Notices of New Books. 4983 



'Description of a New Species of Clausilia from the neighbourhood 

 of Cheltenham.' By A. Schmidt. 



6 Memoir on the Indian Species of Shrews.' By Edward Blyth, Esq. 

 With Notes by Robert F. Tomes, Esq. 



1 On the Mechanism of Aquatic Respiration, and on the Structure 

 of the Organs of Breathing in Invertebrate Animals.' By Thomas 

 Williams, M.D. Lond. 



f On the Origin of the Geographical Distribution of Crustacea.' By 

 James D. Dana. [Extracted from Silliman's Journal.] 



' On Anthracosia, a Fossil Genus of the Family Unionidae.' By 

 William King, Professor of Mineralogy and Geology in Queen's 

 College, Galway. 



' On the Genus Assiminia.' 



Bibliographical Notices : — Recherches sur les Crinoides du Ter- 

 rain Carbonifere de la Belgique; par L. de Koninck et H. le Hon. 

 A Lecture on the Geological History of Newbury, Berks ; by T. Rupert 

 Jones, F.G.S. 



Proceedings of Societies : — Zoological, Botanical of Edinburgh. 



Miscellaneous: — Observations on the Blistering Beetles of the 

 Neighbourhood of Monte Video ; by M. A. Courbon [extracted from 

 the Comptes Rendus, December 3, 1855, p. 1003]. Unusual Dearth 

 of Algae in 1855 ; by John Cocks. Observations on Echini perforating 

 the Granite of Brittany ; by M. Valenciennes [extracted from the 

 Comptes Rendus, November 5, 1855, p. 755]. New Species of 

 Mammals and Birds ; by M. Eversmann [extracted from the Bul- 

 letin de la Societe Imperiale des Naturalistes de Moscou, 1853]. 

 Description of a New Bird from Guatemala, forming the Type of a 

 New Genus ; by John Gould, F.R.S., &c. The late Mr. Newport. 



Mr. Clark's observations show that the young, or perhaps more 

 properly ova, of Chiton are discharged continuously for about fifteen 

 minutes, at the rate of one or two every second : they were of a pale 

 yellow colour and subglobular form, and appeared invested with, and 

 connected by, a viscous substance discharged simultaneously with the 

 ova ; for two days they were quiescent ; on the third day they emerged 

 from their investment and swam rapidly about the saucer; at this 

 early date they seemed to possess very nearly the figure of the parents : 

 on the twenty -ninth and thirtieth days all natatory motion ceased. 



The Clausilia noticed by Professor Schmidt as having occurred at 

 Cheltenham is the C. Mortilleti of Dumont, published in 1853 in the 

 ' Bulletin de la Societe d'Histoire Naturelle de Savoie,' p. 78. It is 

 said to be at once distinguishable from all those forms which are so 

 closely allied both to C. ventricosa, C. lineolata and C. plicatula by 



