258 Transactions. — Zoology. 



Genus Thuiaria, Fleming. 



Hydrosoma variously branched. Hydrothecse biserial, adnate, or imbedded 

 in the substance of the stem and branches. 



Thutaeia articulata. 

 aS'. articulata, Pall., Elencli. 137*? T. articulata, Johnst., "Brit. Zooph.," p. 84 % 



Hydrosoma thick, erect, pinnately branched ; branches alternate ; pale 

 brown. Hydrothecse alternate, ovato-tubular, slightly curved ; aperture 

 truncated, entire. Ovarian cells — ? not seen. 



Lyall Bay. (F.W.H.) A single specimen only. 



Thuiaria zealandica. 



T. zealandica, Gray, I.e., II. 214. 



" Pale brown, erect, branches oppositely pinnate. Hydro thecse small, 

 exactly opposite, triangular ; aperture truncated, with a small central tooth." 

 New Zealand. (Dr. Sinclair.) I have seen no specimens. 



Genus Antennularia, Lamark. 



Hydrosoma variously branched j branches clothed with hair-like verti- 

 cillate branchlets. Hydrothecse small, sessile, campanulate, unilateral. 



Antennularia antennina. 



S. antennina, Linn., Syst. 1310. A. antennina, Johnst., " Brit. Zooph.," p. 86. 



Hydrosoma strong, erect, sub-pinnately branched ; branchlets numerous. 

 Hydrothecse with intermediate cellules. Ov^arian cells — 1 

 Lyall Bay. (F.W.H.) A single specimen only. 



Genus Plumularia, Lamark. 



Hydrosoma simple or branched, the branches pinnate ; hydrothecse small, 

 sessile, unilateral. 



Plumularia pennatula. 

 S. pennatula, Ell. & Sol., Zooph., 56. P.pennatula, Johnst., "Brit. Zooph., "p. 94. 



Hydrosoma simple, or sparingly branched, formed by a single tube ; 

 branches alternately closely pinnate ; brown or reddish -brown. Hydrothecse 

 approximated, seated in the axil of a long incurved spine ; aperture unequally 

 crenated. Ovarian cells large, sub-cylindrical, stalked, with numerous trans- 

 verse strongly denticulated ribs, situated on the inner side of the branches. 



Lyall Bay. (F.W.H.) Common. 



