[5] 



MEDUS.E FROM THE GULF STREAM. 



517 



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 Pteropliysa collected by the Blake. 



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 mm in length. 



Pleurophysa, gen. nov. 

 P. insignis, sp. nov. 



Among the new Bhizophysidre are many specimens of a genus which 

 is different from any yet described, and which probably is anew genus 

 as well as species. The specimens are very numerous and come from 

 the following localities: 



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, pyriforin, 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 a row of knobs. These were at first thought 



