238 
THE VOYAGE OF H.M.S. CHALLENGER. 
that he might be able to identify the species. In his reply he confirmed the idea that 
had been expressed that they were large Rhizopods, and suggested that the chief differ- 
ence between the specimens sent and his genus Dendrophrya consisted in the fact that 
the tests of the former were free, whilst the latter represented an essentially fixed or 
adherent type. To this it may be added, that Prof. Biitschli, in his recent classification 
of the Rhizopoda, expresses a similar opinion, and describes Dendrophrya as resembling 
morphologically an Astrorhiza adherent by its central disk. 
For twenty years the genus appears to have remained entirely unnoticed by Rhizo- 
podists. As the subject appeared to be one of some importance, and there were many 
points concerning which additional information was required, I called the attention of my 
friend Mr. David Robertson, F.G.S., to the original paper, thinking it possible that he might 
have met with the organism during his long and varied experience in shore-collecting. 
This did not prove to be the case, but the subject was one that interested him so much 
that he made a visit to the recorded locality, Old Granton Quarry, near Edinburgh, in the 
hope that the species might still be found there. Unfortunately on that occasion the 
search was unsuccessful, but ere long I received from him a number of specimens gathered 
from similar localities on the west coast of Scotland, amongst which it was not difficult 
to recognise Dendrophrya radiata. In company with it was an erect branching modifi- 
cation of the same type, which, though it does not agree in all points with the figure of 
Dendrophrya erecta in Dr. Wright’s paper, has the same general characters, and there 
can be little doubt belongs to that species. The following notes are founded on the speci- 
mens collected by Mr. Robertson. 
Dendrophrya radiata, Str. Wright (PI. XXVII. A. figs. 10-12). 
Dendrophrya radiata, Wright [1861], Ann. and Mag. Nat. Hist., ser. 3, vol. viii. p. 122. 
Test sessile, depressed ; consisting of a central chamber, with spreading, more or less 
adherent, tubular arms ; arms very irregular in contour, often branching, the open distal 
extremities forming the pseudopodial apertures of the test. Walls chitinous, somewhat 
thickly coated with mud ; central chamber in adult specimens firm and hard. Size very 
variable, rarely inch (6 mm.) in diameter. 
The following is Dr. Wright’s account of this species : — “ Its general appearance is that 
of a small shelly mass, from the borders of which radiates a system of branched 
membranous tubes, more or less coated with mud or other matters. In young specimens 
the central shell is absent, and the animal presents the appearance of an irregular system 
of branches radiating from a centre. The shape of the adults is very various, and depends 
on the surface to which they are attached ; they attain sometimes a diameter of nearly a 
quarter of an inch, though generally much smaller. The shell is not acted upon by acids. 
