Dr. Lycett — On Trigonia Elisce, from the Oreensand. 195 



bourhood of Oxford," etc., is by Prof. Eupert Jones, F.B.S., who found 

 in a small slab of the Ironstone a few bivalved Entomostraca, which he 

 refers to a species of Candona, and four species of Cypridea. They 

 are described in the G-eol. Mag., 1878, Decade II. Vol. V. pp. 100 

 and 277. They are Wealden species. 



P.S. — Since writing the above, I have taken a few of the remains 

 up to tbe British Museum, where they have been submitted to ex- 

 amination and comparison by Mr. William Davies, F.G.S., who has 

 kindly pointed out to me that there are, among these, portions of 

 jaws with successional teeth ; dorsal, sacral, and caudal vertebrae, 

 scapula, humeri, pelvic bones, portions of femora, fibulae, astragalus, 

 phalanges; and other bones not yet determined. Mr. Davies has no 

 doubt that the remains are those of a young Iguanodon, the epiphyses 

 of the limb-bones being unanchylosed. — J.P. 



II. — On Trigonia Elisje — Cornet and Briart. 1 

 By Dr, Lycett. 



THE Whetstones (Meule) of Bracquegnies, Belgium, are upon the 

 same geological horizon (zone of Ammonites inflatus, Sow.) and 

 are identical lithologically with the well-known Whetstones of 

 Blackdown ; like to the latter deposits they are characterized by the 

 prevalence of Trigonice which are allied to, but are for the most part 

 not strictly identical with the species of Devonshire. The Trigonia 

 Elisce, Cornet and Briart, herewith figured, is allied to and equals in 



Trigonia Elisce, Cornet and Briart. — Greensand, Bracquegnies, Belgium. 

 1 2 



Fig. 1. Side view. Fig. 2. Umbonal view. 



abundance the well-known T. aliformis, Park., of Blackdown, and is 

 the Belgian representative of that group of Trigonice. Like the 

 Devon species it is remarkable for the great length of the hinge- 

 border, and the produced, attenuated posterior side, with its short 

 siphonal border ; but is without the anteal inflation of the valves 

 and the peculiarities of the eostas which distinguish T. aliformis, 

 Park. For the latter, see Monograph of British Fossil Trigonias, 

 Palseontographical Society, 1877, pi. 28, figs. 5, 5a. 



Another abundant Trigonia at Bracquegnies is the T. dcedalea of 

 Cornet and Briart. This differs from the well-known common 



1 Cornet and Briart, Description de la Meule de Bracquegnies, Memoires 

 Couronnes et Mem. des savant Etrangers, Acad. Boyal de Belgique, t. xxxiv. 1868. 



