i 
TROPICAL PLANKTON. 267 
By a mere coincidence, each collection consists of 23 
bottles of material, the preservative fluid in both being a 
weak (5 % from the 40 %) solution of formol. Besides the 
excellent preservative properties of formol, its portability 
is a great consideration, the 5 % solution being prepared 
as required with sea-water. It also often saves the annoy- 
ing examination and duty frequently exacted by custom- 
house officers if alcohol be used as a preservative. 
The actual amount of plankton collected was, in both 
eases, small—Capt. Wyse’s bottles each contained from 
4 to 1lcc., and Mr. G. W. Herdman’s less than half that 
quantity. Any lack of quantity was, however, made up to 
quality, the former collection especially proving very rich 
in species; but it is more than probable that more material 
would have resulted in many more species of animals. 
Biologists, and all who are interested in the science of 
Oceanography, are much indebted to both gentlemen for 
the trouble they have taken in making the collections, and 
for the care exercised in keeping exact records of locality 
and in preserving the material. | 
As might be expected, Copepoda constituted almost the 
entire bulk—70 species occurring in Capt. Wyse’s collec- 
tion, and 39 in Mr. G. W. Herdman’s. In the former the 
Copepoda are distributed in the families, as follows, 
V1Z. :-— 
Calanidee ae ih 17 species. 
Centropagide ... bi Sh kde 
Candaciidee a be AES 
Pontellidee a be Ova a vis 
Cyclopide TA 
Harpacticidee Gites 
Corycoeidee fu Bd 23 
