566 L. R. CRAWSHAY. 



temperature, five experiments (January ISth to 29th) showed the following 

 results up to the time when the observations were interrupted : — 



Ko. Date. Specimens, Adults. Reniark.s. 



195 Jan. 13th 3 All living on ]2tli day TMany Nanplii seen be- 



(and apparently on -J tween 6th and 26th 

 26th day). ( days. 



{One Nauplins on 4th 

 day. None seen on 

 20th day. 



200 „ 24th 3 Two „ „ 16th day. |^"^*^^^^gS ^^^^ «^ ^^'^^ 



! Water infected by Bac- 

 teria forming long 

 white strands. 



n„T or,.-! o rr T • o, ,n 1 r About 7 ova seen on 



202 „ 29th 3 Two living on 3Uth day. < ,.,, i 



Omitting the experiment which failed through bacterial infection, the 

 mortality was small at the time when the observations were interrupted, 

 two deaths only having been recorded among the twelve specimens over 

 a period averaging at least 20 days and probably 23 days, in the different 

 experiments. 



Ova were obtained in all these experiments, and nauplii were recorded 

 in two of them, many .occurring in one over a period of 20 days. 



Acartia sp.* In a 1-litre flask, submerged in the artificially heated 

 bath, a single experiment was made (December 20th) with 5 specimens. 

 On the 40th day three of these were living. Nauplii were first observed 

 on the 23rd day, about a dozen were seen on the 25th and 32nd days, 

 and a few only on the 40th day. 



A Comparison of the Results obtained in Position C with those obtained 

 in Positions A and B. 



The experiments with Pseudocalanus having all been made in Posi- 

 tion C, the results obtained with this species must be treated with some 

 reserve when comparing them with those obtained for other species in 

 Positions A and B, and it is better to consider them only as confirming 

 the evidence of the experiments with Calanus and the single experiment 

 with Acartia. 



For Acartia, the only experiment in Position A gave the high maxi- 

 mum of 100 days, and an average of 60 days for the 6 specimens. In 

 the uncompleted experiment in Position C, 3 out of the 5 specimens 

 were still living on the 40th day. The combined life period of the young 



* Probably A. Clausi. The species was not certainly determined. 



