984 THE AMERICAN NATURALIST. | (Vor. XXXIV. 
Notes. — Professor M. M. Metcalf’s extended studies on the tuni- 
cates have been published in the Zodlogische Jahrbiicher as a series of 
short articles under the general heading “ Notes on the Morphology 
of the Tunicata,” 
On the basis of recent studies on the life history of certain gre- 
garines, Léger and Dubosca (C. R. Acad. Sci. Paris, 5 Juin, 1900) 
find that the epimerite alone is intracellular, and maintain that, con- 
trary to generally accepted views, a true intracellular stage in devel- 
opment is very exceptional among these forms. 
A detailed description of two fish tapeworms from the Great Lakes 
is given by Benedict (Journ. Morph., Vol. XVI, pp. 337—368, 1 pl.). 
One is a well-known European form, and the other an imperfectly 
known species originally described by Leidy. Both belong to the 
genus Proteocephalus Weinland (= Ichthyotania Lönnberg), which 
is shown to be more complicated in structure than hitherto supposed. 
In his chapter on the entozoa, in the Fauna Hawaiiensis (Vol. II, 
Pt. IV, pp. 427-441, 2 pls.), Shipley reprints with emendations the 
description of the peculiar form Apororhynchus (= Arhynchus) hemig- 
nathi which he had previously discussed. It is important as the 
only known Acanthocephalon with no trace of the evertible proboscis 
and hooks ordinarily accepted as characteristic of the group. 
A number of new genera of North American Hydrachnidz are 
described and figured by Wolcott (Zrans. Amer. Micr. Soc., Vol. 
XXI, pp. 177-200, 4 pls.). The only one in the list which was 
previously known was reported once each from Russia and Vene- 
zuela, and is exceedingly aberrant in structure. 
A new cestode of peculiar structure has been found in the turkey 
and is described by Ransom (Trans. Amer. Micr. Soc, Vol. XXI, 
pp. 213-226, 2 pls.) It is characterized by the migration of the 
eggs in masses from the uterus to a point nearer the center of the 
proglottid, where a prominent egg capsule is secondarily constructed 
to include them. "The uterus then becomes reduced, until it dis- 
appears entirely, — whence the name given to the form, Metrolias- 
thes lucida. 
The plankton of Echo River, Mammoth Cave, Kentucky, as listed 
by Kofoid (Trans. Amer. Micr. Soc., Vol. XXI, pp. 113-126) from 
collections made by Eigenmann, is characterized by absence of plant 
life, particularly diatoms, by absence of rotifers, by predominance of 
