194 INFERIOR OOLITE AMMONITES. 



says, *' Die Zieten'sche Abbildung vom Amm. Aalensis stellt den schwabischen 

 Typus der Art dar, wie er in der Zone des Lyt. jurense vorkommt. Die Bxemplare, 

 die man in den Sammlungen unter dem Namen Amm. Aalensis findet, kommen fast 

 alle aus der Zone des Harp, opalinmn von Gundershofen oder von la Verpilliere 

 und gehoren dem Typus an, den d'Orbigny, Dumortier, und Bayle abbilden und der 

 vom Zieten'sche etwas abweicht. Dennoch mochte icli die Figuren der eben- 

 genannten Autoren als massgebend fiir die Bestimmung der Art betrachten, um 

 so mehr als die scbwabiscken Exemplare keineswegs die charakteristisclien 

 Merkmale, also vor allem die starken V-formig gestellten Rippen, scharf ausge- 

 pragt zeigen." 



Gramm. aalense occurs at Haresfield Hill, Buckholt Wood, Frocester Hill, 

 Gloucestershire. I have a specimen from Somerset labelled " Sands, Crewkerne 

 Station," but I do not know the exact locality. In Dorset the species occurs at 

 Burton Bradstock in a rock-band which lies towards the top of the cliflP of yellow 

 Sands. 



PI. XXXII shows the various forms of this species. Figs. 1, 2, represent 

 the two views of a very fine adult specimen with well-preserved test ; the upper 

 part of this specimen I was fortunate enough to obtain some six months after the 

 other part had been placed in my cabinet. Fig. 3 illustrates a small specimen, 

 without test, with the lateral lappet of the mouth-border. Fig. 4 is the side 

 view of another specimen ; fig. 5 is a sectional view of its ventral area ; while 

 fig. 6 exhibits its suture-line. In figs. 7 and 8 is shown a variety which has 

 the latter portion of the outer whorl smooth, and this apparently indicates how 

 Gramm. leurum has been evolved. All these specimens are from Frocester Hill. 

 Figs. 9, 10, illustrate a specimen from the Yeovil Sands of Burton-Bradstock 

 Cliff; it is in the collection of Mr. W. H. Hudleston. 



In PL XXXI, figs. 15, 16, are depicted what is an ill-shaped, perhaps 

 diseased, form of this species ; it is without test, and its ribs being rather faintly 

 marked cause an apparent convergence towards Gramm. lotharingicum or 

 suhcomptum. Fig. 16 shows that the two sides are not equal. The specimen 

 came from Haresfield Hill (Moorei-heds). 



