Stuckey. — Actinians from the Kermadec Islands. 



133 



Tentacles. — These are short, and in two series, about 40 in each series. 



Mesenteries. — In the only specimen that I sectioned the mesenteries 

 presented the usual brachycnemic arrangement. There were a pair of 

 perfect and a pair of imperfect directives. In the sulco-lateral portion I 

 found 14 pairs of mesenteries, and in the sulculo -lateral portion 2 pairs. 

 The mesenterial filaments are of the form typical of the family. 



Gonads. — -None were found in the specimen sectioned. 



Isaurus fuscus n. sp. 



Of this species the collector says : " Pale brown. Noticed only in rock- 

 pools between tide-marks, Fishing Rock, Sunday Island." 



There is only one specimen in the collection, and its colour in the 

 preserved state is creamy- white. 



Form. — The base of the column is adherent, and follows the irregularities 

 of the rock to which it is attached. The body is cylindrical, and trans- 

 versely furrowed in contraction. The specimen had become flattened and 

 misshapen. The oral disc and tentacles were strongly infolded. 



Dimensions. — -Height, 22mm.; long diameter of column, 10mm.; 

 short diameter of column, 5 mm. 



Body-wall. — -The body-wall is thick, and under the thin cuticle there is 

 a subcuticular or peripheral layer of mesogloea, which is connected with 

 the general mesogloea by strands which cross the ectoderm. The mesogloea 

 is thick, and contains many lacunae and cell-islets. The endoderm is well 

 developed. There are large endodermal and ectodermal bays. 



Tentacles. — These could not be seen in the contracted state. 



Mesenteries. — -These present the usual brachycnemic condition, and 

 were 44 in number. The brachycnemic couples were the twelfth and 

 thirteenth from the perfect directives on one side, and the sixteenth and 

 seventeen on the other side. The arrangement of the mesenteries with 

 respect to the siphonoglyph is shown in the following diagram : — 



Sphincter Muscle. — There is a very strong mesogloeal sphincter. The 

 cavities are closely lined with cells, and the mesogloea in the region of the 

 sphincter has a fibrous appearance quite different from that of the other 

 part of the body-wall. 



Epizoanthus oliveri n. sp. 



The collector's note on this species is : " Plentiful among a close-growing 

 coralline alga in rock-pools between tide-marks, Fishing Rock, Sunday 

 Island." 



I have placed this species provisionally in the genus Epizoanthus, all 

 recognizable features pointing to the correctness of this classification. The 

 body-wall is so strongly encrusted with sand and other hard bodies that it 

 is impossible to make anything but fragmentary sections. 



Form. — There is an encrusting coenenchyme, on which the polyps are 

 closely set. Both coenenchyme and body- wall are encrusted with sand, &c 



