N0 . 2> ] STRATIGRAPHIC RESULTS. 125 



The fauna of the strata found NW. of Elmwood near the shore is distin- 

 guished by the particularly abundant remains of Pseudomonotis Jacksoni n. 

 sp. The frequent occurrence of a Pseudomonotis might lead to the suppo- 

 sition that we have before us deposits of Triassic age, as Pseudomonotis spe- 

 cies play a very important role in the Trias strata of the Pacific and Arctic 

 regions (Siberia, Spitzbergen). But apart from the fact that our species shows 

 no correspondence with such Triassic Pseudomonotis, its occurrence together 

 with Belemnites also proves, that we cannot have to do here with deposits of 

 Triassic age. The Elmwood deposits, which lie a short distance NW. of the 

 hut, at a height of from 23 to 33 feet above the sea, must belong to the 

 Jura. In the Jura also, the Pseudomonotis are of no uncommon occurrence; 

 in certain horizons they even preponderate: I may mention Pseudomonotis 

 substriata in the Upper Lias, Pseudomonotis elegans in the Bajocian, Pseu- 

 domonotis echinata in the Bathonian. 



Pseudomonotis Jacksoni is worthless, as a new species, for the accurate 

 determination of the horizon. 



The Brachiopoda found together with Pseudomonotis Jacksoni are of 

 greater importance. Although, on the basis of these forms, it is not possible 

 to determine with absolute certainty a single faunistic zone, yet they point 

 to the Brown Jura, but not the Callovian. 



Lingula Beani Phill. is not confined to a single faunistic zone. In York- 

 shire it occurs in the Blea Wyke Beds, and perhaps also in the so called 

 "Dogger", consequently in the zones of Leioceras opalinum and Ludtvigia 

 Murchisonae. Brauns records it from the zone of Trigonia navis of 

 north-western Germany. Quenstedt mentions it from the zone of Lud- 

 ivigia Murchisonae of Wiirttemberg. Lepsius and Haas found it in the 

 zone of Sphceroceras Sauzei of Lower Alsace. Terquem and Joudry 

 record Lingula Beani from the zone of Amm. subfurcatus and Niortensis, 

 in the department Moselle. Trautschold claims to have found Lingula 

 Beani even in the "Couches de Mniowniki" of the Jura of Moscow. The 

 imperfect illustration and description which Trautschold gives of his 

 Lingula Beani does not suffice for determination as to whether the true 

 Lingula Beani really does occur in such high horizons. Lingula 



