Notes on Meduse of the Western Atlantic. 13,7 
tacles transparent, except for pattern of opaque white markings caused by 
parasitic protozoa. 
Habitat.—Very limited ; not found, so far as recorded, outside the moat of 
Fort Jefferson, Tortugas Islands, except, perhaps, in a single case. (A speci- 
men of Cladonema was taken by Dr. C. O. Whitman in 1883 on the shoals 
near Fleming’s Key, north of Key West, Florida. This was described by 
Fewkes,' and from the similarity between this specimen and our species in 
point of arrangement of canals it is not at all unlikely that it may be the 
same. The other points of anatomy are not so clear, and there are no 
figures.) Living in shallow water, close to the bottom, amongst tangled 
masses of filamentous alge. 
II. THE HYDROID' STAGE: 
CLADONEMA Hincks.* British Hydroid Zoophytes, 1868. 
STauripIuM Dujardin. Ann. des Sci., 1843. 
Generic characters—Minute Stauridium-like hydroid arising from a 
creeping stolon attached to alga, stone, or other supporting substance. I[n- 
vested by a perisarc. Hydranth club-shaped, tapering from above down- 
ward. Oral extremity rounded into a hypostome. Two series or verticils 
of tentacles, a capitate set at the oral end, four in number, forming a cross, 
thickly set with nematocysts; at a distance down the column a second ver- 
ticil of four stiff, rod-like tentacles, set opposite the angles between the 
upper set. 
Cladonema mayeri, new species. 
Specific characters—There does not appear to be any great difference be- 
tween the various species of Cladonema, in the hydroid stage. Its consti- 
tution is so simple in comparison with that of the rather complicated medusa 
form that it is not surprising to find fewer points of contrast between 
representatives of different species. Like Stauridium, Coryne, and Clava- 
tella, this genus offers a direct contrast to such hydrozoa as Obelia, in which 
it is hard to recognize any differences between gonosomes which develop 
upon trophosomes of very distinct character. The minute proportions of 
the hydroid under discussion, the absence of tactile hairs on the tips of 
1Fewkes, J. W. 1883. Ona few Meduse from the Bermudas. Bull. Mus. Comp. 
Pool Hat. Cole, X1.p: o7- 
2T am aware that the name Stauridium has the authority of | older usage. In fact 
it was this name that was originally applied to the hydroid “nurse ” of the free- 
swimming Cladonema found by Dujardin in his aquarium. It is unfortunate that it 
did not appeal to this astute naturalist as a convenient and permissible practice to 
call two stages in the development of the same animal by the same name. Had there 
not arisen confusion in the application of the name which Dujardin gave to his hydroid, 
to other similar but not identical forms, it might be best to continue to use two dif- 
ferent names for the medusa stage and the hydroid stage of the animal in question. 
The old name has, however, been applied (Haeckel: System der Medusen) to hydroids 
whose progeny are not Cladonema, but Sarsia. It is certainly desirable to simplify 
our nomenclature to the utmost. I have thought that in this case it was by far 
the better plan to follow Hincks in his very logical decision in the matter. 
