251 
Anatomical description. As there is only one small spec- 
imen present in the collection I cannot give a perfect description 
of the anatomy. 
The ectoderm of the column is high but considerably thinner 
than the mesogloea, which is fibrillar and contains numerous small 
protoplasma-poor cells. The circular muscles of the column are weak, 
43 
Fig. 42, 43. Tlioe neozelanica. Transverse section of sphincter (fig. 42) 
and of a mesentery of the first cycle (?) (fig. 43). 
the Sphincter, on the other hånd, very strong. It is rather short, 
probably in connection with a contraction, broad and occupies al¬ 
most the whole breadth of the mesogloea in its upper part but 
diminishes, rather abruptly, downwards. The meshes are small, 
rather close and show a tendency to stratification (textfig. 42). The 
longitudinal muscles of the tentacles and radial muscles of the oral 
disc are ectodermal and ordinarily developed. 
The mesenteries are pentamerously but somewhat irregularly 
arranged. The two pairs of directives were symmetrically situated. 
