Pandalidae 231 



Family ligydidak 



NOTE ON BLEEPING LIGIA OCEANIC A IX THE LABORATORY 



John Tait, McGill University 



KEEP animals in the darkness in a closed biscuit tin (of the English 

 kind) the walls of which are lined with cardboard. Moisten the 

 walls with freshwater or diluted seawater ( 1 part seawater to 3 parts of 

 freshwater;. Give them a good foothold: do not keep them on glass. 

 Clean the tin every four or five days by washing it out with seawater. 

 Yarious kinds of animal and vegetable food were tried; the best results 

 were obtained with blades of Laminaria. 



Bibliography 



Tait, J. Experiments on immersion of Ligia. Quart. J. Exper. Physiol. ,3:1. 



r- 191 7. Experiments and observations on Crustaceae. Pt. 1. Immersion 



experiments on Ligia. Proc. Royal Soc. Edin. 38:50. 



1925. The Sea-Slater, Ligia oceanica; a study in adaptation to habitat. 



The Scottish Naturalist. 151:13-18; 152:49-55. 



Order decapoda, Famih' pandalidae 



HATCHING ANT) REARING PANDALID LARYAE 

 At.freda Berkeley Xeedler, Biological Board of Canada 



THE five Pacific coast species under consideration are Pandalus 

 danae, P. borealis, P. hypsinotus, P. platyceros, and Pandalopsis 

 dtspar. All of these species lay their eggs in the autumn, carry them over 

 winter, and hatch them in the spring. The hatching begins about the 

 end of February and continues until the end of May, being at its height 

 about the beginning of April. 



Towards the end of February, therefore, five tanks were set up in 

 the basement of the Biological Station. The tanks were made with 

 wooden ends and bottoms and plate glass sides, and were about 2 feet 

 long, 15 inches wide, and 18 inches deep. The wood and joints were 

 covered with black asphalt paint such as is commonly used in hatcheries. 

 The outlets led into beakers covered with muslin so that the larvae 

 when hatched could not escape. The water came from a large concrete 

 tank above the station and about 10 years old, which was daily pumped 

 full of seawater from near the end of the station wharf. In previous ex- 

 periments it had been found that this water often contained a fine brown 

 debris which clogged the shrimps" gills and killed them. Partly to 



