86 
SPOLIA ZEYLANICA. 
under our observation in both fresh and stained preparations. 
We have also observed a double infection (fig. 21). 
The nucleus appears as a more or less diffuse aggregation of 
chromatin granules which sometimes extend to the recurved limb 
of the parasite. The length of the bent parasite is *01 mm. 
In one case the parasite has apparently unbent itself inside the 
corpuscle (fig. 23). 
In a hanging drop prepared from the blood of a specimen which 
had been killed some hours previously we have once only 
observed a motile parasite free in the blood-plasma. The move¬ 
ments consisted of slow revolutions in the arc of the parasite and 
also of movements of flexion. The granular pole was directed 
forwards and the other pole appeared to be more or less fixed or 
adhesive. Finally the parasite was attracted by an irresistible 
chemotaxis to a neighbouring phagocyte by which it was 
gradually absorbed. 
In other cases we have found the bent forms free in the plasma, 
but we attribute this to accident. 
The free motile form observed is apparently simply a tropho¬ 
zoite which has issued from the corpuscle and become free. 
The corpuscle may have undergone liqnefaction, thus liberating 
its inquiline. Such free primary trophozoites have been described 
for H . stepanovi by Laveran* and for H. hankini by Simond and 
perhaps for other cases. Our reason for particularizing on this 
matter will be evident from what follows in the next section 
of this paper. 
Other endoglobular parasites of Chelonians are H. stepanovi , 
Danilewsky, from Emys and Gistudo; H. labbei Bornerf, from 
Platemys and Glemmys ; H. mesnili, Simond, from Emys tectum; 
H. laverani , Simond, from Cryptopus granosus (= Em.yda 
granosa ); H, billeti , Simond,J from Trionyx stellatus. 
Hcemogregarina mirabilis n.sp. 
1 .—Endoglobular Infection. 
A young water snake, Tropidonotus piscator , 2 feet T| inch 
long, recently examined in Colombo, was found to be moderately 
infected with a haemogregarine the trophozoites of which were 
approximately at the same phase of growth, more or less bent 
into a U-shape in the usual haemogregarine manner. 
* Cf. Minchin, E. A., op. cit ., p. 266. 
f Carl Borner, Untersuchungen iiber Hamosporidien, I. Ein Beitrag zur 
Kenntnis des Genus Heemogregarina, Danilewsky. Zeitschr. wiss. Zool. Bd. 69. 
1901, pp. 398-416. 
| Simond, op. cit.. p 388, footnote. 
