134 THE POPULAR SCIENCE MONTHLY 



fossils constitute a great group of the animal kingdom probably equiva- 

 lent to a suborder. In 1867 he named 26 genera and 126 species of 

 ammonites. 



He also made a detailed and very careful study of the anatomy of 

 the so-called " moss-animals," or fresh-water Polyzoa, the structural 

 details of the species being tabulated in order to facilitate comparisons. 

 This work was published in the Proceedings of the Essex Institute, in 

 1866-67, and also in the American Naturalist, and is illustrated by 

 careful and accurate outline figures drawn from life by Hyatt and 

 beautifully engraved on wood by that matchless draughtsman E. S. 

 Morse. In this and all of his subsequent papers Hyatt furnishes a model 

 that systematic zoologists will do well to follow in the accurate and de- 

 tailed description of species. 



While at Salem he also began that study of sponges which was to 

 make him the leading authority among systematic zoologists of Amer- 

 ica upon these animals. His principal papers upon sponges were not 

 published, however, until 1875-78 in the Proceedings and Memoirs of 

 Boston Society of Natural History. He agrees with MacAllister that 

 sponges constitute a subkingdom or branch of the animal kingdom equiv- 

 alent to one of the larger divisions. He describes 36 new species, and 

 gives an excellent account of the methods of the commercial sponge 

 fisheries of Florida, and discourses upon the embryology, anatomy, 

 physiology and relationships of sponges, deciding, in common with 

 Barrois, that in sponges there is no gastrula stage. 



But Salem was too small to provide careers for so many young, 

 active and well-trained students of natural history. Of the four 

 friends, Morse remained in Salem ; Packard went to Brown University ; 

 Putnam became an anthropologist and curator of the Peabody Museum 

 in Cambridge and also in other institutions; and on May 4, 1870, Hyatt 

 was elected custodian of the Boston Society of Natural History. In 

 1881 he became its curator and remained the scientific head of the 

 society until his death in 1902. 



After 1873 he made his home in Cambridge, where he could be near 

 the great collection of cephalopods of the Museum of Comparative 

 Zoology, and in 1879, under the auspices of the AVoman's Educational 

 Association of Boston, he established a summer laboratory for the study 

 of marine zoology upon his country place at Annisquam, Mass. At this 

 time also he owned a 60-foot schooner yacht, the Arethxisa, with which 

 he made scientific cruises along the New England coast, going as far 

 north during the summer of 1885 as the west coast of Newfoundland 

 and lower Labrador, to study the fossils and the general geology of these 

 regions. His companions upon this cruise were five young men, among 

 whom were Professor George Barton and the late Dr. E. A. Gardiner. 



The situation of Annisquam was found to be unfavorable for the site 



