145 
Family Axinellidae. 
Genus Stylotella Ldf. 
Stylotella agminatay Ridi. 
1914. Stylotella agminata, Ridi. Hallmann. A Revision of the Monax- 
onid species etc. Proc. of Linnean Soc. N. S. W. XXXIX. 2. 
Perseverance Harbour, Campbell Isl., under stones, at low water. 9/XI.1914. 
Specimens in hånd incrusting on shells. Greatest thickness 2 
mm. Dermal-membrane very thin and delicate, covers subdermal- 
cavities which can be seen through it, as can also the larger 
superficially lying exhalant canals. It is very beautifully seen 
how they are built up by several smaller canals, and how they 
are at last evacuated into the oscula, as a rule several together, 
so that the oscula may be the centre of nice, starshaped figures. 
Oscula ca. 0,8 1 mm. Ostia ca. 0,io mm in diameter, in most 
places however shut up. Surface finely hispid. Consistence soft, 
somewhat elastic. Colour light gray. 
Skclcton consists of primary fibres directed mainly towards the 
surface; between these fib¬ 
res several spicules are 
scattered disorderly; main 
fibres in places very dis¬ 
tinet, running a long dis¬ 
tance quite unbroken and 
without anastomosing; they 
are often somewat curved; 
in many places they are 
dissolved and new fibres 
originale here and there; 
thickness of fibres rather 
different, commonly ca. 35 
//; a special dermal-skeleton 
could not be made out. 
Hallmann (op. cit. p. 
348) defines the genus for 
One thing in the following 
words: „. . . with a well- 
defined dermal-membrane 
which is provided with tan- 
a 
M 
Fig. 23. Stylotella agminata, Ridi. Styli. subtylo- 
styli) tylostyli, — Fig.24. Hymeniaeidon indistineta, 
nov. spec. Styli. 
Vidensk. Medd. fra Dansk naturhist. Foren. Bd. 75. 
