ZOOLOaY AND BOTANY, MICROSCOPY, ETC. 401 



massive as in almost all Ciliata and Suctoria ; the paranuclei, which 

 are probably confined to the Ciliata, are also formed on this type. The 

 process of nuclear division consists in the aggregation of the chromatin 

 mass into a form which is capable of exact division by equatorial 

 constriction. This process is best known, and is most clearly seen in 

 the ciliated Infusoria, when the chromatic substance becomes arranged 

 into filaments of equal length, which are broken through in the 

 middle on the division of the nucleus. 



Nuclear division in the Protozoa is a much simpler matter than in 

 the Metazoa, where the arrangement of the chromatic substance is 

 much more complicated ; there too the mechanism is quite different, 

 for there is not a division of the nucleus in toto, but a breaking up of 

 the nuclear substances followed by their separation. At the same 

 time, Gruber is of opinion that among the Metazoa there are to be 

 found nuclei which are formed on the Protozoic type, and in which 

 division is effected in the same mode as in the Protozoa. 



New Infusoria.* — C. S. DoUey describes a Cilio-flagellate Infu- 

 sorian in Baltimore drinking water apparently constituting an inter- 

 mediate species or variety between Peridinium tabulatum and P. apicu- 

 latum. 



A. 0. Stokes describes f a new Choano-flagellate, Codosiga florea, 

 found on dead and decaying leaflets of Myriophyllum from an aquarium. 



Miss S. G. Foulke describes J anew Trachelius {T. Leidyi), the 

 second true species of the genus, the principal difference between it 

 and T. ovum being that while the latter is egg-shaped, the new form 

 is globosely convex dorsally, but flattened with a deep indentation 

 ventrally. 



Stentor C8eruleus.§ — " J. W." claims to have discovered that " the 

 blue Stentor not only takes small food-particles through the oral 

 aperture but that it has the means of projecting portions of its 

 protoplasm to serve the purpose of capturing its prey, for the rotifers 

 and Paramecia under observation were slowly drawn into the body 

 still surrounded by a transparent envelope and were gradually 

 absorbed. Sometimes two or more rotifers were seen together in 

 the same Stentor undergoing absorption. All movements of the prey 

 ceased when caught by the rhizopod-like extension of the Stentor." 



CMorophyll-corpuscies of some Infusoria. || — By way of supple- 

 ment to Prof. E. Eay Lankester's paper on a form of chlorophyll- 

 corpuscle present in Spongilla and Hydra viridis,'\ Miss J. A. Sallitt 

 describes the chlorophyll-corpuscles in several green forms of in- 

 fusoria. 



In Paramecium hursaria the corpuscles are very numerous, and are 

 scattered through the endoplasm of the animal. They are usually 

 spherical and vary in size from *0025 mm. to '006 mm. in diameter. 



* Johns Hopkins Univ. Circ, iii. (1884) pp. 60-1. 

 t Amer. Mon. Micr. Journ., v. (1884) pp. 43-5 (1 fig.). 

 X Proc. Acad. Nat. Sci. Philad., 1884, pp. 51-2. 

 § Amer. Mon. Micr. Journ., v. (1884) pp. 50-1. 

 II Quart. Journ. Micr. Sci., xxiv. (1S84) pp. 165-70 (2 pis.). 

 i See this Journal, ii. (1882) pp. 322-4. 

 Ser. 2.— Vol. IV. 2 E 



