and since Dr. Wright has omitted to figure this species in his ' Mono- 

 graph on Lias Ammonites,' I hope to be excused for inserting it here. It forms a 

 very good introduction to the next species, and to the succeeding genus Hyper- 

 lioceras, which is in fact its direct descendant. 



I have obtained this species from the following localities in Gloucestershire : — 

 Coaley Wood (Section VI, Bed 17) and Nibley Knoll (Section VII, Bed 30) ; also 

 Stinchcombe in the Striatulum-beds. It is rather scarce. The small specimen 

 mentioned as having been obtained at the bottom of the Cotteswold Sands at 

 Stinchcombe (Section VIII, Bed 2) might perhaps be more correctly assigned to 

 Pseudolioceras lythense than to this species. Prof. Blake (p. 309) quotes the species 

 from Yorkshire as from the " zone of A. jurensis at the Peak, where it is not 



1 Only recently have I found this species also in the Striatulum-heAs, which overlie the Cotteswold 

 Sands. 2 See p. 50. 



