0* crassolamellata -25- 
smaXler corallites than the t^rpe of the new species, but larger 
than some of the -varieties; hut its costae being strong, very 
close, and alternately very thick and thin, constitutes a 
specific distinction* 
A specimen of Astraea Lif olensis (Jurassic) in the British 
Museum has stronger resemblances to the West Indian forms than 
has A* Guettardi (Miocene)* The general form of the fourth 
variety (var. nobilis ) differs much from that of A* Lifolensis , 
although there is a great resemblance in their details. The 
costae furnish, however, a speoific difference; still the alliance 
is extremely close 
