GONOSPORA MINCHINII 161 
A spore with its eight sporozoites is shown in fig. 15 ; it is from 
8 to 10 / in length. The sporocyst is thin, one pole being 
rounded and the other provided with a slight thickening, but 
there is no well-developed funnel such as occurs in Gono- 
spora glycerae (8). 
For this new gregarine we propose the name Gonospora 
minchinil. 
Summary .—The new species of gregarine described above, 
and to which we have given the name Gonospora min- 
¢hinii, occurs in the coelomic fluid of the female Arenicola 
ecaudata. The adult trophozoite is pear-shaped, and the ripe 
spore has a thin cyst without distinct funnel. The young tropho- 
zoite lives in the egg floating in the coelomic fluid of the Areni- 
cola, where it grows at the expense of the food-material stored in 
the ovum. To reach the ovum it pierces the vitelline membrane 
and perivitelline layer. The growing trophozoite occupies a deep 
depression it causes in the egg, to which it adheres by its 
epimerite. The margin of this depression becomes drawn out 
into delicate protoplasmic processes. The cytoplasm and 
nucleus of the host-cell, and also the development of the peri- 
vitellme layer, are affected by the presence of the parasite. 
When full-grown the trophozoite escapes from the egg by a hole 
pierced in its envelopes, and leucocytes then enter the space 
so left to complete the destruction of the ovum. 
REFERENCES. 
1. Gamble, F. W., and Ashworth, J. H.—‘* The Anatomy and Classifica- 
tion of the Arenicolidae ’’, ‘ Quart. Journ. Micros. Sci.’, vol. xliii, 
1900. 
2. Léger, L., et Duboseq, O.—‘ Etudes sur la sexualité chez les Gré- 
garines ”’, ‘ Arch. f. Protistenk.’, Bd. xvii, 1909. 
3. Pixell Goodrich, H. L. M.—** The Gregarines of Glycera siphonostoma ”, 
‘Quart. Journ. Micros. Sci.’, vol. lxi, 1916. 
4. Trégouboff, G.—‘‘ Etude monographique de Gonospora_ testiculi 
Trég.”’, ‘ Arch. Zool. Expér.’, vol. lvii, 1918. 
NO, 257 M 
