344 Mr. W. T. Blanford on a Species of Plectopylis 

 Ta b l e — continued. 



Rhynchonella sulcata, var 



Ostrea frons 



Ostrea vesicularis 



Ostrea Normaniana 



[^.Ostreal 



Exogyra conica 



Exogyra haliotoidea 



Exogyra Rauliniana 



Anomia (n. sp.) 



Pecten orbicularis (fide Murchison) 



Pccten Beaveri 



Avicula gryphceoides * 



Inoceramus Coquandii 



Iiioceramus Crispii 



Inoceramus gr)'phBeoides 



Inoceramus lajviusculus 



Inoceramus sulcatus 



Inoceramus tenuis 



Spondylus latus 



Spondylus 



Trigonia Hunstantonensis 



Crioceras occultus 



Ammonites alternatus 



Ammonites coni])lanatus 



Ammonites rostratus 



Ammonites serratus 



Ammonites auritus 



Belemnites attenuatus 



Belemnites minimus 



Belemnites ultimus 



Nautilus simplex 



Edaphodus (n. sp.) 



Otodus aj^pendiculatus 



Polyptycliodon 



Peculiar. 



Chalk. 



Upper 

 Green- 



Gault. 



XXVII. — Note on a Species of Plectopylis, Benson, occurring in 

 Southern India. By W. T. Blanford, of the Geological 

 Survey of India. 



In looking over a collection of shells made last year in the Nil- 

 giri Hills of Southern India, I noticed that all the specimens 

 of the little H. retifera, Pfr., were marked with white dots upon 

 the translucent base of the last whorl, resembling those which 

 correspond to the internal plaits and teeth in H. plectostoma, 

 Benson. On cutting into the shell, I found it to possess the 

 following characters, which prove evidently that it must be 

 classed with that group of Helices for which Mr. Benson (in the 

 * Scarcely less abundant than in the Upper Greensand of Cambridge. 



