[5] MEDUSA FROM THE GULF STREAM. 51F 
a close likeness to the above, although I have not been able to satis- 
factorily study the other organs. These specimens, in one or two in- 
stances, are destitute of a float, but when that organ is present it has 
the same cluster of flask-shaped immature polypites below it as in Pter- 
ophysa. The polypites themselves have the lateral wings. 
Specimens of Pterophysa collected by the Blake. 

Station. Locality. 

205 | Off Martinique. 
110 | Kingston, St. Vincent. (Lat., 
20° 10/30” N.; long., 74° 19/ 20/’.) 
108 | Off Nuevitas. 

gen. Incog. 
Among the Siphonophores collected by the Blake is one from St. 
Kitt’s, which I have not been able to identify on account of its frag- 
mentary nature. The fragments consist of large numbers of polypites. 
The stem, float, and other organs are wanting. One or both ends of 
the polypite has a very dark red or purple (red) color. There are no 
lateral ptera. The polypites are about 40™™ in length. 
PLEUROPHYSA, gen. Nov. 
P. INSIGNIS, sp. nov. 
Among the new Rhizophyside are many specimens of a genus which 
is different from any yet described, and which probably is a new genus 
as well as species. The specimens are very numerous and come from 
the following localities: 

| 
Cote Ene Station. | North latitude. | West longitude. 

° 1 W ° / " 
12100 2543 39 58 15 70 °42 30 
2585 
2584 

Pleurophysa is destitute of nectocalices and hydrophyllia. The axis 
is thick (in alcohol), and all the appendages arise from one side of the 
stem. 
Float small, pyriform, pigmented at the apex, with thin walls. Just 
below the float there is a small cluster of stylated spherical bodies, 
which occupy the same position as the undeveloped nectocalices in 
other physophores. 
The region of the stem below the cluster of stylated bodies is thick- 
ened, and bears on one side arow of knobs, These were at first thought 
