NOTES AND CORRESPONDENCE. 
Note respecting Parasites found in the Blood of the edible 
Turtle—In Vol. i, N. 8., of this Journal, p. 40, is an 
account by Mr. Canton, of some fusiform ova, found by him 
adhering to the eyes of the edible turtle. Similar organisms 
have since been noticed by Dr. Leared, in the blood from the 
heart of the same animal, in two instances. In one of these 
latter cases, examined in August, 1860, the heart also con- 
tained numerous minute fluke-worms, which were pronounced 
by Dr. Cobbold to belong to an undescribed species of 
Distoma, and named D. constrictum, from its peculiar form. 
Whether the minute oviform bodies noticed by Mr. Canton, 
and these Distomata stand in any relation to each other is yet 
to be made out, and is an interesting subject for enquiry. 
Dr. Leared’s account of the Distomata and oviform bodies 
will be found in vol. xiii. of the ‘Transactions’ of the Patho. 
logical Society, p. 271. 
‘On the Terms used in the description of Diatoms.—Dr. G. 
Fresenius, in the ‘Senckenb. Proc.’ vol. iv., p. 63, describes 
and figures four species of Navicula, one being new. Pinnu- 
laria Silesiaca, Bleisch, and Amphora selina, W. Smith. In 
his introductory remarks he proposes the adoption of the 
terms, “frons” and “latus,” to express what English ob- 
servers call the “front view” and “ side view.” (‘N. Hist. 
Rev.,’ vol. i1., No. 8, p. 481.) 
On the occurrence of Parasitic Sacs on Crustacea and some 
Insect-Larve.— Lieberktthn (Mull. ‘ Arch.,’ 1856, p. 494) and 
Schenk (‘ Verh. der Phys.-Med. Gesells,’ in Wiirzburg, 1858) 
have described certain organisms parasitic upon the gills of 
the larve of Phryganea, Asellus aquaticus, and Gammarus 
pulex. These organisms have been since examined by Pro- 
fessor Cienkowski, who considers them to be forms of a uni- 
