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DK. G. H. FOWLEE— BISCATAN PLANKTON 



Between the first two there is practically no difference, and hut little distinction can 

 he drawn between the last three. Although the separating characters are not the same 

 in the two generations, the gonozooids of the first two species similarly belong to one 

 group of gonozooids, those of the last three to another. 



Out of the numerous well-preserved blastozooids in the collection, not one had retained 

 on its dorsal outgrowth phorozooids of sufficient size to be identified specifically. The 

 experience of the ' National ' was similar ; the older buds become very easily detached. 

 It is only, therefore, through indirect evidence that the blastozooids and trophozooids can 

 be linked with their proper species. Such evidence I propose now to attempt. 



In 14 out of the 50 hauls at 100 fathoms or less which contained BoUoliim of any 

 kind, occurred either gonozooids or phorozooids, or both, referable to Tritonis, amounting 

 in all to 111 * gonozooids and 119 * phorozooids. In 2 out of these 50 hauls were 

 found gonozooids referable to Krolini ; in 1 only a gonozooid belonging to Nationalis. 

 Expressed in a comparative table, of the total gonozooids captured : 



97*3 per cent, were referable to Tritonis, 

 \-7 „ „ „ Krohni, 



•8 „ „ „ Nationalis ; 



and there occurred gonozooids of : 



Tritonis in 28 p.e. o£ hauls containing Doliolum, 

 Krohni in 4 „ „ „ 



Nationalis in 2 ,, „ „ 



In every one of the 50 hauls at 100 fathoms or less which contained Doliolum of any 

 kind occurred blastozooids, amounting to 922 sj)ecimens. In about sixteen of these 



* Actual numbers, not multiplied by time-factor ; all nets at 100 fm. or less. 



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