Crustacea. 4701 



June 19th, one 



cast skin 



was removed. 



„ 2lst, one 



n 



» 



„ 26th, one 



»> 



» 



„ 27th, one 



>» 



„ 



„ 28th, one 



» 



» 



„ 29th, one 



•>■> 



>» 



July 4th, one 



» 



»j 



„ 9th, one 



»» 



>» 



„ 11th, one 



» 



j> 



At this date four individuals were given to a friend, so that the 

 number was reduced to four. 



July 15th, one cast skin was removed. 

 „ 17th, one „ „ 



„ 18th, one „ „ 



„ 21st, one „ „ 



„ 30th, one „ „ 



August 3rd, one „ „ 



„ 4th, two cast skins were removed. 

 „ 12th, one of the prawns died during the moulting. 

 „ 14th, one cast skin was removed from the aquarium. 

 „ 21st, one „ „ „ 



September 2nd, one „ „ „ 



So that the period appears to vary from twelve to twenty-four days. 

 This variation may depend upon the quantity of food taken by the 

 respective individuals, and also on the varying temperature of the 

 aquarium, which, from its small capacity and other circumstances, is 

 very liable to be readily affected by the heat of the sun through the 

 day, and the effects of radiation during a clear night. I may mention 

 that, if these cast skins are not removed from the water, the prawns 

 will devour all the smaller and softer parts, as the legs, the palpi, and 

 the false or swimming feet, with great rapidity. 



I hope in a future communication to add several observations on 

 other varieties of the Palsemonidae. 



Robert Warington. 



Apothecaries' Hall, Blackfriars, 

 March 12, 1855. 



A Record of some of the Effects of the late Severe Weather on Animals. — It is the 



opinion of Mr. Bell (Br. Quad. p. 306) that the longtailed field-mouse of English 



authors is the species which Ray terms Mus domesticus medius ; but no reason is 



assigned why it should be called a domestic mouse. The late cold weather, however, 



XIII. Z 



