224 
was besides present. If we indicate the different cycles by letters 
the arrangement of the pairs was as follows (dm: directives). 
dm dm 
13423134243414342431342434143424341324345 . 
The two doser examined specimens were not provided with 
reproductive organs. 
Concerning other anatomical structures compare the diagnosis 
and Stuckey’s and Stephenson’s descriptions. 
Remarks. As far as 1 can see Stephenson’s Epiactis novo- 
zealandica is identical with the specimen described by Stuckey 
as Leiotealia Thompsoni. 1 cannot find any real difference between 
these species. The structure of the sphincter varies namely so 
much in the specimens that one might propose two species only 
on the base of the nature of the sphincter. 
Fam. Phelliidae. 
Genus Acraspedanthus nov. gen. 
Diagnosis. Pedal disc well developed. Column smooth with 
cinclides in the lower part. Sphincter mesogloeal, weak. Margin 
rather distinet, without fossa. Tentacles short, conical, hexamerously 
arranged, the outer tentacles considerably shorter than the inner. 
Longitudinal muscles of the tentacles and radial muscles of oral 
disc ectodermal. 2 well developed siphonoglyphes. Mesenteries more 
numerous in the distal part than in the proximal. Perfeet pairs of 
mesenteries (macroenemes) 6, fertile, with strong pennons, with 
filaments and acontia. imperfeet mesenteries (microenemes) sterile 
without filaments, pennons and acontia. Basilar muscles well devel¬ 
oped also on the stronger imperfeet mesenteries. Nematocysts of 
the acontia rather small. 
As this genus is provided with only 6 macroenemes, cinclides 
and acontia, it should be referred to the family Diadumenidae if we 
follow Stephenson. But as I have pointed out (1921 p. 21) 
this family is certainly heterogeneous and Diadumene itself not 
allied with the other genera. Pelocoetes, Phytocoetes and Mena be- 
long to XhQ Åthenaria, as far I can judge from Annandale’s and 
Stephenson’s descriptions. Comparing Acraspedanthus and Dia- 
