ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 57 



Peridinium Plankton at Rovigno.* — Hjalmar Broch has studied 

 the species of Peridinium from the Val di Bora at Rovigno. Apart 

 from P. tristylum Stein and P. adriaticum sp. n. (whose geographical 

 range is not known), the species are cosmopolitan or sub-tropical. 

 There are two distinct maxima in the year — a spring maximum, shorter 

 in duration, but quantitatively richer, and an autumn maximum, more 

 prolonged, though less rich. Characteristic of the spring maximum are 

 P. conicum, P. oceanicum f. drupinensis, and P. crassipes f. typica ; 

 while P. quarnerense and P. rrassipes f. dutumnalis are characteristic 

 of the autumnal maximum. 



Parasitic Dinoflagellate.t- E. Ohatton describes Syndinium turbo 

 g. etsp. n. in the body-cavity of Paracalanus parvus, a pelagic Copepod. 

 The organism traverses the epithelium of the gut, and develops in 

 plasmodial form, like one of the euplasmodial Mycetozoa, in the general 

 cavity of its host. They fill the host with legions of macrospores and 

 microspores. The transformations of the macrospores suggest that 

 Oxyrrhis has close affinities with Dinoflagellates. 



Blood Parasites.!— J. A. Gilruth, G. Sweet, and S. Dodd describe 

 Proteosoma biziurse sp. n. from the musk duck {Biziura lobata), and 

 Hxmoyretjarina meyaJocystis sp. n. from a python. 



Protozoon Parasite from Mucous Membrane of Sheep's Abomasum.§ 

 J. A. Gilruth describes a minute oval cyst, with a delicate wall and 

 groups of sporozoites. It may be the schizogonic stage in the evolution 

 of some parasitic sporozoou — perhaps of a Sarcosporidium. It seems that 

 the same parasite has been found by Mesnil and Chatton in Paris. 



Haemogregarine in Blood of Varanus varius.|] — J. A. Gilruth has 

 some notes on an intra-corpuscular Haemogregarine in this lizard. Some 

 free ovoid and curved bodies were also found. 



Protist Parasites from Intestine of Trichoptera.f — Doris L. Mac- 

 kinnon has found in the alimentary canal of caddis-fly larvae certain 

 well-known Gregarines, and several Protist parasites which have not 

 hitherto been described. Chief among these are (a) Triehomastix tri- 

 chopterse sp. n. ; (b) a Spirochaete ; and (c) a Flagellate which appears to 

 be related to Macrostoma caulleryi Alexieff. 



Herpetomonads from Dung-flies.**- -I >oris L. Mackinnon notes that 

 Musca domett tea, and other non-biting Hies frequenting similar feeding 

 grounds, are probably all liable to infection with a common Flagellate of 

 variable form. Infection is casual, i.e. by the mouth. In the case of 

 the dung-flies examined, the larva? ingest faecal matter infested with 

 Herpetomonad cysts : the cysts develop into Flagellates in the mid-gut, 

 where they multiply with great rapidity : towards the close of larval 

 life, when the larva stops feeding, they round up in the hind-gut, and 



* Arch. Protistenk., xx. (1910) pp. 176- 2U0 (11 tigs, and 1 chart), 

 t Comptes Rendus, cli. (1910) pp. 654-6. 

 X Proc. R. Soc. Victoria, xxiii. (1910) pp. 231-41 (3 pis.). 

 § Tom. cit., pp. 19-20 (1 pi.). || Tom. cit., pp. 36 -8 ( L pi.), 



f Parasitology, iii. (1910) pp. 245-54 (1 pi.). 

 ** Tom. cit., pp. 255-74 (1 pi. and 4 figs.), 



