176 ANNALS OF THE QUEENSLAND MUSEUM. 
middle third being more or less immature. In another specimen 
of 10 cm. in length, ripe eggs were present in the latter portion of 
the chain. 
The scolex is relatively broad (0.96 mm.) but is not marked off 
from the succeeding portion of the strobila. Its apex projects more 
or less prominently. In Fig. 1 it is a low cone, while in one case- 
it was seen as a distinct ro stellar-like structure. A retractile 
rostellum is absent. At the tip of the apex there is an apical 
sucker or perhaps more correctly a,n apical muscle-plug, there 
being a very small terminal cavity. This plug is not a powerful 
organ when compared with the four large suckers, which are very 
efficient organs of fixation. The latter measure about 0.44 mm. in 
transverse diameter, the deep cup-like cavity being directed almost 
anteriorly. There is a longitudinal furrow between each pair. The 
cuticle of the scolex, and especially its apex, bear abundance of 
minute backwardly directed and closely set bristles or spines 
similar to those found in many species of Ichthyotcenia (i.e., 
Proteocephalus). They are also present in the suckers. These tiny 
projections become gradually smaller in the succeeding portions 
of the chain, but are still recognisable in segments which have 
reached sexual maturity, though they are then very minute. 
The scolex becomes gradually narrowed into a relatively long 
unsegmented neck. At about 8 mm. from the anterior end segmen- 
tation becomes recognisable by the development of transverse 
septa. There is no overlapping of proglottids, and, excepting in 
the case of ripe segments, segmentation is scarcely if at all visible 
to the naked eye, owing to the ab.-ence of marginal indentations 
in the anterior portions of the chain. Each segment is typically 
rectangular, the whole strobila very much resembling a> narrow 
flat band. Ripe proglottids vary somewhat in size, being from 4.3 
to 5.25 mm. in length by 1.0 to 1.2 mm. in width. 
Musculature, dr. — The cuticle is a very thick layer (0.017 mm.) 
showing a distinct stratification, an outer more deeply staining 
layer, and an inner clearer and rather wider zone. Below it is a 
definite basement membrane succeeded by a well-defined layer 
of subcuticular circular muscle fibres. Immediately within these 
is the outer subcuticular longitudinal musculature, the fibres of 
