BY J. DOUGLAS OGILBY. 



417 



Castelnau's figures, the circumference of the body being omitted 

 as unnecessary. 



Of all these measurements only one (vii.) of Castelnau's shows 

 a nearer approach to my Geotria austraiis than to Velasia 

 stenostomits, while the two most important (v. and ix.) distinctly 

 support the latter. 



The three measurements connected with the head (ii. toiv.)are 

 so curiously similar to those of my Moi'dacia that I cannot refrain 

 from conjecturing that Castelnau had an example of each species 

 ( Velasia and Mordacia) before him, and somehow got the 

 dimensions mixed; and if further evidence is necessary as to the 

 probable truth of this conjecture, I may mention that in the table 

 of measui^ements of M. mordnx given by Castelnau {I.e. p. 2S0) 

 the distance between the extremity of the snout and the centre of 

 the eye is contained 14i times in the total length, or nearly the 

 same as that in my V. stenostomiis. In the same table the length 



