NAREATIVE OF THE CRUISE. 
937 
numbers at the surface of the sea after calm weather. It has often been mistaken for 
Noctilueh. 1 
Fig. 337.— Pyrocyms noctilUca, Murray; 100 times the natural size. 
“ A second species, Pyrocystis fusiformis, is represented in fig. 338. It is not nearly so 
abundant as Pyrocystis noctiluca, but is nearly always present with it, and has the same 
Fig. 338 . — Pyrocystis fusiformis, Murray ; 100 times the natural size. 
1 Prof. Langerhans says : — “ Pyrocystis noctiluca is observed on the surface in the Bay of Funchal all the year 
round. From September to December many are in simple division. Having seen your drawings with the interval 
between inner ball and external capsule, I do not doubt for a moment the identity of the forms observed by us. In 
case you have not finished your Report you will oblige by mentioning its occurrence here, as I do not see the necessity 
for writing about it specially. I have never seen Noctiluca itself here ,” — Letter to Mr, Murray. 
