Ocel, 1 
C(ELENTERATA. 
Hydrozoa and CtenophorAj by Alfred Gibbs Bourne, 
B.So. (Bond.), &c. 
Anthozoa, by Sydney J. Hickson, B.Sc. (Lond.), B.A,, &c. 
HYDROZOA AND CTENOPHORA. 
1. Allman, G. R. On the Development of the Ctenophora. Abstr. in 
Zool. (3) V. pp. 342-342. 
A review of the work of Agassiz and Chun. 
2. Bedot, M. Sur la faune des Siphonophores du Golfe de Naples. 
MT, z. Stat. Neap. iii. pp. 121-123. 
The Bay of Naples presents 1 9 species of Siphonophora, representing all 
the families of the Order. 
3. Blaschka, R. Ueber Hydroidquallen oder Craspedoten. SB. Ges. 
Isis, 1880, pp. 45-49. 
4. Brass, A. Untersuchungen der Histologie von Hydra (yiridis). 
Z. ges. Naturw. liii. [1880] p. 911. 
5. Chun, C. Die Natur und Wirkungweise, der Nesselzellen bei 
Ccelenteraten. Zool. Anz. iv. pp. 649 & 660. 
The author shows that the nematocysts (thread-cells) have muscles 
connected with them, and that it is the contraction of these muscles 
which, increasing the fluid pressure within the sac, causes the extension of 
the filament. These muscles are most obvious in Physalia. where they 
are perfectly regularly arranged, and in this genus small unipolar and 
bipolar ganglion cells have been seen, and sensory hairs (palpocils) are 
found in large numbers in the neighbourhood of the groups of nemato- 
cysts. The author considers the nematocysts to represent morphologically 
epithelio-muscular cells. 
6. . Das Nerveusystem der Siphouophoreu. L. c. pp. 107-111. 
The author adds to our knowledge of the nervous system in the 
Coilenterata by describing that of the Velellidce. 
7. Claus, C. Beitrage zur Kentniss des Geryonopsiden- und Eucopiden 
Entwickelung. ^ Arb. z. Inst. Wien, iv. pp. 89-120, 4 pis. 
