656 SUMMARY OF CURRENT RESEARCHES RELATING TO 



of the old cells throughout the entire piece, as in the normally growing 

 animal, and that the tentacles are formed from old cells and from cells 

 that have arisen by division of the already differentiated cells of the old 

 part. 



Japanese Scyphomedusse.* — Kamakichi Kishinouye has in the past 

 few years been studying the Scyphomedusse of Japanese waters, and has 

 come to know 22 species, most of which are new to science. Some are 

 very remarkable. 



The new family Stenoscyphidae (among the Stauromedusae) is estab- 

 lished for Stenoscyphus g.n.- — a medusa which stands between Tesseridae 

 and Lucernaridaa, closely allied to Depastridaa on the one hand and to 

 Haliclystidae on the other ; it has a four-chambered peduncle and eight 

 separate gonads. It hangs down from the fronds of Sargassum, able to 

 detach itself, but without swimming power. As the body has adhesive 

 apparatus at both its extremities, it can effect a locomotion very much 

 like that of a leech. 



Very interesting, also, is Schizodiscus g.n. — a Lucernarid without 

 mesogonial pouches and without adhesive anchors. The Pelagidae are 

 enriched by Kuragea g.n., the Rhizostomae (Cepheidae) by Microstylus g.n., 

 and Perirhiza g.n. 



Porifera. 



Studies on Hexactinellids.f — Isao Ijima has studied the old types 

 of Corbitella speciosa Quoy Gairaard, Heterotella corbicula Bowerbank, and 

 Eadictyum elegans Marshall. 



Gray's genera Corbitella and Heierotella should be kept up as distinct, 

 the former to comprise not only Quoy and Gaimard's species C. speciosa, 

 but also Marshall's Eudidyum elegans as well as F. E. Schulze's Tsegeria 

 pulchra, and the latter to stand represented by the single original species 

 H. corbicula of Bowerbank. 



Ijima gives a definition of the Euplectellid subfamily Corbitellinae, 

 and diagnoses of the species mentioned above. 



Protozoa. 



Variations of Nodosaria scalaris.J — A. Silvestri discusses, particu- 

 larly from the systematic side, the occurrence of numerous aberrant 

 forms of this Foraminifer, which cannot be regarded as accidental or 

 teratological anomalies, but seem to be quite definite variations from the 

 type. 



Dimorphism of Foraminifera.§ — A. Silvestri discusses the marked 

 dimorphism of Siphogenerina columellaris, which occurs in a rarer micro- 

 spheric and a commoner megalospheric form. 



Discoloration of the Sea by Dinoflagellata. || — H. B. Torrey de- 

 scribes the occurrence of enormous swarms of a species of Gonyaulax at 

 San Pedro, on the Californian coast. The water was red (muddy ver- 



* Journ. Coll. Sci. Univ. Tokyo, xvii. (1902) article 7, 17 pp. and 2 pis. 



t Tom. cit., article 9. 34 pp. and 1 pi. 



X Atti Pont. Accad. Rom. Nuovi Lincei, lv. (1902) pp. 49-58. 



§ Tom. cit.. pp. 101-4 (1 fig.). 



|| Amer. Nat., xxxvi. (1902) pp. 187-92 (3 figs.). 





