181 
(cs. in the figures designed with a thick line), ihe greater part 
orms simple or ramificated craspedonemes {cc). Below the craspe- 
donernes there is a short craspedion region, the cnidoglandular tract 
IS absent. The ciliated tract of the m-mesenteries is considerablv 
shorter, especially the tract of the craspedonemes, which are more 
or less concentrated to a bunch. Below it a short cnidoglandular 
tract (cn) is developed. In the oldest m-mesenteries this tract is 
very short (as also in pt) and for the greater part only discern- 
1 e on sections, in the youngest m-mesenteries it is rather well 
developed but considerably weaker than in the metamesenteries B 
and b. The greater part of the free edge of the m-mesenteries is 
occupied by the craspedion region. The in contradistinction to ihe 
fertile M- and m-mesenteries sterile B- and b-mesenteries are of 
the usual structure, their ciliated tract at its end forms a small 
bunch of craspedonemes. 
Though irregularities in the arrangement and structure of the 
mesenteries are not uncommon in the Ceriantharia, I have not 
found so great anomalies in another specimen except in Cerianthus 
sohianus. Because of these anomalies it is difficult to decide with 
certainty, whether we have to do with a specimen of the genus 
Cerianthus or of Pachycerianthus. The comparatively short proto- 
mesenteries 2 and the sterility of these mesenteries in the third 
specimen speak for a Pachycerianthus, the fertility of the same 
mesenteries in the two other specimens and the structure of their 
filaments for a Cerianthus. As the protomesenteries show a more 
typical appearance in the second specimen (fig. 7) and on the left 
side in the first (fig. 6) I think that the species belongs to the 
genus Cerianthus. The relative shortness of the protomesenteries 2 
IS namely perhaps of less importance as these mesenteries are also 
short m Cerianthus valdiviae. Meanwhile, a renewed examination 
of richer material than at present available is desirable in order 
to confirm the real position of the species. 
In the figure 9 I have reproduced the most aboral part of the 
metamesentery Ms on the right side (fig. 6) (cs: ciliated tract, cc: 
craspedonemes of the ciliated tract, c: craspedion region). The cili¬ 
ated tract region is in the craspedonemes developed according to 
type 3. In the reproductive organs of the first specimen the testes 
form the greater part. The testes follicles and also the ova communic- 
