VKRMEP. 
41P 
VERMES 
BY 
C. F. Lutken, Ph.D., F.R.D.A., &c. 
I. ROTATORIA. 
1. Hudson, C. T. On Vedalion mira. O. J. Micr. Sci. xii. 
pp. BBS-SSS, pi. 19. 
2. Lankester, E. Ray. Remarks on Pedalion. Ibid. pp. 338- 
342.- 
3. Marion, M. A. F. Rotateurs parasites des Nebalies. C. R. 
Ixxiv. p. 1115. 
4. Salensky, W. Beitrage zur Entwickelungsgescliichte desRrrt- 
chionus urceolaris, Z. wiss. Zool. xxii. pp. 455-466, pi. 38. 
5. Semper, C. Zoologisclie Apliorismen. III. TrochospJusra 
cnquatorialis j das Kugelradertliier der Philippinen. Ibid, 
pp. 311-322, pi. 24. 
Salensky’s paper (4) is important, as contributing the first illustration of 
the evolution of a Rotatorian and its external and internal organs. Of the 
first two cleavage-cells of the egg, the smaller builds up the external, and 
the greater the internal cellular layer of the embryo. From the first of these 
the foot, velum, shell, nerve-ganglion, and armed pharynx are formed, 
from the second the other internal organs ; the muscles originate Irom an 
intermediate layer, making its appearance at a rather late period. The first 
stages of the male embryo correspond entirely with those of the female, but 
in the place of the other internal organs only a gigantic icsiw and the ‘‘ pri- 
mordial kidney ” are developed from the endoblast. 
Hudson (1) figures the remarkable new Rotifer Pedalion (female), with 
a circle of six movable, but non-articulate, feathered “ limbs ” ; also the 
much reduced male and the strongly transversely striated muscular system. 
Lankester (2) speculates ingeniously on the part possibly played by this 
type in the developmental series leading from Annulata to Arthropoda, 
pointing out the (rather slight) analogies between the limbs in Pedalion, the 
arms in the male Asplanchna, and the movable spines of Polyarthra and 
Triarihra. 
Marion (3) announces the discovery of a new par.asitic Rotatoiian oi the 
