185 
mesenteries was in both specimens MBmb with some interruptions 
in the first specimen at the beginning of the fourth and eight quart- 
ettes (textfig. 10) in the second at the beginning of the seventh. 
In both specimens the hemisuici were rather long and in struct- 
ure like a simple filament. The structure of the filaments was in the 
b-mesenteries according to type 3, in the other metamesenteries 
according to type 2 in the upper, to 3 in the under part. The cras- 
pedonemes of the ciliated tract were of ordinary length, shorter or 
onger, and rather broad. The craspedion region in the m-filaments 
was weak and of the usual type as in Ceriantheopsis americanus 
and Botrucmdifer norvegicus. The reproductive region on the Ål¬ 
and m-mesenteries reach from the aboral end of the mesenteries 
to somewhat above the craspedonemes. The ovaries were well 
developed, the testes follicles very sparse. In most sections there 
were only ovaries, in others there were undoubtly spermatozoids. 
In most cases the testes were almost exhausted, with few sperma¬ 
tozoids, sometimes I have observed large testes follicles filled with 
spermatozoids. The species seems thus to be proterandrous herma- 
rodite^ Probably the same case obtains in P. flmbriatus (Com- 
pare Carigren Ceriantharia Ingolf-Exp. 1913, p. 53 and below 
under Isarachnanthus bandanensis). From this it appears that we 
must be very cautious in judging of the sex in Ceriantharia. 
he species reminds us in several characters of Pachycerianthus 
flmbriatus but according to Mc.Murrich’s in several respects 
imperfect description it is certainly distinet from this species As 
far I can understand, the ciliated streaks in the macroenemes (M- 
and m-mesenteries) are considerably shorter in flmbriatus than in 
Dheatus. Mc. Murrich (The Actinaria of the Siboga 1910. p. 20) 
wtes namely “in the macroenemes on the other hånd the trilobed 
portion of the filaments extends a mueh greater distance down the 
Tiesentery, as shown by the cross marks in textfigure II, the single- 
0 e portion being limited to its terminal part, which is almost 
■traight and in no case thrown out into the complicated folds and 
iranchings seen in the brachyenemes.« The single-lobed portion 
' the filaments occupying the greater part of the macroenemes 
s probably the craspedion region, which thus in flmbriatus is pre- 
ent also on the M-mesenteries. The distribution of the crasped- 
nemes seems also to be different from it in plicatus. According 
