T. H. Withers — Neio Species of Cirripedes. 505 



Finally, it .seems possible to form some idea of the width, of the 

 sea space between the opposing shores of the Atlantic and Arctic 

 continents of Cambrian time. Supposing its average breadth on the 

 European side was equal to the distance from lat. 50, which touches 

 the south of Cornwall, to the Faroe Islands ; this is about 850 miles^ 

 which is double the average width of the Mediterranean, and is 

 consequently quite a sufficient distance for the development of 

 a considerable depth of water. 



Hence, it is very probable that the marine inhabitants of the 

 northern shore of the Cambrian Atlantic Sea would be different from 

 those of the southern shore, and that such a broad expanse of 

 comparatively deep water would prevent migration from one side 

 to the other, especially if a strong current swept along the northern 

 side from west to east and a return current set in the opposite 

 direction along the southern side. The American character of the 

 Scottish Cambrian faunas will thus be satisfactorily explained. 



VI. — Two New Species of Cieripedia feom the Tithonian op 

 Stramberg, Mokavia. 



By Thomas H. Withers, F.G.S. 

 (PLATE XXIII.) 



DR. M. REMES, of Olmiitz, Bavaria, recently submitted to 

 Dr. F. A. Bather for determination, a small suite of fossils 

 collected by him from the Tithonian of Stramberg, Moravia. Among 

 them were two Cirripede valves which Dr. Bather kindly handed to 

 me for identification. These two carinal valves cannot be referred to 

 _any of the described species, and, since they differ much from each 

 other in size and ornament, I have felt myself compelled to describe 

 them as separate species. The specimens remain in the collection of 

 Dr. M. Remes, but reproductions are preserved in the Geological 

 Department of the British Museum. 



Systematic Position. — Although we have only two carinas before us, 

 it is possible, with some probability of correctness, to indicate their 

 systematic position. 



In the known species of Archceolepas the carina is very small, 

 somewhat triangular in shape, and slightly expanded at the basal 

 angles. The present carinse, therefore, cannot with much confidence 

 be referred to that genus. 



It seems much more probable that they belong to the genus 

 Brachylepas, rather than to Pollicipes. The genus Brachylepas was 

 founded (1901)^ to embrace a single species, Pyrgoma cretacea, 

 H. Woodward [ = Brachylepas JVaissanti, Hebert, sp.),- from the Upper 

 Senonian, but Dr. Woodward subsequently (1906) ^ referred to it the 



■^ H. Woodward, "On ^Pyrgoma cretacea', a Cirripede, from the Upper 

 Chalk of Norwich and Margate" : Geol. Mag., Dec. IV, Vol. VIII, p. 150, 

 1901. 



- See T.H. Withers, "The Cirripede ' Brac/ii/Zepascretocea', H.Woodward" : 

 Geol. Mag., Dec. V, Vol. IX, p. 321, 1912. 



^ H. Woodward, "Cirripedes from the Trimmingham Chalk and other 

 localities in Norfolk " : Geol. Mag., Dec. V, Vol. Ill, pp. 339-40, 1906. 



