Columella well developed, formed by interlacing processes from 
the inner edges of the septa, diameter from one-third to one-half that 
of the calico, its upper sdrfas© about 5 mm, below the thecal -margin. 
1 
these spec imsns, it should be repeated, are typical, and except 
in size and to a certain extent In the configuration of the surface 
show almost no variation* The some from the following localities* 
Dry Tortuga© , Florida, Dr* Edward Palmer, collector, 3 specimens! 
east end of Hog island, Bahama© , B. A, Bean, collector, l specimen* 
There are several other specimen®, bearing the indefinite label "West 
Indies** or having mo locality stated. These localities indicate that 
the species in its typical form I® of rather general occurrence in the 
coral reef areas around the Caribbean Boa and Gulf of Mexico, 
Th© recent specimens in the United States national Museum show at 
least four types of variation from the typical form, 
Variation lio, 1 , This variation is, X believe, only a growth 
form. It, In its structural features, is the earn# aa the typical form, 
except the septa near tb© growth edge are less ©xssrt and the exothoca 
appears to be absolutely solid. The sorallum is an obtuse, compressed 
column, with an undulated surface* Gr«at«r diameter of the base, 62 mm, \ 
lesser 52 wm*l height T2 mm* 
Locality; * Dry Tortuga®, Florida* 
Variation Ho* 2* The general growth form is similar to that of typ- 
ical specimens, except the surface is thrown into gibbosities of irregu- 
lar shape and eiR©| thess are often about a centimeter in height and sev- 
eral centimeters in diameter* Th® calices are larger that* In ih© typical 
specimens, often measuring 3, occasionally 4 millimeters In diameter, I,©*, 
between thecal summits* The thecal edges are slightly elevated j the mar- 
