ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
G35 
mechanical agencies, as also by warmth, though there is an optimum 
temperature, above and below which the phenomenon is not exhibited. 
Various foreign substances — alcohol, iodine, sulphuric acid, in moderate 
concentration — produce the luminosity. Electric irritation gave no 
definite results. 
A New Gregarine.* — MM. Maurice Caullery and Felix Mesnil 
describe, under the name of Gonospora longissima , a new coelomic Grega- 
rine, found in the epitokous form of Dodecaceria concharum (Erst., and 
exhibiting several interesting peculiarities. It resembles the other 
members of the genus in being short when young ; but the adults are 
long filaments, 1-2 cm. in length* The life-history of the parasite pro- 
gresses along parallel lines with that of the host. At the sexual maturity 
of the latter, the Gregarine forms its spores, and the cysts are liberated 
by the nephridia with the genital products. The spores hatch in the 
alimentary canal of the new host, and the young penetrate into the 
intestinal cells. The remarkable point, however, is that in these cells 
the young Gregarines undergo endogenous multiplication, and it is these 
secondarily produced forms or sporozoites which reach the coelom of the 
host. This process of self-infection of the host has not been previously 
described in Gregarinida, and is of interest because it has already been 
shown to exist in the Coccidea. 
Haematozoon of Goitre.f — Dr. E. Grasset points out the parallelism 
between goitre and paludism ; each has a peculiar geographical distri- 
bution ; each is associated with the enlargement of an organ of internal 
secretion (thyroid and spleen) ; each may reach an extreme in a cachexia ; 
and each has an associated Hmmatozoon. Laveran has described the 
haematozoa of paludism ; Grasset has found similar forms in the blood 
of recently infected goitre patients. The bodies are spherical and non- 
nucleated, with brick-red pigment ; another form is a “free flagellum” ; 
in others there are numerous agglomerated segments. More details 
must of course be forthcoming. 
Exosporidium marinum.J — M. Dene Sand describes this new para- 
site found on the legs of an Acarid common among seaweed. Its 
membrane, ectoplasm, granules, sluggish movements, and hints of spore- 
formation, suggest a Gregarine ; and the observer places it provisionally 
beside Amoebidium parasiticum described by Cienkowski. 
* Ann. Microgr., x. (1898) pp. 152-5. 
t Comptes Rendus, cxxvii. (1898) pp. 75-7 (10 figs.). 
X Bull. Soc. Beige Micr., xxiv. (1898) pp. 116-9. 
