ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 603 



cusses the history of research bearing nijon these interesting forms, the 

 author describes at length the genus Gi/mnodinmm, with the species G. helix 

 Pouchet, G. folyphemns var. roseam, G, poh/phemits var. nigrum, G. musaei, 

 Danysz, G. punctatum Pouchet; and further, Polykrikos auricularia Bergh. 

 The Litter inch:)sed in more than one instance a remarkable ovoid body, 

 which presented all the appearances of an ovum. 



Haematozoa of tlie Tortoise.* — Prof, B. Danilewsky communicates a 

 further account of the minute parasites found in the blood-corpuscles 

 (Hfematozoa, Cytozoa, &c.). The present research gives an account of the 

 form and structure of that found in the blood of ^?>i?/s lutaria. The appear- 

 ances of forms of various age and size, their influence on the blood- 

 corpuscles, and other facts are discussed at length. 



In a second paper,t the author describes the general biological characters 

 of the parasite, its movements, relation to reagents, number, geographical 

 distribution, and the like. 



As regards its position among similar forms, the adult presents many 

 close resemblances to Drepanidium ranarum and avium. The presence in 

 the tortoise of gregarinid spores with falciform germs identical with the 

 haemocytozoa, suggests affinity with the Gregarinida. The size, simple 

 constitution, single vesicular nucleus, characteristic movements and mode 

 of life, all support this conclusion, but there can be little doubt that the 

 form described really represents an adult. Danilewsky therefore refers 

 it provisionally to the Monocystid Sporozoa, and names it Hsemogregarina 

 (Testudinis) Stepanowi. 



Protozoa as food of Sardines. | — MM. G. Pouchet and J. de Guerne 

 found an extraordinary abundance of Peridinians in the viscera of sardines 

 from La Corogne ; the species represented were Peridinium divergens and 

 P. polyedricum. The latter literally fills the digestive tube, being recog- 

 nizable even in the rectum ; they measure on the average 36 /x in diameter ; 

 bringing P. polyedricum to the spherical form this gives the volume of an 

 individual as about 25 mm. Estimating the capacity of the intestine at 

 1 cubic centimetre it equals the volume of forty millions of Peridinians ; 

 allowing for the intestines, this number may be reduced one-half, but 

 twenty millions must be regarded as a minimum, for the Peridinians break 

 up rapidly in the intestine of the fish. 



New Infusoria from New Zealand.§ — Mr. T. W. Kirk describes as 

 new Opercularia parallela, which differs from 0. cylindrica in being more 

 cylindrical, and having no striae. Acineta simplex n. sp. has a wineglass- 

 shaped lorica, the anterior half of which is occupied by the animal ; the 

 tentacles are capitate, and are arranged in two groups of about ten each. 

 Eleven species of Voriicella are identified with species described by Mr. 

 Saville Kent in his Manual, and though the antipodean specimens differ 

 slightly, the differences do not seem to be of specific value. Vorticella 

 ohlonga and V. zealandica are new species. 



* Challenger ' Radiolaria. |1 — After ten years' work Prof. E. Hackel has 

 published his gigantic report on the Eadiolaria collected by H.M.S. 

 ' Challenger,' by himself and by various friends ; the thousands of new 

 species which have been discovered opens up a new field for morphological 

 investigation ; the total number of forms described in this report amounts 



* Arch. Slav. Biol., iii. (1S87) pp. 33-49 (2 pis.). t IWd., pp. 157-76. 



X Comptes Rendus, civ. (1887) pp. 712-5. Cf. Ann. and Mag. Nat. Hist., xix. (1887) 

 pp. 328-4. 



§ Ann. and Mag. Nat. Hist., xix. (1887) pp. 439-41. 



U Reports of the Voyage of H.M.S. 'Challenger,' xl. (1887) 1803 pp., 140 pis. 



2 B 2 



