224 BRITISH FOSSIL TRIGONIif]. 



Our notices of the Jurassic Trigonice of the other continents must be understood as 

 relating chiefly to their natural alRnities as species, and not to their stratigraphical 

 positions, which, in some instances, are only doubtfully and imperfectly known. 



We are absolutely without information of the presence of a single Jurassic Trigonia 

 in the continents of America. In Asia one of the Undulates occurs in the mountain 

 district of the Lebanon, to the eastward of the town of Beyroot; apparently it is 

 identical with T. imdulata, Fromherz, from the Piedmontese flanks of the Alps (p. 77) 

 and nearly allied to a Trigo7iia of the Cornbrash and Great Oolite in Britain (p. 201). 



In Cutch three of the Costatce have been obtained, two of which nearly resemble 

 T. cosfata, Sow., and T. pullus. Sow., British species of the Middle and Lower Oolites, 

 and are so named ' Geol. Trans.,' 2nd ser., vol. v, pis. 21 — 23; the third, a large, 

 lengthened, and oblong form, distinct from all others, is named by Sowerby T. Smeeii, 

 ' Geol. Trans.,' 2nd ser., vol. V, pi. 61. The Ammonites associated with these species 

 are, for the most part, identical with British Kelloway Rock forms. 



In Northern India the Spiti Pass of the Himalayas affords a fossil Jurassic fauna, 

 which Dr. Stoliczka has assigned to certain Conchifera of the European Rhaetic beds, 

 Lias, and Lower Oolites, Trigonia costata is one of these, ' Quart. Jour, Geol. Soc.,' 

 1868, p. 506, vol. xxiv. 



The only record we possess of Jurassic Trigonia in Australia is the memoir on 

 Australian Mesozoic Geology and Palseontology, 'Quart. Jour. Geol. Soc.,' May, 1870, 

 by Mr. C, Moore, who has therein figured and described two considerable series of 

 fossils from Queensland, and from Western Australia upon the opposite sides of Australia, 

 separated by upwards of 38° of longitude, and by the great central Sahara. The West 

 Australian series contains Ammonites, Conchifera, and Brachiopoda, some of which 

 cannot be distinguished from British species of the Middle Lias, Upper Lias, and Lower 

 Oolites, including Trigonia Moorei, Lye. (p. 151), which occurs in some abundance, a 

 single block having contained fifteen specimens. The Queensland fossils from Wollum- 

 billa and other localities are almost entirely distinct from known European forms : they 

 are preserved in loose blocks evidently derived from beds more ancient than the 

 surrounding strata ; numerous in species, two only are believed to be identical with 

 European shells : one is Avicula Braatnburiensis, a species which has a considerable strati- 

 graphical range in Britain, and is so nearly allied to other forms of the same genus that 

 great care and an excellent condition of preservation are necessary in its discrimination ; 

 the other is Lingula ovalis, which differs little from the L. subovalis of Neocomian 

 strata. Mr. Moore has described and figured Trigonia lineata, pi. 13, fig. 12, an 

 ill-preserved fossil, one of the Glabra, a short, gibbose form, with numerous concentric 

 regular lines upon the anteal and middle portion of the shell, but the posteal or anal 

 portion is imperfect ; it lias some affinities with the Portlandian group of T. gibbosa, 

 and is apparently yet more nearly allied to an Indian Cretaceous species, T'. orientalis or 

 suborbicularis, Forbes, from Southern India (see page 121); the latter has the concentric 



