164 Messrs. W. K. Parker and T. R. Jones on the 



only having been found in the Lower Chalk (Craie chloritee 

 inferieure — I'etage Turonien) at the mouth of the Gironde. 



In Bronn^s ' Leth. Geognost/ 3rd edit. vol. iii., we find another 

 elaboration of the nomenclature of this genus. Objecting to 

 " Discolithus/^ " Alveolites/' and " Alveolina/' Bronn follows 

 Ehrenberg in adopting Montfort's term "Borelis" (which we 

 regard as unnecessary) ; and, with the four species described in 

 the ' Lethsea/ the synonymy is abundant. D'Archiac and Haime 

 also give the synonymy of three species (Fossiles de I'Inde, 

 1853, p. 348, &c.). 



The following is a still more complete synopsis of the chief 

 known varieties of Alveolina. 



1. Nautiloidjdiscoidal, much- compressed variety. Alveolina Rotella,jyOT\i. 



1846. Orbiculina Rotella, B'Orb. For. Foss. Vienn. p. 140, pi. 7. figs. 13, 14. 

 D'Orbigny himself notices the marked difference between this 

 and the known Orbiculince in the style of its spiral growth and its 

 outer border. 



2. Spherical and oblate-spheroidal variety. Alveolina Melo, var. a, F. & M. 



1802. Discolithus XL, Fortis, Mem. ii. p. 112, pi. 3. figs. 6, 7; pi. 4. fig. 4. 



1803. Nautilus Melo, var. a, V. Sf M. Test. Micr. p. 118, i)l. 24. figs. a-f. 

 1808. Clausulus Indicator, De Montf. Conch. Syst. i. p. 178. 



1816. Melonites sphjerica, Lamarck, Encycl. Meth. pi. 469. fig. 1 a-f. 

 1824. Melonia sphserica, Blainville, Diet. Sc. Nat. xxxii. p. 176, Conch. 



pi. 15. fig. 2. 

 1826. Alveolina Melo, D'Orb. Ann. Sc. Nat. vii. p. 306. no. 2. 

 1828. Alveolina Melo, Desk. Ann. Sc. Nat. xiv. p. 230. 

 1846. Alveolina Melo, D'Orb. Foram. Foss. Bassin Vienne, p. 147, ph ?• 



figs. 15, 16. 

 1853. Alveolina Melo, Carter, Joum. Bombay Asiat. Soc. v. p. 134, pi. 2. 



fig. 16. 

 1853. Alveolina Melo, D'Jrch. ^ H. Foss. de I'Inde, p. 348. 



3. Prolately spheroidal variety. Alveolina Melo, var. /3, F. & M. 



1803. Nautilus Melo, var.^, F. c^ M. Test. Micr. p. 118, pi. 24. figs.^r, h. 

 1808. Borelis melonoides, De Montf . Conch. Syst. i. p. 170. 

 1816. Melonites sphaeroidea. Lam. Encycl. Meth. pi. 469. fig. 1 y, h. 

 1824. Melonia sphseroidea, Blainv, Diet. Sc. Nat. xxxii. p. 176, Conch. 



pi. 15. fig. 3. 

 1826. Alveolina Melo, D'Orb. Ann. Sc. Nat. vii. p. 306. no. 2. 

 1828. Alveohna Melo, Desk. Ann. Sc. Nat. xiv. p. 230. 



1838. Melonia costulata, Eichwald, Zool. Spec, ii.; Viln. pi. 2. fig. 1. 



1839. Alveolina pulchra, D'Orb. Foram. Cuba, pi. 8. figs. 19, 20. 



1842. Melonia (Borelis) sphseroidea, Ehrenb. Monatsber. Akad. Wiss. 1842, 



p. 274. 

 1846. Alveolina Hauerii, D'Orb. Foram. Foss.A- ienn.p. 148, pi. 7. figs. 17,18. 

 1848. Alveolina subpyrenaica, var. globosa, Leym. Mem. Soc. Geol. France, 



2 ser. i. p. 360, pi. 13. fig. 10. 

 1853. Alveolina sphseroidea, Carter, Joum. Bombay Asiat. Soc. v. p. 134, 



pi. 2. fig. 16. 

 1853. Alveohna sphasroidea, D'Arch. ^" H. Foss. de I'Inde, p. 348. 



