Stuckey. — A Revieiv of the New Zealand Actiniana. 381 



Stomoda'um. — The stomod;eiim is not commonly everted. Cross-sections 

 :.show it somewhat strongly folded, and with 2 siphonoglyphs. 



Sphincter Muscle. — This is wanting in the present species, but there is 

 at one place on the column (about one-third of the way down) a rather 

 stronger development of the endodermal muscles. This probably fulfils 

 the function of a sphincter. 



Mesenteries. — There are 2 pairs of directives. The normal number of 

 mesenteries appears to be 48 pairs, arranged in three cycles (12 + 12 + 24), 

 but the number is very variable. In one section I counted 56 pairs. In 

 this section, instead of 12 pairs of perfect mesenteries, there are 15 pairs 

 that reach the stomodfeum, and there is a superfluous development of the 

 mesenteries of the third cycle. Not only so, but the members of the same 



pair are sometimes unequal. Both these features 

 appear in the micrograph (Plate XXIII, fig. 1). 

 The musculature is very w^eak on all the mesen- 

 teries. The mesenterial filaments show the usual 

 structure. In the middle lobe of the " trefoil " 

 the mesogloea expands into a cup - shaped mass 

 (Plate XXIII, fig. 2). A. very curious feature is 

 noticed in this species. Before reaching the " tre- 

 foil " portion the mesentery divides into three, each 

 division ending in a trefoil. In many cases in my 

 sections it happened that only o»e of the three trefoils 

 Fig. 5. was cut truly transversely, the others being cut at 



various angles, so that the mesentery showed a pair 

 •of curious comblike structures and a median trefoil. It will be easily 

 seen that such a comblike appearance could be produced by cutting the 

 free edge of a filament more or less longitudinally. All doubt, however, 

 was removed by the discovery of several cases where the mesentery bore 

 three unmistakable trefoils (fig. 5). 



Distribution. — Of the genus — English Channel, Atlantic, Mediterranean, 

 Torres Strait, Abrohlos Islands (Delage and Herouard) ; also New Zealand. 

 Of the species — Cook Strait, Queen Charlotte Sound (Mr. Grant), Eobiu 

 Hood Bay (Mr. Skelley), Stewart Island (Miss E. Morrison). 



Genus Anemonia (Risso). 

 " Antheadre without acrorhagi." 



4. Anemonia olivacea (Hutton). 



This species was described by Hutton as Anthea olivacea. It is referred 

 to as Anemonia olivacea by Farquhar, who is probably right in so naming 

 it, the older generic name having precedence. 



Pedal-disc. — Ectoderm and eudoderm are thin. The mesogloea is thick 

 and fibrous, the fibres being arranged in wavy branching lines. Numerous 

 nuclei appear in the mesogloea. 



Column. — Smooth. Colour, olive-green. There are light longitudinal 

 lines near the base. The ectoderm and endoderm present the usual cha- 

 racters, and the mesogloea resembles that of the pedal-disc. It varies in 

 thickness, thick and thin places alternating in my sections. 



Tentacles. — About 50 in number, arranged in four cycles. In colour 

 they are pellucid-green, of the same shade as the body. There is a slight 

 constriction near the end, and the tip is darker in colour. They are conical 

 and slender, and their length is equal to the diameter of the oral disc. They 



