The Actiniae of the Plate CoUection. 279 



of the sections made any determination of its form impossible. 

 Cinclides were undoubtedly present but no deflnite Information as 

 to their distribution or arrangement could be obtained. 



The stomatodaeum was longitudinally ridged and possessed two 

 well developed siphonoglyphs. The mesenteries were arranged 

 octamerously in two cycles, only the first of which, containing two 

 pairs of directives, was perfect. Longitudinal muscle pennons occured 

 on the perfect mesenteries and the parieto-basilars, though weak, 

 formed a distinct fold. Acontia were present, but no traces of re- 

 productive cells could be discovered. 



It is by no means certain that this form is referable to the 

 genus Aiptasia, and the imperfection of the data which could be 

 obtained from the Single specimen seems to render the bestowal of 

 a specific name inadvisable. 



Subfamily FhelUinae Veeeill, 1868, 



Sagartiidae with a tliick column wall in which a capitulum and 

 scapus are recognizable ; no cinclides nor Verrucae; with the mesen- 

 teries of the first cycle alone perfect. 



Genus Homiathia Gosse. 



Hormathia Gosse, 1860. 

 Chondractinio, Lütken, 1861. 

 Chiionactis Fischee, 1874. 



PMKinae with the scapus more or less tuberculate; capitulum 

 smooth; tentacles not enlarged at the base. 



20. Hormathia exlex n, sx>. 



No. 240. Calbuco. 2 specimens. 



Of the two individuals of this species one was contracted to an 

 almost globular form, the capitulum and upper part of the column 

 being completely infolded. The other one (Fig. 70), on the contrary, 

 was fully expanded and was consequently selected for examination, 

 the description which follows being based upon it, except when 

 otherwise stated. 



The base is of the adherent form and of about the same dia- 

 meter as the column or, as in the contracted form, slightly smaller 

 and with its edges slightly incurved so that it is somewhat concave. 

 The column is practically cylindrical and in its lower four-fifths is 



Zool. Jahrb., Supplement. Bd. VI. (Fauna Chilensis. Bd. III.) Heft 2. 19 



