484 The American Naturalist. 
Zoological News. Prorozoa.—Prof. August Gruber, ina 
on nuclear multiplication and swarm formation in the Fresh 
Rhizopoda * describes an Arcella in which milotic cell division oce 
He also figures Arcella with 19 and 32 nuclei, and Leeythium hyo 
with eightnuclei. These facts are adduced in evidence that amor 
fresh-water Rhizopods reproduction by spore formation coexists 
with simple fission. In other cases Gruber found small bodies in A 
tests which at first sight might be taken for swarm spores but 
are none other than parasitic Amoebæ, 
Worms.—Nachtrieb and Barrows are studying the leeches 
Minnesota. In a preliminary note’ Mr. Barrow states that they 
found 11 species of Gnathobdellidx, 10 of Rhynchobdellide and 1 of 
Branchiobdellide. It is noted that two species of Aulostoma can 
distinguished by the fact that in the one the right sperm duet 
under the nerve cord; in the other the left. A final report 
promised. : id 
Henry B. Ward reports’ the host of Nectonema agile’ Dr.M 
rich found a worm, like Nectonema except that it lacked the 
bands of sete, characteristic of the adult, in the thoracic cav 
Palæmonetes. This when studied by Dr. Ward, proved to be af 
Nectonema. | 
Mottusca.—H. Suter enumerates 142 species of land moll 
fluviatile, and 18 brackish water species, in New Zealand. 
According to ©. Hedley, Parmacochlea fischerii collected by 
“Challenger ” expedition is most nearly allied to Helicarion. 
5 Ber. Naturf, Gesellsch. Freiburg, VI, 114, 1892. 
ê Quarterly Bulletin, Univ. Minnesota I, p. 87, 1893. 
T Proc, Amer. Acad. Arts and Sci. 1893, p. 260. 
*See Amer. NAT. XXVI, 1037, 1892. 
