OF THE KERGUELEN REGION OF THE GREAT SOUTHERN OCEAN. 



499 



diurnal temperature in tlie two regions tending to balance and approximate closely to the 

 annual mean for the whole earth. In the foregoing we have not taken into consideration 

 the effect of the refraction of the earth's atmosphere on the sun's rays, lint it is evident 

 that a very much smaller sun than one subtending an arc of 46° 56' would produce an 

 equable temperature all over the earth when aided by atmosplieric refraction. 



Hemifistcr aivcrtwsus (Pliilippi). Apical portion of 

 test of male seen from within, sliglitly enlarged. 



Hemiasier cavernosux (Pliilippi). Apical portion of 

 test of female seen from within, slightly enlarged. 



Hemiaster mvcnwsiis (Pliilippi). 

 Accessible Bay, Kerguelen, -j. 



Hemiaster cavcrnosiis (Philippi). Arrangement of 

 eggs iu one of the Marsupial recesses, f. 



