414 REVIEWS AND BOOK NOTICES. 
of the ocean.” Fig. 107 is a mass of the protoplasmic material 
of which Bathybius is formed, with Coccoliths embedded in it, 
magnified seven hundred diameters. 
As an example of the sponges abounding at great depths is the 
Holtenia Carpenteri (Fig. 108, half the natural size). A charac- 
teristic coral is the Lophohelia prolifera of Pallas (Fig. 109, three- 
fourths the natural size), which at the depths of three hundred to 
Fig. 113, 
Arcturus Baffini, 
six hundred fathoms “forms stony copses covering the bottom for 
many miles 
Among the Echinoderms, the Rhizocrinus Loffotensis of Sars 
(Fig. 110, once and a half the natural size) is interesting not only 
in itself, but as having been found abi! Pourtalés to occur in the 
depths of the Gulf Stream off Flori 
The starfish, Archaster, is inste of the abysses of the 
northern seas, and a fine new form is Archaster vexillifer W- 
Thomp. (Fig. 111). A most singular and intensely interesting 
