910 LIVERPOOL BIOLOGICAL SOCIETY. 
diagnosis of it. It comes very near to Raspailia, but the 
latter is conveniently kept distinct on account of its very 
characteristic whip-like external form.’ Consequently 
the genus Awnella seems to fulfill a similar function 
amongst the Aazmellzde to that of Amphilectus, Vosmaer 
amongst the Desmacidonide. 
Externally and in colour, Awvinella mammillata, n. sp., 
has very much the appearance of Polymastia mammillaris, 
J. It consists of a basal mass with papillee arising from it. 
The basal mass measures 22 mm. by 16 mm. horizontally 
and 8 mm. vertically. here are about thirty papille on 
the specimen, with a length of 1 to 8 mm. and 1 to 1% 
mm. in thickness. Generally we find two or three papille 
springing from a common origin. The colour is oiange, 
with exactly the same tint as Raspailia rigida, M. 
The skeleton consists only of megasclera, and these are 
styli of two different sizes, the one kind measuring 0°5 
mm. by 0°008 mm., and the other kind 0°15 mm. by 0-004 
mm. Inside the papille the longer styl are packed to- 
gether in bundles which run parallel to the longitudinal 
axis of the papille. The shorter styl do not form bundles, 
they stand at right angles to the longitudinal axis of the 
papille, and project for about half their length through 
the ectoderm. Some of the styli show a slight swelling 
on their broader end and approach tylostylote character. 
Ceratose is present in this species, but only in very 
small amount. Itis found near the base of the bundles 
of the large styh. 
Interesting are certain spindle-shaped granular cells 
(see Pl. X, figs. 4 and 5) of the mesoderm, measuring about 
0-018 mm. by 0.003 mm. Their nucleus is small, and often 
only indistinctly seen. These cells are aggregated together 
in strands, and are found in the immediate neighbourhood 
of the longitudinal bundles of styli, and running parallel 
