part 4] JUEASSIC CHEOXOLOGT : LIAS. 321 



A. saiizeanus. — The large specimen is said to be of the natural 

 size — Explanation of pi. viii of Mon. ; it is actually x 0'7. It is 

 figured half of the natural size in C. C. Diameter there given as 

 8 inches, in Mon. as 205 mm. 



The small shell is said to be of the natural size in Mon. 

 It is figured x 0*73 of this in C. C. paper. 



A. turneri. — Shell figured of reduced size, X 0*7, in C. C, but 

 same -side shows nearly all inner whorls as missing. Same pro- 

 portions given in C. C. & Mon. In C. C. fig. 4« is described as 

 'Quenstedt's figure of the septa,' Explan. of Plate. In Mon. fig. 5 

 is an exact copv but enlarged, apparentlv from Bredon specimen 

 (p. 292). 



A. hroohi. — 'Dimensions. — Transverse diameter 5| inches 

 [140 mm.] ; height of outer whorl at the aperture, 2y\ inches 

 [56 mm.]; width 1| inch [38 mm.].' C. C. p. 174. In Mon. 

 140 mm. 55 mm. 40 mm. Shell figured 0"65 in C. C. paper and 

 front view given — a detail lacking in Mon. Fig. 5 « in C. C. ' lobes 

 and saddles from Zieten " (Explan. of Plate). Fig. 5 in- Mon., copy 

 of C. C, 'foliations . . . from another specimen . . . My Collection.' 



A. rotifonnis. — Specimen figured in C. C. paper, peripheral view 

 onh", 'I nat. size' inscribed on Plate. Diameter (p. 238), 7 inches; 

 therefore figure is X 0*74. Natural size in Mon. 



On p. 279, Mon. the sentence ' Compare, for example, the sutures 

 in PL iii, fig. 2, with those in PI. iv, fig. 2 ' does not refer to Mon., 

 but is understandable from C. C. paper. 



A. conyheari. — In C. C. ' h nat. size ' inscribed on PI. Figure 

 175, 19, 20, 64-5. Dimensions (p. 236): 10^ inches, 2 inches, 

 2 inches=T. 260, 19-5, 19-5, — , figured therefore x 0-67. Same 

 figs, same size in Mon.; but Wright (p. 273) gives dimensions 

 340 mm. (13| inches), 60 mm., 68 mm., — , = T. 340, 17-5, 20, — . 

 Wright has roughly doubled the diameter of the C. C. fig. instead 

 of giving the dimensions of his text. Loc. Weston, C. C. p. 236, 

 Salford,^Mon. p. 273, Saltford, Expl. PI. ii. 



A. ohtusus. — Inscribed on C. C. pi. ' | nat, size,' shows a con- 

 tracted umbilicus and inner whorls wanting or hidden in matrix. 

 Dimensions not given in C. C. Same figures, same size given in 

 Mon.. but with more open umbilicus showing inner whorls. 'Nat- 

 size' in Explanation of pi. xxi. Dimensions in Mon. (p. 293) 

 155 mm., 65 mm., 58 mm., 55 mm. This makes figs. xO-70. 

 Figiu'es in C. C. and Mon. do not agree one with the other, nor 

 with the text as regards proportions. 



A. midticosfatus. — In text C. C, p. 240, 'A. hisulcatus.' The 

 figure of C. C. not reproduced in Mon. In C. C. ' Dimensions. — 

 Transverse diameter 8 inches ; height of aperture 2| inches ; width 

 of aperture 2.| inches.' In Mon. p. 276 are the same dimensions 

 turned approximately into millimetres 200, 70, 64, but applied to 



Q. J. G. S. No. 292. 2 c 



