HYDI?OZOA AND CTENOPHORA. 
Gael. 2 
5. CiAMlCiAN, J. Ueber den feineien Ban mid die Enfcwickelnng von 
Tuhularia mesemhriianthemuni,A\\m. Z. iviss.Zool.xxxii. pp. 323-347, 
2 pla. 
The development takes place in the gonophore ; segmentation is 
irregular, and leads to the formation of an epibolic gastrula, four large 
central cells constituting the hypoblast. Balfour and Kleinenberg have 
failed to detect an epibolic gastrula, or any such irregularity as Ciamician 
describes. The larva is hatched in the form known as Actinula, and 
soon becomes fixed by the ab-oral end, and forms a colony. 
6. Clarke, S. F. Report on the Hydroida collected under the super- 
vision of Prof. Al. Agassiz during the exploration of the Gulf Streaii 
and Gulf of Mexico. Bull. Mus. C. Z. v. No. 10, pp. 239-252. 
Three species of Gymnohlastea were found, 2 of which are new ; 23 
species of Calypiohlastea, 8 of which are new, and 1 belongs to an inte- 
resting new genus, NematopJiorus. 
7. Claus, C. Agahnopsis vtricularia, sp. n. Eine neue Siphonophore 
des Mittelmeers. Arb. z. Inst. Wien, ii, pp. 199-202, pi. 
There are large vesicles at the extremities of the nematophores — 
hydrostatic in function — beset at the base with eight stinging threads, 
which are well developed. These appear to be only modifications of 
similar structures found in A. sarsi. 
8. Du Plessis, G. Etude sur la Cosmetira salinarum, sp. n. Nouvelle 
M^duse paludicole des environs de Cette. Bull. Soc. Vaud. (2) xvi. 
[ pp. 39-45, pi. ; r/. also Ann. N. H. (5) iii. pp. 385-389. 
Du Plessis found this form in June, 187G, in the discharging canal of 
the salt works at Villeroy, near Cette, clinging to the under surface of 
floating Algce, The canal is narrow and shallow, and the bottom con- 
sists of black putrid mud. The water becomes very hot from the sun, 
and sometimes exceeds 77° F. It is only found in June and July. 
9. Eimer, J. Versuche iiber kunstliche Theilbarkeit von Beroe ovatiis, 
angestellt zum Zweck der Controls seiner morphologischen Befunde 
iiber das Nerveusystem dieses Thieres. Arch. mikr. Anat. xvii. 
pp. 213-240. 
Eimer shows that there is no distinctly localized central nervous system 
in Beroe. The nerve-cells, which may be functional centres, are scattered 
over the whole body, but are more closely aggregated at the anal pole. 
He gives two sets of experiments. The first set consisted of a transverse 
division of the Beroe into three segments ; all movements of the swim- 
ming plates stopped, but soon reappeared in the anal segment, and, after 
some interval, in the others. .Afterwards, small pieces were cut off, and 
in all, movements occurred after the shock had passed away. In the 
second set of experiments, a row of swimming plates was excised, and 
the anal portion of this was cut off ; all movements ceased, but gradu- 
ally reappeared, commencing with the anal end, the movements having 
the same direction as in the uninjured animal. 
