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THE YOYAGE OF H.M.S. CHALLENGER. 
Syringammina, H. B. Brady. 
Syringammina, Brady [1883]. 
Tire genus Syringammina has recently been established for certain arenaceous 
Bhizopods of large dimensions and rounded form, consisting essentially of masses of 
connected branching tubes radiating from a central point. Our present knowledge of the 
genus is exceedingly limited, and its salient features will be best understood from the 
description of the typical species. 
Syringammina fragilissima, H. B. Brady. 
Syringammina fragilissima, Brady, 1883, Proc. Roy. Soc., vol. xxxv. p. 155, pis. ii. iii. 
Test free; consisting of a rounded mass of branching, inosculating tubes, radiating 
from a common centre, and arranged in more or less distinct concentric tiers or layers, 
which are marked by the formation at intervals of a network of lateral branches. Walls 
arenaceous, composed of nearly uniform fine sand, with little or no inorganic cement. 
Apertures terminal, situated at the peripheral ends of the tubes, closed in with loosely 
aggregated sand-grains. Colour dark-grey when wet, drying to a much lighter tint. 
Diameter about 1^ inch (38 mm.). 
c 
Fig. 9 — Syringammina fragilissima. 
a. Side view of a fragment representing about half an entire specimen. Part of the natural surface is preserved 
at aa. Natural size. 
b. Inferior aspect of the same, representing an uneven fractured surface near the middle of the organism. The 
dotted line indicates approximately the original outline of the test. Natural size. 
c. Portion of a radial section ; showing at cc one of the concentric reticulated partitions. Magnified 8 diameters. 
The organisms to which the foregoing description and figures refer were dredged by 
Mr. Murray in the Faroe Channel, during the cruise of H.M.S. “Triton” in the autumn 
