ZOOLOGY AND BOTANY, MIOBOSOOPY, ETC. 235 



there appears a wart-like elevation whicli contains vacuoles ; this 

 increases in size, becomes constricted off from the mother-body, pushes 

 out delicate cilia, elongates and takes on the form of its parent. While 

 these changes have been going on the nucleus undergoes considerable 

 changes ; it elongates, becomes bowed, then constricted, and finally 

 breaks up into several pieces. The difference between the behaviour of 

 the nucleus in fission and gemmation is explained thus : in fission all the 

 developed external organula take part ; but they merely distribute 

 themselves into the two halves, and in each there is a kind of regeneration 

 vehich affects the nucleus ; in gemmation, on the other hand, the whole 

 body of the bud is newly formed from the substance of the parent, and 

 a closer relative connection between the nuclear substance and the body- 

 plasma becomes necessary. 



A more accurate account and figures than any yet published are 

 given of the red spots of Oxytricha rubra ; they are not sharply bounded 

 spheres, but merely consist of spherical aggregations of yellowish-red 

 granules. Three new species of Stichotricha, S. gracilis, S. saginata, 

 and S. horrida, are described. 



Of the Heterotricha Porpostoma (P. notatum) is a new genus which 

 is distinguished from Spirostoma by the lip-like thickenings near the 

 mouth. In dealing with the Peritricha a somewhat detailed account is 

 given of Zoothamnium CienJwwsJcii ; among the Holotricha Uronema 

 marinum is fully described, as is Soplitophrya fastigata sp. n. Tricho- 

 nema gracile is a new cilio-flagellate ; Salpingoeca procera and Monosiga 

 sinuosa new choanoflagellates ; while Urceolus ovatus, Anisonema multi- 

 costatum, and Diplomastix Dalilii are new flagellates. 



New or Little-known Infusoria.* — M. J. Kunstler has found an 

 infusorian about 60 /* long in the terminal part of the intestine of 

 Limulus. Its general appearance recalls that of Lophomonas hlat- 

 tarum, but the present species, which is not named, is not identical with 

 it. In the intestine of a Tipulid larva a number of Flagellata allied to 

 Bodo were found ; some of the creatures are from 8 to 10 /a long, and 

 the anterior flagella are remarkable for their length; others, which 

 appear to belong to a different species, have an elongated body and 

 execute spiral movements. The intestine of JffydropJiilus contains a 

 small Monocercomonas ; its form changes, and while some of these 

 changes do not alter the general configuration of the body, others are 

 true amoeboid movements which are localized at the hinder part of the 

 body ; at the anterior extremity there are four equal flagella, three of 

 which are connected at their base. Encystation has been observed. 

 The same insect has a small Amceha as a guest. The vagina of the cow 

 contains a Trichomonas, as does the intestine of the pig, and the mouth 

 of a man in ill-health. A very remarkable new ciliated infusorian has 

 been observed in the intestine of Periplaneta orientalis. 



New Infusorian. t— Prof. A. Giard gives the name of Pebrilla 

 (P. paguri) to a new genus of Infusorians found living on the hermit- 

 crab. It forms small colonies which are placed either in the vicinity 

 of the foot or at the posterior extremity of the abdomen, and which are 

 visible to the naked eye as black patches which retain their colour, 



* Comptes Eendus, cvii. (1888) pp. 953-5. 



t Bull. Sci. de la France et de la Belg., 1888, p. 316 (2 figs.). Ann. and Mas:. 

 Nat. Hist., iii. (1889) p. 69. t- v & / o 



R 2 



