ZOOLOGY AND BOTANY. MICROSCOPY. ETC. 561 



forms in the collection are Glavularia franMiniana Roule, Alcyonium 

 pcessleri ^laj, Ceratoisis {Frimnoisis) deUcatula sp. n., Ceratoisls {Prim- 

 noisis) antarctica {= Isis antarctica Studer), TkouareUa antarctica, and 

 Umbellula carpenter i Kolliker, the only Pennatuhd. 



Plumulariidse of Lamarck's Collection in Paris.* — A. Billard has 

 revised this collection, and gives in the present paper an acconnt of the 

 donbtf ul or insufficiently described specimens of the family Plumulariidas. 



Morphology of Coeloplana.f — J. F. Abbott provides a welcome 

 addition to our knowledge of this organism. His facts are derived 

 chiefly from a study of a Japanese form of Kowalevsky's CoeJojiJana. 

 It cannot swim either as a Ctenophore, or by means of the flattened 

 skirt of the body, as some Planarians do. In the aquarium it usually 

 adhered to the surface film by the ventral face of its body like a Plana- 

 rian. It does not crawl in any one direction more than another ; indeed, 

 upon appropriate peripheral stimuli two sides of the animal may be made 

 to progress in opposite directions. The animal is very fully described, 

 and the conclusion is drawn that the weight of the morphological 

 evidence supports the assumption that CceJoplana is a very highly 

 specialised Ctenophore, related to or derived from the Cydippida. But 

 its true position and relationship with other groups cannot be decided 

 until its development has been worked out. Material for this has yet 

 to be obtained. 



Porifera. 



Antarctic Sponges. J — R. Kirkpatrick reports on the ' Discovery ' 

 collection of sponges, which includes 4 species of Tetractinellids, 

 •48 Monaxonellids, and 24 Calcarea. No horny sponges were found. 

 Three new genera of Hexactinellids (Ptossellidte) and 8 new species 

 are described. 



Protozoa. 



Antarctic Tintinnida6.§ — H. Laackmann describes briefly the new 

 species of Tintinnidse obtained by the German South Polar Expedition. 

 Of these there are 14 ; of known members of this family only one species 

 is represented in the collection, Tintinnus acuminatus (var. secata ?) This 

 group, next to Diatoms, constitutes the most important constituent of 

 Antarctic Plankton. 



Mitochondria and Sphasroplasts of Infusoria. ||—E. Faure-Fremiet 

 finds, by the aid of special cytological methods, that certain spherular 

 elements in the cytoplasm of Protozoa are what he terms individuaHsed 

 organites — constituent parts of the cell on the same level with the nuclei, 

 centrosomes, and leucites. These he terms sphferoplasts. Infusoria 

 possess a mitochondrial apparatus made up of sphferoplasts, constant 

 cellular organs, individuaUsed and multiplying by bipartition at the 

 moment of division of the protoplasmic body. They are very distinct 

 from the ergastoplasmic forms, which are temporary, as may be observed. 



* Ann. Sci. Nat. Zool., v. (1907) pp. 319-35 (5 figs.). 



t Zool. Jahrb. Abt. Anat., xxiv. (1907) pp. 41-70 (3 pis. and 7 figs.). 



X National Antarctic Expedition, 1907. Porifera, 25 pp., 7 pis. 



§ Zool. Anzeig., xxxi. (1907) pp. 235-9 (13 figs.). 



II C.R Soc. Biol. Paris, Ixii. (1907) pp. 528-5. 



