Fewkes. } 292 [October 1, 
Geological Survey of New Hampshire for the year 1871 I made the 
following observation: 
‘As the ore here occurs in vertical segregations, there is more un- 
certainty as to its extending to a great depth than if the ore occurred 
in lodes in a stratified rock; but this uncertainty is in a measure 
counterbalanced by the large masses in which it occurs.” The local- 
ity is easiest reached from Glen Station, on the Portland & Ogdens- 
burg railroad. 
NOTE ON THE STRUCTURE OF RHIZOPHYSA FILIFORMIS. 
By J. W. Fewxes. (With Plate 2.) 
The interesting Siphonophore Rhizophysa filiformis was discovered 
and first described by Forskal. He gave it the name Physophora 
and does not seem to have separated it from Athorybia nor from that 
animal which is now known as Physophora hydrosiatica. Many subse- 
quent naturalists have confounded it with other genera, or considered 
it a mutilated stem of another physophorid whose swimming bells 
and covering scales had fallen off. Chamisso found a Rhizophysa 
in the northern Pacific, and Eysenhardt described it as a new species. 
In the classical work of Eschscholtz a third species is mentioned and 
referred to the genus Epibulia. 
Brandt divides the genus into the two forms, Rhizophysa and 
Brachysoma, which differ only in the length of the body. As Gegen- 
baur rightly says, the latter genus may be simply a form of Rhizophysa 
with contracted stem. 
Lesson, in his Acaléphes, gives a short description and drawing of 
Rhizophysa, between which in certain respects, as Huxley says, 
there is a lack of consistency. His so-called ‘“ paquets d’ovaries,” 
which must be the reproductive organs described by Gegenbaur, as 
Huxley well comments, are described as “‘ jaunés,” and figured as 
bright pink. The imperfection of his knowledge of the genus, as we 
now understand it, is clearly brought out by the praise which he gives 
Delle Chiaje’s description of another animal which was thought to be 
his own Rhizophysa. 
Still another example of this animal was described by Huxley in 
his work on the Oceanic Hydrozoa. 
Huxley evidently had the species of Rhizophysa called R. Eysen- 
hardtit in the single specimen which he found in the Indian Ocean. 
The peculiar unbranched organs from the tentacles, the existence 
