42 



below, and the basal emargination is rather deeply concave. If 

 measured outside of the emargination, the height of the aperture is 

 rather greater than the width ; if in the centre, the width slightly 

 exceeds the length. In other words, the lateral compression of the 

 whorls is so little, that it is not equal to the depth of the emargination. 

 In the adult shell, the umbilical margin is evenly rounded. 



The sculpture consists for the most part of obliquel}^ transverse 

 distant, periodic furrows or constrictions. About six of these can be 

 counted in the outer whorl of each of the specimens ; they are directed 

 obliquely forwards on the sides, and then bend backwards so as to form 

 a series of shallowly concave sinuses on the periphery. Besides these, 

 there are a few faint revolving lines on the siphonal edge, and some 

 still fainter strise of growth across the whorls, but both are so incon- 

 spicuous that, apart fi'om the narrowly concave constrictions, the surface 

 is practically smooth. 



Septation unknown. 



The three Ammonites described above agree so exactly with Stoliczka's 

 description and figures of ^. Timotheanns, that they are provisionally (at 

 least) regarded as belonging to that species. In the absence of any 

 definite knowledge of the septation of the Queen Charlotte Island 

 specimens, their identification is, of course, somewhat uncertain. The 

 memoir in which A. Timotheanus was first described is, unfortunately, 

 inaccessible to the writei-. According to Stoliczka, Pictet originally 

 recorded it as a fossil of the " Clres Verts " of Saxonet in Savoy. It 

 was afterwards noticed by D'Oi'bigny, G-ras and others, from the Gault 

 and Etage Albien (Lower Chalk) of the South of France. Hauer thinks 

 that specimens of an Ammonite from the Gault of South- Western 

 Hungary may belong to this species. In India, A. Timotheanus has 

 been collected from the "Trinchinopoly Series of Serdamungalum, North 

 of Anapaudy and near Ondoor; " also from the " Ootatoor Series of the 

 neighbourhood of Odium : Mooraviatoor and Penangoor." It was first 

 catalogued as a British fossil in 18*75. In the Quarterly Journal of the 

 Geological Society of London (Vol. XXXL, pp. 211 and 306), Mr. 

 A. A. Jukes Brown says that it is found, though rarely, in the 

 phosphatic deposits of the Upper Gault, or "Etage Vraconnien," at 

 Cambi'idffe. 



