436 NATURAL SCIENCE. Dec. 1894. 



cation, did not find its way into print until quoted in the Proceedings 

 of that Association in April, 1892(4). The suggestion, put briefly, 

 was that, at an early period, the Cephalopoda split into two great 

 divisions : one division — which, starting with a very fragile protoconch, 

 soon lost it altogether — may be called the Lipo-protoconchia, and is 

 practically co-extensive with the Nautiloidea ; the other division — 

 which, starting with a stouter protoconch, preserved it, either by the 

 coiling of the conch around it as in the Animonoidea, or by its 

 ensheathement in the mantle as in the Coleoidea — may be called the 

 Sosi-protoconchia. And it was further suggested that such a classifica- 

 tion, based upon ascertained facts of shell-structure, might prove 

 superior to other classifications based upon suppositions as to the 

 soft parts which could never be confirmed. 



REFERENCES. 



I. Bather, F. A.—" Shell-growth in Cephalopoda (Siphonopoda)." Ann. Ma^. 



Nat. Hist. (G), vol. i., pp. 298-310; 1888. 

 2. " Professor Blake and Shell-growth in Cephalopoda." torn. 



cit., pp. 421-427 ; 1888. 

 3. " Classification of the Cephalopoda." Amer. Geol., vol. x. 



pp- 396. 397 ; 1892. 



4. Blake, J. F. — "The Evolution and Classification of the Cephalopoda, &c." 



Proc. Geol. Soc, vol. xii., pp. 275-295, with folding tables ; 1892. 



5. Branco, W. — " Ueber die Anfangskammer von Bactritcs." Zeitschr. deutsch. 



geol. Ges., vol. xxxvii., pp. 1-9 ; 1885. 



6. Clarke, J. M. — "The Protoconch of Orthoceras." Amer. Geol., vol. xii., 



pp. 112- 115; 1893. 

 7. "The Early Stages of Bactrites." Amer. Geol., vol. xiv., 



PP- 37-43 ; 1894. 

 8. " Nanno, a new Cephalopodan Type." torn, cit., pp. 205-208 ; 



1894. 

 9. Foord, A. H. — " Catalogue of the Fossil Cephalopoda in the British Museum, 



&c. Parti." London, 8vo ; 1888. 



10. Holm, G. — " Uebere die innere Organisation einiger silurischerCephalopoden." 



Palaont. Abhandl., vol. iii., Heft i ; 1885. 



11. Hyatt, A. — "The Evolution of the Cephalopoda." Science, vol. iii., pp. 122- 



127 and 145-149; 1884. 

 12. " Genesis of the Arietidae." Smithsonian Conitib., no. 672 ; 1889. 



13. Schwarz, B. H. L.— " The Descent of the Octopoda, &c." Joiirn. Marine 



Zool., vol. i., pp. 87-92; 1894. 



14. Seeley, H. G.— " On the Septa and Siphuncles of Cephalopod Shells." Qnart. 



Joiirn. Set., vol. i., pp. 760-762 ; 1864. 



15. Steinmann, G.— " Vorliiufige Mittheilung iiber die Organisation der Ammo- 



niten." Ber. naturf. Ges. Freiburg i. B., vol. iv.. Heft 3, pp. 31-47 ; 1888. 

 See also " Elemente der Palaontologie," 2 Hiilfte, 8vo, Leipzig ; 1890. 



16. Waagen, W.— " Palasontologia Indica, ser. xiii., Salt-Range Fossils, ib. 



Cephalopoda"; 1879-1880. 



F. A. Bather. 



