148 Victorian Polyzoa, 



Suborder II. CYCLOSTOMATA, Bush. 



Family 1. CRISITD^E. 



Genus 1. Crisia, Lamouroux. 



1. C. acropora, Busk. 



2. C. setosa, McG. 



3. C. Edwardsiana, UOrbigny. 



4. C. biciliata, McG. 



Family 2. IDMONEID^E. 



Genus 1. Hornera, Lamouroux. 



1. H. foliacea, McG. 

 Genus 2. Idmonea, Lamouroux. 



1. I. radians, Milne Edwards. 



Family 3. DIASTOPOEIDJG. 

 Genus 1. Discoporella, Gray. 



1. D. hispida, Johnston, sp. 



Suborder III. CTENOSTOMATA, Bush. 

 Family 1. SERIALARIIME. 



Genus 1. Serialaria, Lamarck. 



1. S. cornuta, Lamx, s 



2. S. crispa, Lamarck. 



Art. XXII. — A Sketch of a New Theory of the Oceanic 

 Tides, based upon examination of the causes assigned 

 to exceptional " tidal " waves. By Mr. J. Wood 

 Beilby. 



[Read by Mr. Rawlings, 26th November, 1868.] 

 In this paper Mr. Beilby sought to demonstrate that the 

 earth's surface was liable to regular changes by the relative 

 elevation or depression of areas of sea surface in the northern 

 and southern hemispheres, disproportionately, as ascertained 

 by barometrical observations, and that redundance of matter 

 thus unequally accumulated with excessive local precipitation 

 and congelation in areas within polar regions, must tend to 

 alter the symmetrical figure, and hence the centre of gravity 

 and axis of rotation of a spheriod poised in space, and 

 relatively change the position of her equator with reference 

 to the plane of her orbit ; thus accomplishing by terrestial 

 agencies, results hitherto ascribed to lunar and solar gravita- 

 tion. 



