542 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Revivification of Infusoria.* — Prof. M. Nussbaum has previously 
shown (1889) that Infusorian cysts may survive two or even three years’ 
desiccation. Maupas has proved the same for 22 months. Weismann 
found that eggs of Artemia salina were capable of development after 
lying nine years in dry mud. But precise data of this sort do not seem 
to be numerous. Nussbaum has therefore made careful experiments with 
the cysts of the Infusorian Gastrostyla vorax dried in September 1885. 
None revived in 1897. The cytoplasm examined microscopically showed 
a complete loss of its usual structure. 
Euglena sanguinea. j — Herr F. Thomas records the occurrence in a 
small lake in the Alps, at a height of about 2120 m., of enormous 
quantities of this organism, giving a blood-red tinge to the water. It 
displayed positive heliotaxis ; the pigment was hasmatochrome. 
Stichospira paradoxa.f — Hr. Y. Sterki describes this new genus and 
species of ciliated Infusorians. The body when extended is very long, 
consisting of a bulbous posterior part, a long and slender neck, and an 
anterior part with the peristome and a long corkscrew-like anterior 
extension curved dorsal wards and to the right, bearing the prolonged 
adoral zone of cilia. When contracted it is obovoid with the anterior 
end rather pointed. The substance of the body is slightly yellow. One 
contractile vacuole is situated in front of the peristome, somewhat to the* 
left and dorsal ward, another lies near the posterior end. Two almost 
globular endoplasts were seen, but not very distinctly. In the posterior 
region there are usually numerous food-granules and minute strongly 
refracting particles. On the right margin of the rather deeply excavated 
peristome is a broad thin hyaline membrane, standing out perpendicu- 
larly ventral ward ; it is rather stiff and slightly undulating. The anus 
is anterior, to the left of the peristome, and constant. Twelve sets of 
cilia are described. The food consists of very small particles, and the 
animal usually lives in the cavity of some plant. Very often there is 
also a tube made by the animal out of some mucous secretion usually 
plus foreign particles. It has much in common on the one hand with 
Frey a and Amphilejptus , and on the other hand with Stichotriclia acuminata 
Pty., but it is very distinct. 
Guide to Sporozoa.§— Yon Wasielewski has compiled a guide to help 
physicians, veterinarians, and even zoologists in the study of this difficult 
and important class. He gives diagnoses of the known species of the 
five orders — Gregarinida, Hmmosporidia, Coccidia, Acystosporidia, and 
Myxosporidia, and appendices on Sarcosporidia, Amoebosporidia, and 
Serosporidia, which are less definitely characterised groups. The general 
life of these parasites is briefly discussed, the hosts are classified, and 
the student is introduced to the special literature and technique. The 
utility of this work is obvious. 
Malaria in Senegal.|] — Dr. E. Marchoux records observations made 
on the kmmatozoon of malaria, which go to support the view maintained 
* Zool. Anzeig., xx. (1897) pp. 354-6. 
t Mitth. Thuring. Bot. Ver., x. (1897) pp. 28-39. See Bot. Centralbl., lxxi. 
(1897) p. 364. % Amer. Nat., xxxi. (1897) pp. 535-41 (1 pi.). 
§ 4 Spcrozoenkunde, ein Leitfaden fur Aerzte, Tierarzte, und Zoologen,* J ena, 
1896, 8vo, 159 pp. and 111 figs. See Biol. Centralbl., xvii. (1897) p. 688. 
_ || Ann. Inst. Pasteur, xi. (1897) pp. 640-61 (1 pi.). , 
