CHARACTERISTIC DEEP-SEA TYPES. — BRYOZOA. 19 
of the deep-water species belong to the section of the Cheilosto- 
mata, while the Ctenostomata have comparatively few represen- 
tatives. Busk says that the shallower-water species appear to 
have the widest geographical distribution. That is apparently 
not the case with the species collected by the “ Blake.” 
According to Professor Smitt's Reports we may mention 
among the “ Blake” Bryozoa the cosmopolitan Crisia eburnea, 
the form known as C. denticulata (Figs. 323, 323 a), and, from 
306 fathoms, the Scandinavian Diastopora repens (Figs. 324, 
324. a), a well-known ramified form creeping on Terebratula cu- 
bensis. This species is also characteristic of the crag, and per- 
haps identical with a cretaceous form. It seems as if the species 
of this group assumed a somewhat more elongate and simpler 
form in proportion to their bathymetrical range. Busk, from 
an examination of the extensive collection of the * Challenger," 
considers the species of Farciminaria (Figs. 325, 325 a) as the 
most characteristic of the abyssal bryozoans, the preéminent 
forms of the delicate and flexible types inhabiting the tranquil 
depths of the ocean. 
Membramipora canariensis (Fig. 326), a widely spread spe- 
Fig. 326. — Membranipora Fig. 327. — Cellularia cervi- Fig. 327 a. —Cellularia 
canariensis. 146. cornis. 2. cervicornis. Magnified. 
(Smitt.) 
cies, found in both hemispheres, and common in the tertiaries * 
1 There are among the Florida and period, and about five either the same or 
West Indian bryozoans no less than sixteen closely allied to eretaceous types. 
Species identical with those of the tertiary 
