The Pelagic Tunicata of the Gulf Stream. 93 
ON A NEW SPECIES OF GROMIA (G. APPENDICULARI4). 
On the tails of some of our specimens of Oikopleura unicellular parasites 
were found. One of them is shown in plate 4, figure 12. They are rooted 
in the substance of the tail by a tuft of pseudopodia that do not anastomose, 
and the exposed body is covered by a thin, transparent, stiff capsule. The 
organism is unquestionably a Gromia, and we propose for it the specific 
name, Gromia appendicularie. 
