BRIGHTWELL, ON NOCTILUCtE. 
187 
ing of the Noctilucse without detecting double forms among 
them^ and in some they were abundant. 
A general idea of the process of division will best be ob- 
tained by the figures we have given_, showing the commence- 
ment and gradual formation of a double form^, and the ulti- 
mate disruption into two separate individuals. See PI. xii^ 
figs. 5, 6j 1 , 8, 9. 
Colonel Baddeley's observations lead him to infer that 
this process begins by the gradual formation of a second 
nucleus, which^ after its commencement^ rapidly arrives at 
the size and appearance of the other. A second globular 
substance^ also^ (termed^ by some previous writers on the 
subject_, the mouth), is formed in addition and near to the 
nucleus^ and a constriction^ small at firsts but gradually in- 
creasing_, takes place^ until the perfect Noctilucse are deve- 
loped^ united at last by a thin band_, which is speedily ruptured. 
The whole process seems to be accomplished in a few days. 
In a gathering made the 7th of March last^ numerous double 
specimens were observed. On the 13th of the same month, 
only two double specimens could be found_, held together by 
a slight band ; and from that time to the 27th no double 
specimens could be detected.^ 
It will be seen that Krohn, (admitted by Mr. Huxley to 
be a most excellent and accurate observer) states that tJie 
division of the body is preceded by that of the nucleus ; and 
it is a strong confirmation of this statement, that Colonel 
Baddeley, from his own observations only^ should have come 
to the same conclusion. 
Colonel Baddeley^s remarks on the general structure of 
these animals, the nucleus, mouth, tooth, cilium, and gastric 
pouches^ agree with those of previous observers as detailed 
in Mr. Huxley^s excellent paper, and they need not be repeated 
here. Colonel Baddeley observes that scarcely any two indi- 
viduals are exactly alike, some having the vacuoles and small 
oiUlike globules distributed through their substance, while 
others have nothing of the kind. He has seen portions of 
the oil-like globules mixed with fluid pass out below the oral 
opening, as if through an anal one. Many individuals are 
also found destitute of the remarkable organ called the tail. 
The observations of Dr. Busch (see vol. iii, ^ Micr. 
Journ.,^ p. 203), and particularly those of Mr. Gosse (see 
his ^Rambles on the Devonshire Coast,^ p. 257), clearly demon- 
strate that the Noctilucse increase also by germs or gemmse. 
Colonel Baddeley^ s observations have not led to the detec- 
^ * Colonel Baddeley has since satisfied himself that the whole process of 
division does not occupy more than twelve hours. 
