202 REPORT ON ZOOLOGY, MDCCCXLIII. 



should have been oscillating backwards and forwards. I am unable, conse- 

 quently, to participate in the author's view with respect to this organ. 



Rathke's ( Beitrage zur Fauna Norwegens' (Act. Leopold. 

 xx Bel. 1 Th.) are of importance as regards a knowlege of 

 the Crustacea. The individual new ones will be mentioned 

 particularly below. 



Thompson (Ann. Nat. Hist, xi, p. 102) has continued his 

 enumeration of the Irish Crustacea. 



Die Siidafrikanischen Crustaceen, eine Zusammenstellung 

 aller bekannten Malacostraca, Bemerkungen iiber dereii 

 Lebensweise und geographische Verbreituug, nebst Beschrei- 

 bung und Abbildung mehrerer neuen Arten, von Dr. 

 Ferd. Krauss. Stuttgart, 1843, mit 4, lith. Taf. (The 

 South African Crustacea, a collection of all the known Ma- 

 lacostraca; remarks upon their habits and geographical 

 distribution, together with descriptions and figures of several 

 new species, &c. &c.) 



A meritorious work, and especially valuable on account of the interesting 

 remarks which the author makes in accordance with his own observation of 

 the conditions under which they are found, and of the habits of the South 

 African Crustacea. The new species will be mentioned below. 



The arrangement of the South American Crustacea iu D'Orbiguy's Travels, 

 by Milue Edwards, and Lucas, has appeared iu part in 1813, but was not 

 concluded before 1S44. I therefore reserve a notice of this work for the 

 next Report. 



DECAPODA. Joly has furnished a contribution of very 

 great importance, on the development of the Decapoda. 

 (Ann. d. Scienc. Nat. xix, p. 34, t. 3, 4.) ' Etudes sur les 

 Moeurs, le Developpement, et les Metamorphoses d'une petite 

 Salicoque d'eau douce (Caridina Desmarestii], suivies de 

 quelques reflexions sur les metamorphoses des Crustacees 

 Decapodes en general.' 



Mention of this work was made in the last year's Report, p. 272, from the 

 notices iu the French journals. The memoir itself gives much more than \\ as 

 there promised. The species on which the observations were made, and which 

 inhabits fresh water, in France, is Hii>i>ulyle Desmarestii, Millet, of which the 

 author shows that it belongs more properly to the genus Caridina, Edwards, 

 on which account he culls i< Car. Desmareslii. The development of the 



