244 
often somewhat curved, partly 10 —14 x 2 partly 12—14 x l 
those of the actinopharynx 22—24 x 2,5 /f, those of the acontia 
partly 43—51 (56) x 5—6 (.i, partly 26—33 x 2—3 broader in 
the basal end, partly 17—21 x 1,5 Spirocysts of the tentacles 
12 X 1 — 17x2 . 
• Col o u r? 
Dimensions of one of the largest specimens: length and 
breadth 0,5 cm. All other specimens, except one, smaller. 
Occurrence. Bay of Islands, 7 specimens. (The same locality, 
teste Stephenson). 
Exterior aspect. The specimens agree in 
their exterior with the description given by Ste¬ 
phenson 1918. All my specimens seem, how- 
ever, to be in a State of regeneration after longi¬ 
tudinal fission. One side is mostly shorter than the 
other (Textfig. 38) and the regenerating zone is often 
very distinet in the short side. There is, therefore, 
no doubt that the specimen multiplies by longitudinal 
fission. Possibly some of S teph en so n’s specimens 
Fig.38. D/adumene are also in a State of fission (compare PI. 1 fig. 3 
in Stephenson’s paper). The tentacles were in 
the two largest specimens 48 resp. about 70. In the 
two largest examined specimens I observed only a single, well 
developed siphonoglyphe, probably arisen in connection with the 
asexual reproduction. 
Anatomical description. My examination of the anatomy 
of this species agrees well with that described by Stephenson. 
Concerning the nematocysts (compare the diagnosis) it is possible, 
that there are transition forms between the two kinds in the column 
as also between the smaller nematocysts of the tentacles. It is also 
uncertain, if the nematocysts 26 — 33 x 2—3 really belong to the 
acontia. I have namely not been able to isolate the acontia, the 
maceration preparations contained also parts of the filaments. The 
smallest nematocysts in the acontia I have only observed in sections. 
The specimens were not well preserved and the actinopharynx 
often evaginated. In one specimen, sectioned in its whole length, 
there were 7 perfeet pairs of mesenteries, of which, as far I can see, 
only a single directive pair. Also in another specimen I observed 
minima. 
Magnif. ^o/i. 
