38 REVIEWS AND BOOK NOTICES. 
Sars, one of the most eminent of the younger European zoolo- 
gists, anda zoological artist of unusual skill. 
The chief interest of the book is in the accounts and figures of the 
curious crustacean parasites found living on worms. These are 7 
degraded water fleas (Copepoda), like the Lernzans found living 
on the gills of fishes. The Danish naturalist Kréyer, recently de 
ceased, was the first, we believe, to discover one of these parasites 
on a worm (Polynoé). Keferstein, a German naturalist, after- 
wards detected several similar forms, and more recently Steen : 
strup, Claparède and others have found a considerable number on 
different worms. These discoveries form a new chapter in the in 
tricate subject of parasitism, and open up new relations in the 
study of biology. , 
-© New GALAPAGOS Birps.*— During the course of seven years 
explorations in the greater part of Central America, the Cordil- — 
leras of the Andes in Columbia, Ecuador and Peru, Dr. Habe 
found time to visit the Chinca and Galapagos Islands. While he 
paid particular attention to the natural and physical history of 
these regions, he did not neglect the ethnology and meteorology 
of the countries he visited. He has returned with large collec- 
tions stored up in New York, and we trust he may get time to 
arrange and publish the results of his travels. Meanwhile the 
birds of the Galapagos Islands have been identified, and in this — 
article, a list of thirty-seven species of birds collected by him is 
given, with illustrated descriptions of seven new species. : 
authors state that they ‘‘are preparing for publication a memoir ; 
on the avifauna of this group of islands, in which [they] propose — 
to embrace what has previously been recorded on this subject, 
well as the results of Dr. Habel’s arduous investigations.” 
4 
Recent Brrrisu Ostracoprs.t — Whoever attempts the difficult 
and wearisome task of studying and describing the numerous 
shelled entomostraca which swarm in our pools, ponds and streams, 
and also in the sea, will find the occasional papers of Mr. Brady 
invaluable, while the present is a work ranking with the elaborate 
By P. L. Sater and O ma a collested by Dr. Habel in the Galapagos 1 
don.) May, 1870. 8vo. pp. 6, with cuts. : 
tA Monograph of the Recent British Ostracoda. By George S. Brady. (From ® 
Transactions of the Linnzan Society, vol. xxvi. (no date) dto. pp. 142, with 18 p 
