riLSBKY : ox DOFCASIA, TBIGOXEPBRCS, ETC. 291 



BIBLIOGRAPHY. 



1838. Gray: Appendix to James Edward Alexander's " Expedition 

 of Discovery into the Interior of Africa," vol. ii. 



1870. Semper: " Reisen im Arcbipel der Philippinen," iii, Land- 

 mollusken. 



1894. Simrotli : BericM Senckenberojischen Naturforscli. Gesellschaft. 



1895. Pilsbry, "Guide to tbe Study of Helices": Manual of 



Conchology, vol. ix. 

 1897. Wiogmanu : in Weber, " Zool. Ergebnisse ciuer Eeise in 

 Jv'iederlandiscb Ost-Indien," vol. iv. 



EXPLANATIOX OF TLATES. 



Plate XIII. 



Figs. 1-3. — Genitalia, luuscles, and lung of Corilla Humhcrti. 

 ,, 4, 0. — Genitiilia and pallial organs of Thfrsites meridionalis. 

 ,, 6-9. — Genitalia, pallial organs, and fore-gut of Ti-igonephrus ghbtilns. 



Pl.^te XIV. 



Figs. 10, 11.— Teeth of CoriUa Humberti. 

 Fig. 12. — Outermost marginal teeth of same. 

 Figs 13, Li. — -Teeth of Trigoiiephrus globulus. 

 ,, 14, 16-19. — Pallial organs, genitalia, jaw, and teeth of Cfiloritisfrayilis. 



