424 



PROF. F. J. BELL ON THE ECHINOMETRID^. [Mar. 15, 



ECHINOMETRA MACROSTOMA. 



The single spineless test which, as it seems, should he referred to 

 this species, gives the following measurements : — 



It will be of great interest to examine the buccal apparatus of this 

 rare species. 



The specimen in the Museum collection bears no indication of its 

 locality ; we know, however, that Dr. Liitken is satisfied as to certain 

 specimens, at any rate, having come from Guinea '. 



ECHINOMETRA VIRIDIS. 



Stomopneustes. 



This is an exceedingly difficult genus, and one with regard to 

 which we must have much more information than we possess at 

 present before we can speak at all definitely as to its real affinities. 

 Whatever be the meaning of the " eccentricity " of its test, I must 

 confess that I see no reason, at present, for regarding it as morpho- 

 logically comparable with that of Echinometra ; for the " tendency 

 to obliquity " is only found in the axis of old specimens, whereas in 

 Echinometra we are informed that the obliquity is " an embryonic 

 feature." "We shall do better to wait for more accurate information 

 than to spend our time in reconciling statements which sufficiently 

 well contradict themselves. 



I give the figures following for what they are worth ; they prove 

 that great variations obtain in the only species of the genus now 

 known to us. 



• Cf. Zool. Eecord for the year 1873. 



