104 



and silvery, on stone. Btiskia setigera n. sp. is figured. The occurrence of a 

 second species of Buskia has a positive interest as throwing further light on 

 a peculiar type of structure. Hitherto the genus has been represented by 

 Buskia nitens, Alder, a smaller form than the present, which is not uncommon 

 on the English coasts and ranges from the Mediterranean to the extreme 

 north (Davis Strait, Barents Sea, White Sea) and to the Queen Charlotte 

 Islands in the North Pacific. B. setigera is comparatively large ; and from the 

 suberect habit of the cell, the ventral aperture extending from the bottom (or 

 nearly so) to the top, is more apparent and more readily studied. The solid 

 or chitinous portion of the zoœcium forms a kind of carapace closed in be- 

 low by a membranous wall. The polypide stretches along the upper portions 

 of the cell immediately beneath the chitinous shell and issues at the top of 

 the oral area. The structure, so far as it can be determined in spirit-spe- 

 cimens, is extremely simple ; there seems to be no trace of a gizzard. In the 

 setose portion of the tentacular sheath there is an interesting pecxdiarity. The 

 setae, before expanding, instead of being packed together so as to form a 

 straight pencil, are seen to be subspirally arranged, some tending to one 

 side, some to the other, and bear some resemblance to loosely twisted strands 

 in a cord. As the tentacular corona moves upward and presses upon the base 

 of the operculum, the setje disentangle themselves and expand into the usual 

 funnel-shaped figure. The seta? with the reversible portion of the sheath from 

 which they rise equal the cell in length. The four setose appendages placed 

 round the upper portion of the cell-margin form a very conspicuous and 

 striking feature. "WTien the polypide is exserted, they are thrown back and 

 stand out from the cell ; when it withdraws they are brought together and 

 project at the summit. The tubular adherent processes given ofiF from the 

 lower part of the cell correspond with the spines round the base of the zoœ- 

 cium in B. niteiis. The cells are developed in large numbers on the creeping 

 stem, and the habit of growth is luxuriant. Membranopora favus, M. rnargi- 

 nella, Lepralia robusta. Porelìa malleolus with others are among the new species 

 fully diagnosed. Of Hydroids, Obelia Andersoni, and 0. bifurca are new to 

 science ; the latter probably allied to 0. bicnspidata, Clarke, known from the 

 Thimble Islands, coast of New England. — J. M urie. 



IV. Personal-Notizen. 



Herr Dr. G. Baur, New-Haven, Conn, wird sich im Februar auf eine 

 längere Studienreise nach Europa begeben. Seine Adresse während seines 

 Aufenthaltes in Europa ist : 32 Heß-Str. München. 



Necrolog. 



Am 29. November 1886 starb in Wien Johann von Hornig. Bekannt 

 als Lepidopterolog hat er namentlich der Biologie der Schmetterlinge eine 

 Anzahl eingehender Artikel gewidmet. 



Notiz. 



Tropische Landplanarien, bis 30 cm lang (Bipalinen sp. nach Hofrath 

 Bütschli), versendet lebend oder conservirt zu 5 — S Jl der botanische Garten 

 in Heidelberg-, 



Druck von Breitkopf & Härtel in Leipzig. 



