G. C. Crick — Note on Aminonites euomphalus, Sharye. 253 



of outer whorl above preceding whorl, 13-5 mm. ; thickness of outer 

 whorl (excluding spines), 21-5 mm. The specimen is fairly well 

 preserved ; the inner whorls are, however, imperfect on one side, and 

 on the other obscured by matrix if present. The suture-line is 

 displayed where the fossil has a diameter of 33 mm. ; it is repre- 

 sented in Fig. \c. One side of the earlier portion of the outer whorl 

 bears marks of an injury during the life of the animal. 



So far as I know, these are the only two examples that have been 

 recorded as belonging to this species. 



)Phr> 



'Fig. 2. — DouviUSiceras euomphalus (Sliarpe). — a, lateral view; b, peripheral view 

 of the same specimen ; c, suture-line of the same example as seen at the place 

 marked s in a and b. Lower Chalk: Humble Point, close to Whitlands, 

 west of Lyme Regis. Drawn of the natural size from the example in the 

 British Museum (Nat. Hist.) that was collected and presented to the 

 Museum hy Dr. Eowe and CD. Sherborn, Esq. 



Among some Chalk fossils recently collected by Dr. Arthur Eowe, 

 F.G.S., and Mr. C. Davies Sherborn, F.G.S., from the " hard nodular 

 Cenomanian Limestone with grit and green grains, half a mile from 

 the shore at Humble Point, close to Whitlands (west of Lyme 

 Kegi>s), Devonshire," there is a specimen which I consider to be 

 referable to Sharpe's species (see Figs. 2a-c). Being entirely 

 septate, and therefore incomplete, it does not furnish the characters 

 of the adult shell ; nevertheless, it is a particularly interesting 

 specimen, for being larger than either of the previously recorded 

 examples, the characters which it displays more nearly approach 

 those of an adult shell. A portion of the outer whorl is missing, 

 but the rest of the fossil is well preserved ; the inner whorls are 

 present, and the suture-line is shown. The dimensions of the 

 specimen are : — Diameter of shell, 43 mm. ; width of umbilicus (at 

 suture of shell), 16 mm. ; height of outer whorl (excluding spines), 

 16 mm.; height of outer whorl above preceding whorl, not seen ; 

 thickness of outer whorl (excluding spines), 23 mm. The inner 

 whorls up to a diameter equal to that of Sharpe's type-specimen 

 can be plainly seen ; they are fairly well preserved. The 



