GEOGRAPHICAL AND BATHYMETRICAL DISTRIBUTION. 
In the following arrangement I have adopted the regions given by Prof. Busk in his 
able Eeport on the Polyzoa, which regions are generally acquiesced in by most 
observers. They are, indeed, such as suggest themselves in a natural grouping of the 
oceanic areas. 
In the first of these. A., the North Atlantic Eegion (see the sketch-map), a large 
number of forms occur, and relatively few range to other areas ; but this apparent 
definition in so vast a region is probably due to the comparatively unexplored condition 
both of it and the other oceans. "Within its limits marked diversities present them- 
selves, such as the comparative absence of the Amphinomidse (with the exception 
of Paramphinone) in the north-eastern part of the area, and their abundance in 
the south-western; the appearance of the Euphrosynidae between tide-marks in the 
southern parts, and their limitation to the deeper water in the northern. Most of the 
genera are cosmopolitan in their range, but the remarkable new genus BusJciella is entirely 
confined to the abysses of this and the South Atlantic. Many interesting extensions of 
the previously known range of genera have been made by the Challenger, for example, 
the finding of Pulepis in the West Indies, its original habitat being in the Philippines*. 
The cosmopolitan habits of such types as Harmothoe imhricata, Hyalinceda tubicola, 
Scolecolepis cirrata, and Terebellides stroemi have also been more clearly disclosed. 
SUEFACE FoEMS. 
Besides the purely pelagic Alciopidae, which were met with by the Challenger in 
the Atlantic and Antarctic Oceans, as well as more abundantly in Mid Pacific, oflF the 
Sandwich Islands, Tomopteridae and various larval forms occurred. A m ongst the latter 
were young Terebellidae, about half an inch in length, which were caught in the Atlantic 
on the return voyage. Various larval Polygordii were found in the tow-nets near 
St. Vincent, Cape Verde Islands, along with Tornaria, Pteropods, and Copepods. 
Tomopteris, again, ranged to both Atlantic and Pacific Oceans, and was ? ccompanied by 
Sagitta, Copepoda, and various larval forms such as the young of Chh'odota. The 
