10 EDWARD T. BROWNE. 
The occurrence of Periphylla at the surface in the Antarctic tends to show that 
the “ deep-sea” Medusz are lovers of cold water, or, at all events, flourish best at a 
cool temperature. Ifthe temperature of the water fixes their bathymetrical distribu- 
tion, then we can account for their keeping below the warm water zones in the tropical 
and temperate regions. I agree with Bigelow that the term “ deep-sea” had better be 
abandoned, as it is only misleading, especially as the ‘ Albatross’ obtained the majority 
of the deep-sea genera within 300 fms. of the surface where the temperature was 
above 42°7° F. 
Anatomical Results.—In the Hydromedusan genus Koellikeria I have found the 
interior of the stomach covered with minute endodermal papille. Whether these 
papillz have the same function as the gastric filaments of the Scyphomeduse remains 
to be found out. In the Antarctic species of this genus there are radial grooves in the 
wall of the sub-umbrella, adjacent to the radial canals. The grooves are lined with 
columnar ectoderm cells, and evidently from their appearance have a definite function. 
The Mediterranean species (K. fascicularis) has not got these grooves. 
The new species of Stbogita has its stomach completely converted into a repro- 
ductive organ when the gonads attain their full development. The stomach then 
ceases to function as stomach, and its cavity is filled with endoderm. The gonads are 
apparently in ectodermal pouches which are embedded in the endoderm, and the 
pouches have openings to the exterior for the discharge of their contents. 
Classification.—The revisions of the old genera and sub-families and the addition 
of new genera which have come to light during recent years are gradually changing 
the system of classification as laid down by Prof. Haeckel. Although improvements 
have been made in some sub-families or groups, others still remain practically in their 
old condition, mainly through the want of fresh material to work upon. 
By means of a new species of Catablema in the Antarctic collections I have 
endeavoured to show that the family Cladonemide is no longer required. The chief 
character which linked together the genera of this family is based upon the tentacles 
having branches, or filaments, or stalked nematocysts. It has resulted in the bringing 
together of a number of genera which have no true relationship with one another. The 
character selected for the family is more suitable for a generic or even a specific 
character. It is easy to abolish a family and to scatter the genera, but it is very 
difficult at the present time to assign new places for them, as this involves revision of 
other families or sub-families. 
A new genus (Cosmetirella) of Leptomeduse with open sensory pits led me to 
examine other genera with similar organs, and I have collected them together under 
the name of Mitrocomide, and have defined the genera. 
A new species of the Margelide raised difficulties over the old genus Rathkea. 
As a revision of the species could not be satisfactorily accomplished without the use of 
another generic name, I considered it is best to revive the generic name Koellikeria of 
Agassiz, and thus to obtain a good type species. 
