RECORDS OF W.A. MUSEUM. 
[207 
Text Figs, g, 10 and ii. 
Text fig. 9. — Philocryfhus flavoguttatus, Fletcher. 
Text fig. 10. — Helioporus alhopnnctatus , Gray. 
Text fig. II. — Helioponis pictus, Ptrs. 
a. Ventral view of sternal apparatus. 
h. Dorsal view of terminal phalanx of fourth toe. 
c. Lateral view of same. 
d. Dorsal view of sacral vertebra. 
plate, and separated from one another at their tips by a distance 
equal to their length. In Helioponis albopunctatus (Text Fig. loa), 
the sternum is a weak, semi-ossified plate, slightly nicked 
posteriorly; the ossification is confined to two longitudinal 
tracts one each side of the median line. In Philocryphus the free 
edge of the left or ventral-most epicoracoid cartilage is slightly 
calcified and considerably thickened ; it forms a prominent ridge 
for the attachment of the anterior section of the pectoralis major 
muscle. No such ridge is discernible on the epicoracoid of H. 
albopunctatus, nor do the two epicoracoids overlap to nearly the same 
extent as in Philocryphus. Another difference is apparent in the 
shape of the omosternum. In H. albopunctatus, it is a simple 
narrow band of cartilage, while in Philocryphus it is expanded 
anteriorly into a semi-circular plate. The omosternum, however, 
shows considerable variation in this (see Text Fig. iia, H. pictus) 
