372 FUNAFUTI ATOLL. 



Antipatharia (Antipathella brooki), and two to the order Actin- 

 aria (Zoanthus funafutiensis, and Gemmaria willeyi). The re- 

 maining three are Palythoa howesii, Hadd. & Shack. ; P. kochii, 

 Hadd. & Shack. ; and P. ccesia, Dana. 



The Actinaria have been worked out in conjunction with Mr. 

 J. P. Hill, of the Sydney University, who kindly cut the sections 

 and examined the internal structure; he is, therefore, jointly with 

 myself, responsible for this portion of the publication. 



The Vermes are represented by three species of Polychceta, two 

 species of Perichwta, and five species of Gephyrea. They are as 

 follows : Eurythoii complanata, Pallas ; E.pacifica, var. levukcensis, 

 Mclntosh ; Phyllodoce, sp. ; Perichceta grubei, Rosa, P. sp. ; Phy- 

 mosoma nigrescens, Keferst ; P. scoleps, Sel. & de Mann; Aspido- 

 siphon elegans, Cham. & Eysenn. ; A. sleenstrupii, Diesing ; and 

 Gleosiphon aspergillum, Quartref . 



CLASS HYDROZOA. 



Order HYDROMEDTJSJE. 



FAMILY SERTULARID^E. 



THUIARIA DIVERGENS, sp. nov. 



(Plate xxiii., figs. 1, 2, 3.) 



Trophosome : Hydrocaulus simple, indistinctly and irregularly 

 jointed, strongly fascicled below, becoming monosiphonic distally; 

 height from 5 to 6 cm. Hydrothecae alternate, one opposite the 

 base of each pinna, and two on the same side, one of which is 

 situated in the axil above and the other about O2 mm. below. 

 The base of each of the cauline hydrothecse possesses a thick 

 chintinous process which extends across the internal cavity of the 

 stem and becomes united with the opposite wall. 



Pinnae alternate, from 1 to 2 cm. in length and about 2 mm. 

 apart ; joints transverse, very irregular ; one or two pairs of 

 hydrothecse to an internode, frequently two or more internodes 

 without hydrothecse on each pinna. 



Hydrothecae 0'7 mm. in height, - 3 mm. in broadest diameter, 

 diminishing to 0'2 at the apex; proximally they are opposite, 

 distally they become subalternate, they are adnate for about one- 

 third or one-half of their height, but not in contact with each 

 other at the back ; the free portion is abruptly bent outwards ; 

 the outline above is horizontal or slightly ascending, and evenly 

 curved below ; the terminal third exhibits numerous lines of 

 growth. Aperture operculate, subquadrate, with four angles, one 

 pair in a line with the axis, the other lateral. 



