ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 653 



Eolliker in a medusoid (Stomobrachium mirabile), by Allman in a hydroid 

 (perhaps a species of Obelia) which he called Schizocladium mirabile, 

 and by Murbach in a free hydroid — Hippolyius peregrinus. Billard has 

 found scissiparity in Obelia flabellata Hincks, 0. genicidata L., Lepto- 

 scypltus tenuis Allman, and Campanularia angulata Hincks. This mode 

 of multiplication secures rapid propagation in the species of Obelia and 

 Campanularia above-mentioned. 



Asexual Reproduction in Hydrozoa.* — Armand Billard gives the 

 name of Stolonisation to a method of reproduction found in littoral 

 Hydroids, notably in the species of Obelia. In it the hydroclades, or 

 certain branches of the colony, are converted into stolons, which spread 

 rapidly over the surface, and give rise to buds from which new colonies 

 develop. This method of reproduction occurs usually in shallow-water 

 forms, and is replaced in deep-water species by " scissiparity." 



Variations in Hydromedusae.f — C. W. Hargitt reports on some of 

 his studies, especially on species of Pennaria and Gonionemus. The 

 medusoid of Pennaria seems to be degenerating ; in many specimens the 

 marginal canal is wholly atrophied, and in some cases the radials have 

 been more or less suppressed. Sometimes the medusoids are not liberated. 

 Of 500 specimens of Gonionemus only 15 showed abnormal or unusual 

 genital features, but there was considerable variation in both the number 

 and arrangement of the tentacles. There was most marked variation in 

 the radial canals, from one with two to several with six. Threes and 

 fives were also found. 



Limnocodium sowerbii at Lyon.J — C. Vaney and A. Conte report 

 that, in June 1901, a large number of medusoids appeared in the Victoria 

 Begia tank at Lyon, and that these were identified as the Limnocodium 

 sowerbii described by Allman and Bay Lankester from a similar tank at 

 Regent's Park, London. They figure and describe the nematocysts and 

 the spermatozoa, and in so doing add a little to previous accounts of this 

 interesting fresh-water medusoid. 



Post-Embryonic Development of Aurelia aurita.§ — 0. Friedemann 

 has endeavoured to come to some decision regarding those points in the 

 development of Aurelia which have been disputed for a score of years, 

 (a) The author could not verify what Goette described in the 8-tentacled 

 Scyphistoma — an ectodermic gullet. (6) The four gastric pouches appear 

 in entire independence of the gullet, (e) The tentacles increase in the 

 series 4, 8, 16, 24 ; forms with 12 or 20 are intermediate phases, (d) 

 There is no lumen or funnel in the septal muscle, (e) There is a 

 funnel, however, though it does not arise at the time or place described 

 by Goette. For Goette's term Septaltrichter the author proposes to 

 substitute the term Peristomtriclder, since the organ neither lies in the 

 muscle nor gives origin to the subgenital cavity, but merely represents 

 a transitory ectodermic proliferation from the peristome into the taeniola. 



Attachment of Young Sea-Anemones to an Adult.|] — Dr. F. Immer- 

 mann describes specimens of a species of Epiactis (probably E.prolifera), 



* Comptes Eendus, cxxxiii. (1901) pp. 521-4. 



t Proc. Amer. Ass. Adv. Sci., 49th Meeting, 1900, pp. 203-6. 



X Zoo]. Anzeig., xxiv. (1901) pp. 533-4 (2 figs.). § Tom. cit., pp. 567-S. 



|) Zool. Jahrb.. xiv. (1901) pp. 558-64 (1 pi ). 



