158 SUMMARY OF CURRENT RESEARCHES RELATING TO 



question of priority as between himself and Liihe, whose publication on 

 the same subject appeared at the same time. 



Forms of Cercocystis. * — Dr. E. von Daday discusses the forms 

 of Cercocystis found in fresh-water Entomostraca. What is a Cer- 

 cocystis ? The term was invented by E. Blanchard for bladder- 

 worms in which the scolex partially or wholly fills a proscolex cyst, 

 with a posterior or caudal process. In a Cysticercus the scolex 

 occupies only a small part ; in a Cysticercoid it almost fills the cyst ; in 

 a Cercocystis there is a tail. The first known Cercocystis larva was 

 described in 1872 by 0. von Linstow, but many are now known ; there 

 are about 27 different kinds in 21 Entomostracan hosts. Dr. von Daday 

 describes the general structure of these cysts, with the six layers in 

 their wall, and so on, and no less than eleven new forms from fresh- 

 water Entomostraca. 



Drepanidotsenia lanceolata Bloch.f — Dr. K. Wolffhiigel describes 

 :the anatomy of this tape-worm, in which the proglottides are extra- 

 ordinarily broad and short, the widtli being about ten times the length. 

 In regard to the male organs, the sacculus accessorius, present in D. 

 gracilis, is here absent. The cirrus-sheath resembles in its structure 

 that of D. fasciata, and is regarded by the author as of considerable 

 importance in classification. 



Development of Taenia serrata.f — G. Saint-Remy has obtained some 

 results which do not wholly agree with previous descriptions by Moniez 

 and by E. van Beneden. The shell is formed somewhat late ; no polar 

 bodies were seen. An early stage of segmentation shows two cells — 

 one small and formative, the other large and vitellophagous. The 

 latter divides, and one of its products re-divides, but the three take no 

 part in forming the embryo. The formative-cell divides into two, and 

 one of the daughter-cells becomes large and granular, seeming to accu- 

 mulate nutritive residues without taking active part in development. 

 The other daughter-cell proceeds to embryonic development, but here 

 again three elements are set apart to form the chitinous shell. 



New Nemertean.§ — Caroline B. Thompson describes as Carinoma 

 tremaphoros sp. n. a Nemertean found at Woods Holl, Mass. No 

 member of the genus has hitherto been described in North America. 

 The chief point of interest in the new species is the presence of twelve 

 dermal sense-organs on the head. Each is a circular pit containing 

 cells which bear long cilia. 



IncertaB Sedis. 



Development of Phoronis sabatieri.|| — Louis Eoule now publishes 

 the full text of his paper on this subject with plates and bibliography. 

 His general results were noted on the appearance of his paper in 

 abstract ; to the account there given a few sentences from the section 

 on the affinities of Phoronis may be added. The Actinotrocha is a 



* Zool. Jahrb., xiv. (1900) pp. 161-214 (3 pis.), 

 t Centralbl. Bakt., sxviii. (1900) pp. 49-56 (6 figs.). 

 j Comptes Rendus, cxxxii. (1901) pp. 43-5. 

 § Zool. Anzeig., xxiii. (1900) pp. 627-30 (1 fig.). 



I Ann. Sci. Nat. (Zool.), xi. (1900) pp. 51-249 (15 pla.). Cf. this Journal, 1900, 

 p. 677. 



