ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
53 
vacuole. With increase of size the parasite degenerates, losing the 
tuft of cilia and the caudal tuft. 
New Monocystid Gregarines.* * * § — Sig. P. Mingazzini describes some 
new and imperfectly known Gregarines from the Gulf of Naples. The 
new genus Polyrabdina has dimorphic species, — nematoid and pyriform, 
the former elongated and fusiform with very numerous longitudinal 
strias on the cuticle, and includes P. Spionis (= Gregarina Spionis Koll.), 
P. Cirratuli ( = Gr. Cirratuli Lank.), and P. Serpulee Lank. The new 
genus Esarabdina has also dimorphic species of nematoid form, and 
includes E. Terebellse ( = Gr. Terebellse Koll., Monocystis Telepsavi 
Stuart), and E. Synaptse sp. n. The new genus Nematoides, elongated 
and fusiform, truncated anteriorly, pointed posteriorly, is represented 
by N. fusiformis sp. n. from the intestine of Balanus perforatus. In the 
genus Urospora, the species U. longicauda ( = U. Nemertis Koll.) is 
redescribed. The new genus Pacltysoma, quadrangular in form, is 
established for Gregarina Sipunculi Koll. 
Malarial Infection and the Hsematozoa of Laveran.f — From 
observations made on thirty-three cases of malaria in Texas Dr. G. Dock 
has verified the presence of the plasmodia in the blood. The author’s 
attention was chiefly devoted to the ectoglobular form of the parasites, 
which, like the endoglobular parasites of tertian ague, develope from 
small spheroidal hyaline bodies, but their development seems to be more 
rapid, and does not appear to stand in direct connection with the out- 
break of the fever. In the plasma they may be observed singly or in 
collections, and show a dark granular pigment usually located towards 
their peripheral portions, but occasionally lying more centrally. From 
these bodies arise the flagellate forms, a condition preceded by lively 
movements in the pigment-granules. The filament protruded is usually 
hollow, occasionally pigmented, and always mobile. Sometimes a kind 
of budding was observed, and this ended in the production of an offspring- 
parasite resembling the mother in the possession of flagellum and pig- 
ment. The nucleoid body of the maternal parasite did not participate 
in this process of gemmation. 
These parasites seem to be connected with the atypical forms of 
malaria. Their numbers were found to vary rather with the particular 
individual than to have a relation to the stage of the disease in the same 
person. 
The endoglobular form seems to be regarded by the author only as 
a “ sport,” or variety of an organism which, under specially favourable 
conditions, passes into the typical malaria parasites, and may also pass 
into this form. 
Parasitic Protozoa.^ — Dr. M. Braun has a report on recent advances 
in our knowledge of animal parasites. B. Solger § has a notice of a 
new Gregarine from the enteric canal of Balanus improvisus, which is 
distinguished by its circular contractions. Blancliardia cypricola g. et 
sp. n. is an enigmatic form which perhaps belongs to the Sporozoa ; 
* Atti K. Accad. Lincei — Bend., vii. (1891) pp. 229-35. 
t Med. News, July 19tli, 1890. See Centralbl. f. Bakteriol. u. Parasitenk., x 
(1891) p. 254. I Biol. Centralbl., x. (1891) pp. 389-92. 
§ MT. Yer. Neuvorpommern, xxii. (1S90) 4 pp. 
