98 



DR. G. H. FOWLER— BISCATAN PLANKTOX 



agree together ; and I incline to doubt that they are really of the same species: in the 

 synoptic table below * I have kept them separate from one another : — 



behind stomach. 



These Trophozooids A, Avhich I refer provisionally to Tritonis, differ in one point or 

 another from all those yet descriljed, notably and from all in the fact that the whole 

 alimentary canal is tightly compressed together, almost like a Salpa " nucleus." Many 

 of the specimens were in very good condition, and the points of difference are therefore 

 not likely to be due to preservation. 



As regards the scale-like projections figured by both Grobben and Uljanin, some of my specimens had 

 two, some one, some none. It is probable that they belong rather to the dorsal outgrowth of the 

 blastozooid than to the trophozooid, and that their presence, like the lengtli of the stalk, depends on 

 liow and wiiere the trophozooid is broken off. The specimen in PI. 8. fig. 2 had no scale, that in fig. 3 

 siiowcd two, folded over : they react to liiematoxylin like the test. The long sense-processes figured by 

 Grobben had generally been knocked ofi", but were observed in some specimens. 



Trophozooid B. (PL 8. figs. 4, 5.) 



In 3 out of the 50 hauls between 100 fathoms and the surface occurred trophozooids 

 of another character — in all four specimens. In only one of these hauls was there 

 caught a blastozooid f not obviously like Blastozooid A ; this has already been mentioned 

 in Blastozooid E (p. 97). 



* As with the blastozooid, the authority for the description and figure has been enclosed in square brackets. 



t Of course, the presence of these trophozooids, although only 3'6 p.e. of the total number, renders less assured 

 my reference to Tritonis of all the 917 blastozooids quoted as A. But if this reference be not accepted, the non- 

 degenerate specimens can be quoted simply as Blastozooid A, the rest over 3 mm. left doubtful ; and the remarks 

 about swarming, reaction to rain, optimal horizon, &c., can be taken to refer to blastozooids as a whole irrespective 

 of species, since they omit only 5 specimens. 



