172 THREE CRUISES OF THE “BLAKE.” 
by him from a depth of 1,075 fathoms off the Bermudas. It 
must have attained at least a foot in height. 
Another most common and at the same time most exquisite 
type of Hexactinellide is Aphrocallistes Bocagei (Fig. 522), 
Fig. 522. — Aphrocallistes Bocagei. $. 
which has been dredged by the “ Blake ” in depths of from 164 
to 400 fathoms. It is also found in the eastern basin of the 
North Atlantic. The network appears to be formed by the co- 
alescence of stellate spicules. These sponges are often attached 
to corals and soldered together, so as to form large convo- 
luted masses. Dactylocalyx is one of the most characteristic 
of the Caribbean types. The shape of Dactylocalyx pumi- 
ceus (Fig. 523) varies from that of a cup to that of a flat 
dish attached by a short stem. The surface is furrowed and 
Fig. 523. — Dactylocalyx pumiceus. $. 
