884 General Notes. [August, 
Concerning the earliest phases of development of Peripatus, 
which had not been treated of by Moseley, Balfour left some 
drawings and sections, which, with other sections made from 
material which he left, are worked out by Moseley and Sedgwick. 
In a letter to Professor Kleinenberg he described the blastopore 
as an elongated slit-like structure extending along nearly the 
whole ventral surface; and further states, as the result of his ex- 
amination of the few and ill-preserved embryos in his possession, 
that the mesoblast appears to originate as paired outgrowths from 
the lips of the blastopore. 
The editors thus briefly summarize the more important facts of 
the early development of Peripatus : 
1. The greater part of the mesoblast is developed from the 
walls of the archenteron. 
2. The embryonic mouth and anus are derived from the respec- 
tive ends of the original blastopore, the middle part of the blas- 
topore closing up. 
3. The embryonic mouth almost certainly becomes the adult 
anus is in front of the position of the adult anus, but in all proba- 
bility shifts back, and persists as in the adult anus. 
4. The anterior pair of mesoblastic somites gives rise aes 
swellings of the preoral lobes and to the mesoblast of the he i 
Peripatus is indeed a remarkable type. Agreeing wi 
lower worms in its pharynx, and especially its widely pl me 
nerve cords, and with the annelids in its segmental organs; y is 
trachee and the mode of its early embryonic developers 
without doubt an Arthropod. As Balfour has stated, rats ji 
embryo has procephalic lobes, and a glance at May bal 
(Balfour’s Comparative Embryology, Fig. 169) shows cone +. te 
kingdom. 
m Pro- 
cestral nature.—A. S, P. 
Tue DEVELOPMENT or Renitta.—An abstract of 
Wilson’s researches on the development of Renilla, 2 
studying the mode of origin of the buds, he shows (“ haupt- 
zodid”) is formed at an early stage as a median u ; 
axial polyp, its function being to discharge water ri action 
r by the a 
of the sex- 
TE ee A a a en ENAS 
