135 
Genera of Semiparasitic Polyzoa. 
meat en faire uneespbce distincte.” Then, in a note, he adds, 
“ Depuis que ces lignes out ete dcrites, j’ai requ sur cette 
esphce un nouveau travail, que M. Yogt a eu l’obligeance de 
m’envoyer; il la decrit sous le nom de L. phascolosomatum \ 
j’ai supprime le nom qui je lui avais deja donne pour adopter 
ce dernier 
My object in writing this is to fully and finally rectify the 
mistake into which I had fallen. In 1861 Loxosoma had 
never been heard of, nor was any genus known at all like it; 
for the structure of Pedicellina is in many important points 
widely different. The peculiar position which these clavate 
bodies occupied, confined as they were to the caudal extremity 
of the Gephyrean, and the fact that they were so firmly at¬ 
tached to the host as to seem part of it, mainly conduced to 
the error. On this last point I may quote from Hincks’s 
abbreviated translation of Vogt:—“ As the Loxosomas are 
very firmly attached to the epidermis of the worm, it is almost 
impossible to remove them unmutilated. To observe them in 
situ , the extremity of the tail bearing the tuft of Polyzoa must 
be cut off with a pair of scissors and placed entire under the 
compressor.” Vogt’s drawings were made under the most 
favourable circumstances. u The author has made his obser¬ 
vations almost exclusively on living animals by means of 
transmitted light. Patience and abundance of material have 
been the conditions that have secured his results. All his 
figures have been taken with the camera from living animals, 
and finished as far as possible with the animal before him.” 
With these advantageous circumstances contrast the fact that 
I had only before me specimens which had been three years in 
a preservative medium, and consequently not only contracted 
and devoid of that motion absolutely essential to recognize 
parts in a hitherto unknown microscopic animal, but also that 
chemical changes had taken place in some of the organs. Let 
it also be borne in mind that a group of the animals is so 
small that Vogt says of it, u it forms a tuft hardly visible to 
the naked eye,” and, further, let it be noticed that Vogt’s 
drawings are more than double the scale of mine, and then let 
my figures 2 and 3 be compared with his, and the correspon¬ 
dence is certainly striking. His figure 2 and my figure 2 
might have been drawn from the same specimen ; not only the 
* It is only since Vogt described Loxosoma phascolosomatum that it has 
been possible to identity the species which I met with ; but Leuckart 
(Arcliiv fur Naturgesch. xx. 18(33, ii. 13d.), immediately after Keferstein 
had described the genus, pointed out that it seemed to have been pre¬ 
viously met with by myself; and Nitsche (Beitriige zur Kenntniss der 
Bryozoen, iii. Heft, 1876, p. 140) also calls attention to my figures as the 
first representations of this semiparasitic Polyzoou. 
