80 
receptaculum semiuis, and then passes to one side of 
it. In specimens of G. aquations and G. subbifurcus 
the receptaculum seminis was found to contain abundant 
sperma, and to occupy almost the whole of the section. 
The internal organs are separated by abundant, perien- 
teric, cellular tissue. Iu male specimens of G. aquations 
and G. subbifurcus , Dr. Grenacher found at the extre- 
mity of the tail a wide flask-shaped cloaca, placed at right 
angles to the long axis of the body. At the posterior wall 
of this were three openings — one, the intestinal orifice, 
placed superiorly and iu the median line, and the remaining 
two, which formed the external openings of the vasa defe- 
rentia, placed interiorly and on either side. 
Dr. Grenacher, in his conclusions concerning the much- 
disputed point of an oral orifice in these creatures, states 
that so long as the Gordius is parasitic there is a distinct 
mouth iu direct communication with the intestinal canal ; 
but when the parasite has passed from the body of its host 
and commences a free life, the mouth is more or less oblite- 
rated. Sometimes a trace can be discerned of this opening, 
sometimes it is altogether absent ; the anterior portion of 
the intestines at the same time undergoes atrophy, and its 
place is occupied by cellular tissue. 
Noctiluca miliaris. By Dr. Donitz. 1 plate. Reich, u. 
ReymoncTs Archiv, 2nd part, 1868. 
On Noctiluca milaris, Sur. By J. Victor Carus. 2 
pages. Max Schultze’s Archiv, 1868, 3rd part. 
in No. 2, says Dr. Carus, of the ‘Archiv fur Anatomie, 
Physiologie/ &c., by Reichert and Revmond which, although 
published in May, has only just come into my hands, there 
is a paper by Dr. W. Donitz, on Noctiluca. Dr. Donitz has 
mentioned on page 145 that he has discovered an inexplic- 
able error in that part of the ‘ Manual of Zoology ’ which 
has been written by me. It is that I have described in the 
diagnosis of Noctiluca a gelatinous parenchyma, as com- 
parable to the mucous tissue of the higher animals. Thank- 
ful as I am to have my errors corrected (for I know my works 
are no more free from them than those of Dr. Donitz are), I 
must, however, repudiate statements such as are made 
in the remarks of Dr. Donitz. I say, in page 568 of the 
‘Manual/ “The ‘ parenchyma * of the body (of Noctiluca), 
which shows no contractile bubbles, consists of a homoge- 
neous glutinous substance, through which numbers of nume- 
rously ramified fine ‘ parenchyma strings ’ reach like a skele- 
ton from the nucleus and the stomach towards the circum- 
ference, on which arc found small bodies, enlarging towards 
