The Actiniae «f the Plate CoUection. 251 



No. 121. Tumbes, near Talcalmano. 10 specimens. 

 128 a. Tumbes, Talcahuano. 6 specimens. 



169. Talcahuano. 3 specimens. 



? Talcahuano. 1 specimen. 



286 a. Punta arenas. 1 specimen. 



Dana in his report on the Zoophytes of the Wilkes exploring 

 expedition described two forms from the coast of South America 

 which had been named Adinia achates and Adinia reikulata by 

 Deatton and Coüthouy respectivel}^ The latter form has been 

 identified and re-described by R. Hertwig (1882), myself (1893) and 

 Carlgren (1899), and Hertwig, discovering* that it was a Paractid, 

 established for it the g-enus Anfholoba. A study of the specimens 

 contained in the present collection has convinced me that Couthouy's 

 species is really identical with Drayton's, and since the latter is 

 the first of the two described in Dana's report it should be taken 

 as the type. 



The diiferences between the two forms as shown in the ligures 

 in the Report are principally in size, coloration and the apparent 

 absence of a reticulation of the column wall in A. acJiates; the 

 difference in the number of tentacles is probably associated with 

 the difference in size and the difference in habitat, A. achates having 

 been obtained in thirty fathoms, becomes of little consequence as 

 individuals of A. reticulafa have been collected in similar depths, 

 specimens in the ^'Challenger" collection having been taken in forty- 

 five fathoms. The numerous individuals in the present collection 

 show considerable Variation both in coloration and in the distinctness 

 of the reticulation of the column wall and it is impossible to separate 

 anatomically the forms which resemble achates in these respects 

 from those that resemble rdiculaia. 



In the majority of the specimens the column is low in proportion 

 to the diameter, which increases rapidly from the limbus to the 

 margin. In extreme cases the form is almost saucer-like, but between 

 this condition and almost cylindrical forms there are almost all 

 gradations, and the two specimens from Iquique, which were adherent 

 to lamellibranch Shells were somewhat conical in form. The margin 

 is generally somewhat infolded, although the tentacles and disc are 

 as a rule visible, but in the more cylindrical forms the tentacles 

 raay be concealed although the infolding never quite reaches com- 

 pleteness. The reticulations of the surface of the column are always 



