248 Dr. H. Falconer on the alleged Occurrence of Flint Knives 



the outer margin. Height 0*2 inch, greatest breadth 



0-32 inch. 



This shell resembles H. pudica, Drouet, in shape, but is much 

 larger. It is also distinguished by the bands of colour. It is, 

 with Achatina octona, the commonest of land shells in Trinidad, 

 and it is the only species of mollusk I have ever observed on the 

 guava {Psidium pomiferum), a plant which is shunned by most 

 animals on account of its strong aromatic taste and smell. 



The foot of the animal is acutely pointed behind ; the eyes 

 quite sessile on the outer side of the tentacles, which are long 

 and obtusely pointed. The hairy periostraca of the shell readily 

 comes off, and is rarely seen in cabinet examples. 



The lingual dentition is 00.3.1 .3.00. The lingual teeth of 

 this species closely resemble those of H. zonata, which I have 

 already described ; but in H. barbata the two inner laterals are 

 glassy and pellucid. The central tooth is broader, and seems to 

 be divided longitudinally. The minute slender uncini are pro- 

 bably about fifty, becoming almost indistinguishable towards 

 the edges of the dental band. 



It is ray intention to forward to the British Museum the types 

 of the species here described so soon as this communication shall 

 have been made public. 



Port of Spain, Trinidad. 

 August 2, 1864. 



XXVIII. — On the Asserted Occurrence of Flint Knives under a 

 Skull of the extinct Rhinoceros hemitoechus, in an Ossiferous 

 Cave in the Peninsula of Gower. By H. Falconer, F.R.S., S^c, 



To the Editors of the Annals of Natural History. 



Gentlemen, 



In the important memoir by MM. Lartet and H. Christy, 

 on the Ossiferous Caves of the Perigord, a statement occurs on 

 the above head which demands correction by me. After com- 

 menting on the proofs of the co-existence of Man with certain 

 extinct species, such as Elephas primigenius. Rhinoceros ticho- 

 rhinus, &c., M. Lartet adds the following passage : — 



" Cette hypothese de la contemporaneity humaine s'etendrait 

 meme k une autre espece d^el^phant [E. antiquus, Falc.) dont 

 Pextinction est reputee plus ancienne encore. Les restes de cet 

 elephant ont ete recueillis, en France, a Saint-Roch, pres Amiens, 

 k Chchy, pres Paris, et kViry-Noureuil (Aisne), dans des assises 

 diluviennes ou quaternaires renfermant aussi des silex tallies de 

 main d^homme. On n'a pas, que nous sachions, encore observe 



