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branipora. Whilst the side-walls in the majority of the Flustridae have uniporous 

 rosette-plates, we find multiporous ones in the three species Fl. foliacea, Fl. car- 

 basea and Fl. abyssicola, and it might be considered as part of the evidence for 

 the systematic importance of the rosette-plates, that none of these three species 

 have the cap- or cup-shaped ooecia, which are common in the family. Only in 

 Fl. foliacea (PI. I, figs. 8 a— 8 b) we can find ocecia of a very peculiar egg-shape, 

 which must have arisen in this way, that the distal wall has simultaneously 

 formed an upper as well as a lower cap- or cup-shaped expansion. The peculiar 

 apparatus for the ejection of the larvae, which Jul lien has shown in Fl. abyssi- 

 cola, also seems to suggest a very distant relationship to the other Flustridae, but 

 for the rest, we shall not here enter further into these questions. In many cases 

 the proximal portion of the ooecia is covered by a low cryptocyst-belt (PI. I, 

 figs. 2 b, 3 a, 6 a, 7 c), which originally arises out of two lateral halves which 

 finally fuse together. It increases in height with age and may in time in Fl. 

 flustroides (PI. I, fig. 4 a) completely cover the ocEcium. On the other hand, there 

 is in Fl. securifrons a pair of flat, obliquely placed cryptocyst-processes distally 

 to the zooecial operculum (PI. I, figs. 5 a— 5 b, d. w.). In all the species, which 

 occur in free colonies, their margin is formed by kenozooecia ,which for the rest 

 can appear in very different ways; sometimes (Fl. foliacea, Fl. membranaceo- 

 truncata, Fl. securifrons) as chambers of a similar form and structure as the other 

 zooecia, but without an operculum, sometimes {Fl. biseriata, Fl. cribriformis) as 

 narrow, tube-shaped marginal ridges, which here and there show internal sepa- 

 rating walls. While such modified marginal individuals appear at several places 

 within the division Ascophora, for instance in Onchoporella bombycina and Micro- 

 porella flabellaris, I have not been able to find them in any members of the 

 families Bicellariidae or Scrupocellariidae, and their presence or absence seems thus 

 in doubtful cases to be available as a distinguishing character for these families. 

 I must thus emphasize the fact, that I have not been able to find such marginal 

 zocecia in any of the above-mentioned species which up to the present have been 

 incorrectly referred to the Flustridae, and that their appearance has nothing to 

 do with the number of rows of zooecia in the colony, is evident from the fact, 

 that on the one hand they are lacking in the species mentioned, but on the other 

 hand appear in Fl. biseriata, the true zooecia of which are two-rowed. 



Jul lien has made a beginning with the splitting up of the old Flustra genus 

 by founding the genus Sarsiflustra, and I will here propose the setting up of 4 

 other genera (or subgenera?), of which one must keep the name Flustra, as it 

 will contain the species Fl. foliacea, on which the genus was originally based. 

 As we thus have no name for the' rest of the species, which not yet have been 



