1885.] 



MR. R. COLLETT ON ECHIDNA ACANTHION. 



15.' 



E. aculeata. In these specimens the crista sagittnlis is also sharp 

 and longer, whereas only a trace of it may be observed in the younger 

 skulls. 



The snout is of moderate length or rather short. Tn the full-grown 

 specimen its proportion to the length of the skull is as 1 to 2|, as 

 will be seen by the list below, and in several specimens it is but a 

 little longer than the breadth of the skull'. 



Measurements. 



In the full-grown specimens the snout is more or less distinctly 

 turned upwards, the profile of the front being deeply concave over 

 the orbits, and down along the nascdia, and the lower margin of the 

 skull rises obliquely in front of the oihits. Thus the skull forms 

 a distinct contrast to that of ProecJiidna bruijni from New Guinea; 



Fig. 3. 



Fig. 4. 



Fig. .S. Skull of Echidna acanihion, $ (back view). No. 9. 

 Fig. 4. SkuU oi Echidna acanthion, J (back new). No. 5. 



probably the otiier Papuan species, E. lawesi, has a similar concave 

 snout to E. acanthion. The palate is armed with about nine rows 



' The snout is measured without the cutaneous covering, from the /oramew 

 lacrymale in the skeleton, or the foremost margin of the eye in the skiu. 



