1885.] 



MR. R. COLLETT ON ECHFDNA ACANTHION. 



155 



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 dee|)ly concave over 

 the orhits, and down along the nasulia, and the lower margin of the 

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

 a distinct contrast to that oiProechic/na hruijni from New Guinea; 



Fia;. .3. 



Fig. 4. 



Fig. 3. Skull of EchMia acanfhion, J (back view). No. 9. 

 Fig. 4. SkuU of Echidna acanlhion, j (back view). Ko. 5. 



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

 snout to E. acanthion. The j)alate is armed with about nine rows 



' The snout is measured without the cutaneous covering, from \\\g foramen 

 lacrymaJe in the skeleton, or the foremost margin of the eye in the skin. 



