282 Transactions. — Zoology. 



and sub-innnately brauclied ; branchlets distant and alternate, both sub- 

 flexuous ; pale yellowish brown. 



Hydrotheca3 distant and alternate, proximal ones nearer to one another 

 than distal ones, variable in size, conical and sub-conical in form. 



Mouth tridentate, teeth obtuse, two teeth external and lateral, one tooth 

 internal (latter sometimes most acute and split so as to resemble tw^o teeth). 



Gonangia nearly sub-pedicellate, ovate, transversely ridged, ridges vary in 

 number and strength, distal ones generally strongest ; some truncated, others 

 with a neck ; necks two kinds, in one lips of mouth everted and neck 

 infundibuliform, in other neck simply tubular.* 



Habitat. — Attached to pebbles or fronds of seaweeds, Lyall Bay, North 

 Island j West Coast and East Coast of South Island (F. W. H. and M. C.) 

 Figs. 1—5. 



Sertularia suh-jnimata, Hutton. 



I believe this to be simply a dried variety of S. johnstonii. 



Sertularia delicatula, Hutton. 



Seems to me to be an uncommonly well defined variety of *S'. johnstonii, 

 but in my opinion has not sufficient differential characters for founding a 

 new species. 



It is very lax and delicate ; the hydrothecse are of the long and distant 

 variety. I failed to observe any toothing in the crowns of the gonangia. I 

 fancy this must have been the result of drying. 



Sertularia monilifera, Hutton. 



Captain Hut ton's description is an excellent one. 



" Hydrophyton strong, erect, dichotomously branched ; pale brown. 

 Hydro thecse alternate, crowded, tubular, the ujiper half slightly recurved ; 

 arranged in several rows on the main stems, but in two rows on the branches ; 

 aperture entire, or with two obtuse teeth. Gonangia ovate with strong 

 moniliform cross ribs, and with an entire edged tubular crown." 



The hydrothecae on main stem are adnate in their proximal half, while 

 those on branches are more free ; the former are more tubular than the latter. 



The appearances presented by those on main stem simulate somewhat the 

 generic characters of a Thuiarian. 



The strong moniliform cross ribs of the gonangia are numerous and very 

 close to one another. The general form of the gonangium is markedly ovate. 



Habitat. — Lyall Bay, on shells (Hutton). Figs. G and 7. 



* Gonangia, in most of my Timaru specimens, were truncated, the transverse ridges 

 were absent from proximal lialf of ^'onangia, the liydrothcca' largo and the teeth bohlly 

 obtuse. Jietwocn each ])air of liy<lr<>tht'c;i' is a sc'iiii-ol)li<juc joint, which, though faintly 

 Uiarked in the type, i« well marked in the varieties (see iig. 2). 



