Manchester Memoirs, I "<>/. /.v/i. (1917 ) , v 



Of the very few specimens 1 have found, the megalospheric 

 form, N sub-trregulans, is larger than the microsphere one 

 JV. trn-guluns. but this seeming anomalj is easily accounted foj 

 as my specimens of the latter have the appearance of being all 

 young tests. 1 he spue has very few convolutions, tne shell wall 

 is very thin, and the irregularity of growth is not so marked 

 as it would be in mature specimens. Another point to be noticed 

 is that the two forms have been found in about equal quantities, 

 but as both are rare this must not be taken as an ordinary, but 

 rather as a very extraordinary state of affairs. Auv conclusion 

 as to the proportional rarity of the two forms founded on mv 

 collections would undoubtedly be a false one, the material being 

 much too limited in quantity to allow of any satisfactory results 

 being arrived at. bins applies equallj to all the Vummulites 

 which I have found in these Mails. 



331. NUMMULITES VARIOLARIA (l.anui.L ) 

 33IA. NUMMULITES HEBERTI, d'Aivhiae. 



Lenticulites variolaria, Lamarck, [804, Ann. ivlus., vol. V, p. 



187, No. 2. 

 Num. variolaria, De la Harpe, 1883, Mem, Soc, Palfiont, Suisse 



vol. X. p. 177, pi. VII, figs. J4-3J. 

 Ninti. heberti, d'Archiac & llaime. [853, Descrip. Anim. groupe 



Nummulitique fnde. vol. I, p. 147. pi. IX, figs. 14 15. 



Of these two forms the megalospheric A. variolaria is 

 smaller and more plentiful than its companion. It is also tin- 

 commonest Nummulitc in my collections and generally \<i\ 

 well preserved. 



332. NUMMULITES GUETTARDI d' Aiehiai \ llaime 

 33_'A. NUMMULITES B1ARITZENSIS, d'Archiac iK' Mamie. 



Num. guettardi, d'Archiac & Haime. [853, Desci Anim. 

 groupe Nummulitique Ende, vol. I. p. [30, pi VII, figs. 



|S 10. 

 Num. biaritzensis, d'Archiac X- llaime. [853, Descr. Anim. 



groupe Nummulitique Inde, vol. I, p. 131, pi, Vil, figs. 



4-5- 



N . guettardi (Form A) is much smaller and far outnumbei 1 

 N. biaritzensis, and my specimens are in more favourable state 

 of preservation for examining the interior structure, being 

 often free from any infiltration of foreign matter whilsl the 

 few examples found of N. biaritzensis are hard, and very little 

 else than blocks of crystalline limestone, so that it is difficult to 

 make out their true character. 



