No. 397.] REVIEWS OF RECENT LITERATURE. 73 
A new pelagic nemertine is described by Woodworth (Au. Mus. 
Comp. ZoóL, Vol XXXV, No. 1, July, 1899). It was taken by the 
Albatross while trawling at a depth of 500 to 2000 fathoms in the 
Pacific Ocean, and differs from the forms obtained by the Cha/- 
lenger expedition in several important particulars which justify its 
inclusion in a new genus — Planktonemertes. 
Metagenesis in the Coccidia and Hzemosporidia is the subject of a 
recent important résumé by Schaudinn (Zool. Centralblatt, Vol. VI, 
No. 22, pp. 765-783, October, 1899). The article is accompanied 
by an extensive bibliography of the subject. 
Notes on some exotic species of ectoparasitic trematodes, re- 
cently published by S. Goto (Journ. Sci. Coll. Imp. Univ., Tokyo, 
Japan, Vol. XII, No. 4, pp. 263-295, Pls. XX, XXI, 1899), include 
studies made in this country, chiefly at the Newport Marine Labora- 
tory. A dozen species, seven of which are new, are described with 
care, numerous points in the synonymy cleared up, and many details 
of anatomical structure worked out. One new genus, Dionchus, was 
discovered which unites characters of the Gyrodactylide and Mono- 
cotylide. American students are fortunate in having such satisfac- 
tory descriptions and-illustrations of native forms as those given 
ere. 
C. T. Simpson has given in the Bulletin of the United States Fish 
Commission for 1898 a readable and interesting account of the 
Structure, habits, enemies, and commercial value of our fresh-water 
mussels, 
No. 5 of the third volume of the American Journal of Physiology 
contains the following articles: * A Modified Soxhlet Apparatus for 
the Extraction of Fat from Liquids," by A. E. Taylor; *A New Form 
of Piston Recorder and Some of the Changes of the Volume of the 
Finger which it Records," by W. P. Lombard and W. B. Pillsbury ; . 
and “Secondary Rhythms of the Normal Human Heart,” by W. P. 
Lombard and W. B. Pillsbury. 
The first number of the Biological Bulletin, edited by the director 
and members of the staff of the Marine Biological Laboratory at 
Woods Holl, Mass., has appeared, and contains the following articles: 
* Some Relations between Nervous Tissue and Glandular Tissue in 
the Tunicata," by M. M. Metcalf; “Regeneration of Tissue composed 
of Parts of Two Species,” by T. H. Morgan; “ Dinophilus gardineri 
