No.415.] .VORTH-AMERICAN INVERTEBRATES. 595 
m 
CYSTONECTÆ. With large vesicular pneumatophore only, no necto- 
phores or bracts. 
Physalia pelagica Bosc. Common along the coast, occasionally 
taken at the Bay of Fundy. The well-known Portuguese-man-of- 
war. One of the most conspicuous of the siphonophores, and with 
long graceful tentacles which are loaded with batteries of nemato- 
cysts of highly venomous character. 
In the foregoing synopsis only incidental notice has been made of 
synonomy, any details on this line being incompatible with the purpose 
and limits of the paper. 
It is a pleasure to acknowledge in this connection my obligations to 
Dr. Alfred G. Mayer, of the Brooklyn Institute, who has kindly reviewed 
the manuscript of Part III of this synopsis, and offered suggestions, and 
from whose various recent papers on Medusa I have been able to extend 
the list of species in several cases. 
I desire also to acknowledge the services of my son George, who has 
copied most of the figures and has under my direction drawn most of those 
made directly from nature. 
BIBLIOGRAPHY. 
The following bibliographical references, in addition to those cited in the 
introductory paragraph, may also be a convenience to those concerned. 
BRONN. Klassen u. Ordnungen d. Thierreichs. Bd. ii. 1860. 
CHUN. Klassen u. Ordnungen d. Thierreichs. 7 progress. 
Brooks, W. K. The Life History of North-American Hydromedusze. 
ALLMAN, J. G. Report on the Hydroida of the Gulf Stream. 1877. 
ALLMAN, J.G. Report of Hydroida of Challenger Expedition. 
Forges, Epw. British Naked-Eyed Medusæ. 
HERTWIG, R. AND O. Ueber das Nervensystem u. die Sinnesorgane 
der Medusen. 1877. 
KOLLIKER, A. Icones Histologice. 
McCrapy, J. Gymnophthalmata of Charleston Harbor. 1859. 
Nurtine, C. C. Monograph of American Plumularidz. 1900. 
LENDENFELD, R. v. Australia Hydromeduse. Proc. Linn. Soc., New 
South Wales. Vol. ix. 
Mayer, A. G. Bull. Mus. Comp. Zoól. Vols. xxv, No. t1 ; xxxii, 
OS. 2, 9 ; xxxvii, Nos. 1, 2. 
STIMPSON. Invertebrates of Grand Manan. 
CONTRIBUTIONS FROM THE ZOOLOGICAL 
LABORATORY OF SYRACUSE UNIVERSITY, February, 1901. 
