a4 PROF. E. A. MINCHIN ON PROTOZOAN [Jan. 12,, 
a very large round karyosome. In one preparation the karyosome 
appeared to fill the whole nuclear space and to be of irregular 
form (fig. 75); a result perhaps due to insufficient extraction of 
the stain. 
5. TRYPANOSOMA ABRAMIS Lay. & Mesn, (Plate IT. figs. 30--32.) 
The occurrence of trypanosomes in a Bream was noted by 
Laveran and Mesnil in 1902 (Arch. Protist. i. p. 478) and the 
species was named by these authors, but without any figure or 
description, in 1904 (Trypanosomes et Trypanosomiases, p. 388). 
Keysselitz also noted the occurrence of this parasite (Arch. 
Protist. vii. p. 3). According to Brumpt, the trypanosome of 
the bream goes through its development in the leech Hemiclepsis. 
In my preparations of the blood of the bream from Sutton 
Broad I have found a trypanosome very sparingly; three 
Specimens altogether, one from one fish, two from the other. 
The trypanosome is of large size and presents no character by 
which I can distinguish it morphologically from Zrypanosoma 
tince. 1 consider it very probably identical with this species ; 
in which case the name ftincw has priority over abramis by one 
page; but in view of the scantiness of my observations I refrain 
from taking the step of merging the two species into one. 
6. TRYPANOPLASMA GURNEYORUM, sp. n. (Plate IT. figs. 33-39 5. 
Plate LV. figs. 56-65.) 
The occurrence of a trypanoplasm in the Pike has only been 
noted, so far as T am aware, by myself (Quart. Journ. Mier. Sei, 
lii. p. 253, text-fig, B). I found it abundantly in all pike 
examined at Sutton Broad, usually occurring together with 
Trypanosoma remaki Lay. & Mesn.; in one pike, however, I 
found a very abundant infection with the trypanoplasm, but no 
trypanosomes. I propose to name this trypanoplasm 7’. gurney- 
orum, in honour of Messrs. Eustace and Robert Gurney, in whose 
laboratory this work was done. 
Trypanoplasma gurneyorum occurs under two forms, which 
I will distinguish as “ordinary ” and “large.” The large forms 
appear to be very scarce; I have seen only two specimens so 
far, both in preparations from the fish mentioned above, in which 
only trypanoplasms were found. The ordinary form of 7”. gurney- 
orum (figs. 33-37) is characterized by a fairly broad undulating 
membrane and by the shortness of the free flagella. The anterior 
free flagellum is searcely more than half the length of the body. 
The posterior free flagellum projects only a very short distance 
beyond the hinder end of the body ; in some specimens it is rather 
longer, but it is always short by comparison with other trypano- 
plasms. The trophonucleus is near the middle of the body, 
sometimes even in the posterior half. The form of the anterior 
extremity of the body shows variations, which are perhaps due 
