ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 43 



peptone, but evidently a protoproteose, with traces of sugar. In 

 acephalous cysts of T. echinococcus he found deuteroproteose and sugar. 

 A non-parasitic pulmouary cyst contained sugar, traces of proteose, and 

 a considerable quantity of urea. 



New Cestodes.* — Prof. St. von Eatz describes from a species of 

 Yaranus three new tapeworms, — Ichthyotsenia hiroi, I. saccifera, and 

 Taenia mychocepJiala ; the special interest of the first two being that they 

 add to the small list of cases where fish-tapeworms have been found in 

 higher Vertebrates. 



Incertse Sedis. 



Double Forms of Loxosoma-t — Mr. W. S. Nickerson describes five 

 double monsters, united side to side and with a common foot, and in- 

 terprets them as due to the incomplete separation of two masses of 

 germinal tissue, destined under normal conditions to give rise to two 

 distinct buds. 



Echinoderrna. 



Antarctic Edmunds and Ophiuroids.J — Prof. E. Kcehler makes a 

 preliminary report on the Echinoids and Ophiuroids of the Belgian 

 Antarctic expedition. They exhibit a very distinct facies " without any 

 analogy with arctic and sub-arctic or with sub-antarctic forms." In 

 short, the results are quite opposed to the theory of bipolarity. 



Genital Organ of Larval Antedon.§ — Achille Eusso finds that the 

 primary genital cells of Antedon rosacea are not, as is generally supposed, 

 formed by a proliferation of the " genital stolon,''' but first appear in a 

 mesenteric structure placed in the interradius C D. These primary 

 sexual elements have a very brief existence, and have disappeared before 

 the arms begin to bifurcate. The organ which becomes the " genital 

 stolon" of the adult appears in the interradius A B, and completely 

 replaces the earlier structure. These facts the author regards as being 

 of great importance in connection with problems of Echinoderm mor- 

 phology, and especially in regard to the affinities of Crinoids, Cystoidea, 

 and Holothurians. Thus, in Holothurians the primary genital cells 

 arise in the mesentery of interradius C D, the organ being apparently 

 homologous with that of the larval Antedon. Again, in the Holothurian 

 the formation of the genital organ is accompanied by the formation of 

 the aboral lacuna and sinus, structures which are also indicated in the 

 larval Antedon, though they atrophy with the primary genital organ. 

 Further, the author believes that the larval genital organ of Antedon is 

 homologous with that of the Cystoidea, which was also, as is seen from 

 its aperture, placed in the interradius C D. 



Coelentera. 



Mesenterial Filaments. ||— Prof. J. Playfair M'Murrich has studied 

 these in various Actinians, but especially in Zoantlms sociaius Ellis. In 

 adults there is no histological continuity between the glandular streaks 



* Centralbl. Bakt., l ,e Abt., xxviii. (1900) pp. 657-60. 



t Amer. Nat., xxxiv. (1900) pp. 891-5 (6 figs.). 



j Comptes Retains, cxxxi. (1900) pp. 1010-12. 



§ Atti (Rend.) R. Accad. Lincei, ix. (1900) pp. 361-6 (2 figs). 



|i Trans. Canadian Inst., vi. (1899) pp. 3S7-404 (11 figs.). 



