1879. | Recent Literature, IIQ 
= Asan example of the mode of treatment of his subject we 
may refer to the account of the Hydroid polyps and coral polyps. 
—Schematic section through an island, indicating the different steps in the 
forniad of an atoll. 
Fic. 10——Colony of Hydractinia echinata on a Buccinum shell inhabited by a 
hermit crab. Natural si 
The Hydractinia, jelly fishes and other forms that lead up to the 
Anthozoa or genuine polyps, are discussed, and the latter are fully 
described, and their mode of development as originally worked 
out by Lacaze-Duthiers and Haeckel, as well as the that of Hai- 
cyonoid polyps and sea-pens. A lengthy chapter is devoted to 
the rooe of coral reefs and coral islands, based on the researches: 
of Darwin, Dana, Ehrenberg and other naturalists. The accom- 
panying ker bruteca will convey an idea of the mode of pictorial 
treatment. 
Of the full-page illustrations those of the Octopus or Kraken, 
the paper Nautilus, the group of Holothurians, are especially 
noteworthy. In conclusion we can only praise in the highest 
terms this great work, the preparation of which has been entrusted 
