130 THE NAUTILUS. 



Unfortunately the fully matured form with the secondary growth 

 has not yet been found. 



The fact certainly seems to be that the range of Gundlachia, like 

 that of Ferrissia is world-wide and the two are apparently coincident. 

 It is quite possible that others of the so-called Ferrissias will eventu- 

 ally prove to be the non-septate forms of Gundlachia. At the same 

 time, if the evidence afforded by the North American species is to- 

 be relied upon, it is only certain species of "Ferrissia " that ever be- 

 come septate. There is no evidence, so far as I know, that the 

 typical species of Ferrissia ever form a septum. 



BIBLIOGRAPHY. 



1870. Blanford, W. T. Observations on the Geology and 

 Zoology of Abyssinia. 



1862. Bourguignat, J. R. Spicileges Malacologiques. 



1883. Bourguignat, J. R. Histoire Malacologique de 1'Abys- 

 sinie. 



1882. Clessin, S. Conchylien Cabinet, Ancylien. 



1869. Dohrn, H. Die Binnenconchylien der Capverdischen 

 Inseln. Mai. Blatt., XVI, pp. 1-23. 



1881. Fischer, H. Manuel de Conchyliologie. 



1909. Germain, Louis. La Malacographie de 1'Afrique Equi- 

 toriale. Arch. Zool. Exp. et Gen. (5), I, pp. 1-165. 



1913. Germain, Louis. Mollusques de la France, II. 



1848. Gould, A. A. Proc. B. S. N. H., II, p. 210. 



1902. Grabau, A. W. Studies of Gastropoda. Am. Nat., 

 XXXVI, p. 917. 



1912. Hannibal, Harold. A Synopsis of the Recent and Terti- 

 ary Mollusca of the Californian Province. Proc. Mai. Soc., Lon- 

 don, X, p. 112. 



1894. Hedley, Charles. On the Value of Ancylastrum. Proc. 

 Mai. Soc., London, I, p. 118. 



1895. Hedley, Charles. On the Australian Gundlachia. 

 NAUT., IX, p. 61. 



Mr. John Farquhar of Grahamstown, Cape Colony, two specimens of a fully 

 matured Gundlachia from that region. To which, if any, of the recently de- 

 scribed species of Ferrissia from South Africa this form is to be approximated 

 I am as yet uncertain. But the occurrence of the genus from both of the ex- 

 treme ends of Africa is certainly a matter of great interest. 



